US 6157823

I'll research US patent 6157823 directly. Let me run targeted searches.

Let me search specifically for any 2026 Federal Circuit activity and confirm the bibliographic record.

US 6,157,823 B1 — "Security cellular telecommunications system"

Sourcing / confidence note

I could not query USPTO PatentCenter or the CAFC docket system directly; these findings come from the Google Patents record (which mirrors USPTO bibliographic data), Unified Patents, the Stanford NPE Litigation Database, and litigation PDFs on Justia. Where sources disagree I flag it. Also note a literal-identifier caution: the string "6157823" also resolves to JP Patent No. 6157823 (a u-blox "position determination" patent) — that is a different patent and different jurisdiction, not US 6,157,823.

Bibliographic record (literal)

Continuity: This is a continuation of application Ser. No. 08/364,479, filed 1994-12-23, now US 5,722,067 (same inventors/title). US 5,722,067 is the parent; US 6,157,823 is the child. A further family member, "Prepaid Security Cellular Telecommunications System," appears in the '851/related family (US 6,236,851) cited in the 2008 E.D. Tex. claim-construction order.

Assignment chain (per Google Patents reassignment records): 2008-08-07 assigned to ORBITAL SCIENCES CORPORATION (assignor HARNED, DAN BERT — recorded as an employee non-disclosure/assignment provision); 2008-08-07 ERICSSON, INC. recorded against ORBITAL SCIENCES CORPORATION as a "LICENSE (see document for details)."

Discrepancy flagged: Unified Patents displays the priority date as 1994-12-22, while Google Patents shows 1994-12-23, which matches the parent application's filing date. I treat 1994-12-23 as the operative value but note the one-day data conflict.

Abstract (as published)

"A cellular telecommunications system having a security feature which allows only pre-authorized users to complete cellular telephone calls. The system and method recognizes a cellular radiotelephone's pre-programmed a pre-selected telephone number and a automated number identification code (ANI). The pre-selected telephone number is reserved to the pre-paid cellular telecommunications system. The cellular radiotelephone transmits the ANI and a dialed number identification system code (DNIS) to a cellular switch, which contacts a host computer for call validation by the pre-paid service provider."

Plain-language overview of the independent claims

The claims cluster into three families. Every one turns on real-time validation of a pre-paid account tied to a wireless subscriber identifier, performed by a pre-paid service provider in communication with a wireless switch.

A. Incoming-call authorization (claims 1, 6, 9, 10, 11, 15, 16)

• Claim 1 — Method of completing pre-paid wireless calls to a subscriber: the subscriber's wireless number arrives at a wireless switch (the switch recognizes it as belonging to that subscriber), a computer with database access communicates with the switch, the system validates that a pre-determined account balance exists, and if valid the call is completed. This is the core "incoming call to a prepaid handset" claim.
• Claim 6 — Same "incoming" premise, but adds: attempt to connect the switch to the subscriber's wireless phone, check for connection, and periodically re-validate the call during the event until it terminates.
• Claim 9 — Switch receives an identifier for the called pre-paid subscriber, forwards it to the pre-paid service provider; the provider validates the account, passes the identifier back to a wireless switch to complete the call, keeps periodically validating in real time during the call, and interrupts the call mid-stream if validation fails.
• Claim 10 — The provider-side mirror of claim 9 (receives the identifier from a telecommunications service rather than forwarding it).
• Claim 11 — Like claim 6, but instead of periodic re-validation the system sets/uses a time limit based on the account balance and terminates the call when it expires.
• Claim 15 / Claim 16 — The "forwarding" and "provider-side" time-limit variants: validate, pass identifier to a wireless switch, complete the call, set a time limit from the account balance, terminate on expiry.
• Dependent claims 2–5 (off claim 1) add periodic validation during the event, termination on failed validation, termination by a party, and termination on time-limit expiry; claims 7–8 (off claim 6) add termination grounds; claims 12–14 add cost variables — time of day and call destination — and conversion of balance into a maximum call length.

B. Systems and methods for pre-paid wireless management using real-time validation (claims 17–28)
These are parallel "system / switch-side method / provider-side method" triplets, drafted to cover the same architecture from three claim-drafting angles:

• Claims 17, 18, 19 — Switch + pre-paid wireless service provider that selectively authorizes a call request based on information identifying the called pre-paid subscriber; plus periodic validation during the call and termination if validation fails.
• Claims 20, 21, 22 — Same architecture, but the validation mechanism is a time limit based on account balance that causes termination on expiry.
• Claims 23, 24, 25 — Same architecture, with real-time account-balance validation occurring prior to the call being authorized.
• Claims 26, 27, 28 — Adds an explicit database of pre-paid wireless subscribers with account information, consulted by the provider; authorization based on real-time validation of the identified subscriber's account balance. Dependent claims 58–59 (off claims 33–34) tie the database-accessing computer to the switch-facing computer and to a networked server.

C. Originating (outgoing) calls and switch-side logic (claims 29, 30, 31, 32, 33, 34, 35, 42)

• Claim 29 — Method: identify the caller as a pre-paid subscriber, connect the call to a pre-paid switching system, and have the wireless switch send the destination identifier and the caller's account identifier to that system, which validates the balance, connects the call, sets a time limit, and terminates on expiry.
• Claim 30 — Provider/switch-side mirror of 29 using periodic validation instead of a fixed time limit.
• Claim 31 — Provider/switch-side mirror using the time-limit mechanism.
• Claim 32 — Like claim 29 with periodic validation and termination if unsuccessful, and expressly recites that the account identifier is an electronic serial number (ESN).
• Claim 33 — System form: database of subscriber information + a computer receiving destination and account identifiers from the wireless switch that validates balance, connects the call, periodically validates, and terminates if validation fails.
• Claim 34 — Same system but with the time-limit mechanism.
• Claim 35 — Wireless-switch-side method: receive an identifier tied to the caller's pre-paid account, determine at the switch whether the identifier maps to a pre-paid account, and if so contact the pre-paid service provider and cause both the account identifier and the destination identifier to be sent to it.
• Claim 42 — Like claim 29, with periodic validation and termination on validation failure.

Dependent claims 36–41 (off claim 35) add provider-side validation, periodic validation until termination or a predetermined balance, termination at a predetermined balance, time-limit termination, and database lookup — including accessing a database remote from the provider (40) and sharing that database with other pre-paid service providers (41). Claims 43–57 add termination at zero balance, alternative identifier types (mobile identifier, telephone number, ANI, ESN), balance lookup and retrieval, remote-server database access and sharing across pre-paid switching systems, notifying the caller of account status and remaining balance (50, 51), and cost-variable-based rate conversion (53–55), plus who performs the identification and how the identifiers are entered/transmitted (56, 57).

Notable scope observations

• The background section advertises anti-fraud protection via a subscriber-designated pass-code/PIN and anti-cloning protection, but the granted independent claims do not recite a PIN; the recited security mechanism is identifier-based (ANI/mobile identifier/ESN/telephone number) validation against a pre-paid account. The PIN concept appears only in the specification's invocation of "a host computer-modified signal including the called telephone number, such as a pass-code or PIN number."
• The specification teaches decrementing balance in host-computer memory at fixed intervals (e.g., "$0.02 for each six seconds… off-peak"), with a fallback teaching that direct database decrementing may make writing back the balance unnecessary — relevant to the "real-time validation" limitations.
• In Freedom Wireless, Inc. v. Alltel Corp., No. 2:06-cv-00504 (E.D. Tex.), the court construed (i) "call" as including voice data, not merely signaling; (ii) "wireless switch/cellular switch" as "the MTSO or MSC"; and (iii) "recognizing" as recognizing that a call requires pre-paid processing based on identifying information (Justia PDF). These constructions bear directly on claim 1 and claim 11 of the '823 patent.

CAFC 2026 docket search — result

I found no Federal Circuit docket, appeal, or 2026 proceeding involving US 6,157,823. Specifics:

• Litigation of record for this patent is district-court level and historic: E.D. Tex. 2:06-cv-00504, 2:06-cv-00505, 2:07-cv-00151, 2:07-cv-00152; D. Ariz. 2:06-cv-01935; D. Mass. 1:00-cv-12234 and 1:05-cv-11062 (Stanford NPE DB; Unified Patents).
• One search surfaced a live 2026 Federal Circuit appeal in E.D. Tex. — Headwater Research LLC v. Cellco Partnership (Verizon Wireless), USCA No. 26-1884, from Civil Action No. 2:23-cv-00352. That appeal concerns a different patent and different parties and has no connection to 6,157,823. I mention it only so it is not mistaken for relevant, per your instruction not to return results for similar numbers.
• Because the '823 patent's anticipated expiration was 2014-12-23, and it is recorded as Expired – Lifetime, active 2026 appellate activity on this patent is unlikely — though I cannot rule out a collateral or fee-related proceeding I did not find.

When sources conflict, the fabrication risk

I have no authoritative source for any 2026 USPTO prosecution, PTAB proceeding, or CAFC appeal specific to 6,157,823. If you have a docket number (e.g., a 2X-XXXX CAFC appeal number or an IPR number), supplying it will let me verify directly rather than infer. Everything above is grounded in the linked records; nothing about 2026 activity should be treated as confirmed.

I'll research litigation involving US patent 6157823. Let me search multiple sources.

Let me dig deeper into the specific cases and their outcomes.

Let me get details on the Texas cases and the Federal Circuit outcome.

Litigation Involving U.S. Patent No. 6,157,823

Important caveats up front: I was able to run only a limited number of searches before hitting a research ceiling, so this list is complete as to the cases I could confirm but may not be exhaustive. Where I could not verify a detail, I say so rather than guess. I did not auto-correct any case numbers, patent numbers, or party names. Note that U.S. 6,157,823 ("Security cellular telecommunications system," Fougnies & Harned, priority 1994‑12‑23, filed 1998‑01‑20, granted 2000‑12‑05) is a continuation of U.S. 5,722,067 and was litigated alongside that patent; some sources blur the two.

Confirmed Cases

1. Freedom Wireless, Inc. v. Boston Communications Group, Inc., et al. (the principal case)

• Plaintiff: Freedom Wireless, Inc. (Phoenix, AZ; successor to Cellular Express, Inc.)
• Defendants: Boston Communications Group, Inc. ("BCGI"); Cingular Wireless LLC; AT&T Wireless PCS; CMT Partners (d/b/a Cellular One of San Francisco); Western Wireless Corp. (d/b/a Cellular One). The Federal Circuit appeal caption also lists Nextel Communications, Inc./Nextel Operations, Inc. (now Sprint Nextel Corp.) and Rogers Wireless, Inc. (a/k/a Rogers AT&T Wireless).
• Jurisdiction: U.S. District Court for the District of Massachusetts (Judge Edward F. Harrington)
• Case No.: 1:00-cv-12234 (also reported as No. 00-12234 (EFH); one secondary source, casemine.com, renders it "No. 00-CIV-1129" — treat that variant with caution)
• Filed: 2000
• Patents asserted: U.S. 5,722,067 and U.S. 6,157,823
• Outcome/status:
  • Claim construction (Markman) ruling April 23, 2003.
  • Jury verdict May 20, 2005: $128 million in damages against BCGI and four carriers.
  • Court upheld the verdict (denied BCGI's motion to reduce) in September 2005; also rejected BCGI's inequitable-conduct/unenforceability claims.
  • Injunction ordering BCGI to discontinue certain prepaid services entered Oct. 17, 2005; stayed by the U.S. Court of Appeals for the Federal Circuit on Dec. 12, 2005.
  • Settled July 2006: total $87 million — BCGI to pay $55.3 million (including a $12.6 million royalty license) and co-defendants $32 million.
  • Appeals to the Federal Circuit were briefed (appellate brief available at appellate.net) but were resolved/disposed of in connection with the settlement; I could not confirm a substantive Federal Circuit merits decision.

2. Freedom Wireless, Inc. v. Boston Communications Group, Inc., et al. (second D. Mass. action)

• Plaintiff: Freedom Wireless, Inc.
• Defendants (per Stanford NPE database): a long list of smaller/regional carriers, including Centennial Cellular Operating Co., Mountain State Cellular, Mid‑Missouri Telephone Co., Nebraska Wireless Telephone Co., Uintah Basin Electronic Telecommunications, Mobiletel Inc., Illinois Valley Cellular RSA 2, Thumb Cellular LLC, Bluegrass Cellular, East Kentucky Network LLC, Cincinnati Bell Wireless LLC, Dobson Communications Corp., Honolulu Wireless, Matanuska Telephone Association, and others.
• Jurisdiction: U.S. District Court for the District of Massachusetts
• Case No.: 1:05-cv-11062
• Filed: May 20, 2005 (same date as the verdict in Case No. 1 above)
• Status: I could not confirm the outcome; I list it because it appears in the Stanford NPE litigation database for this patent. Confidence: moderate — please verify whether it is a genuinely separate action or a docketing artifact.

3. Freedom Wireless, Inc. v. Alltel Corporation, et al.

• Plaintiff: Freedom Wireless, Inc.
• Defendants: Alltel Corp. / Alltel Communications, Inc.; United States Cellular Corp.; Cricket Communications, Inc.; Comverse, Inc.; VeriSign, Inc.; Plateau Telecommunications, Inc.; E.N.M.R. Plateau Telephone Cooperative; and others.
• Jurisdiction: U.S. District Court for the Eastern District of Texas, Marshall Division (Judge T. John Ward; Magistrate Judge Charles Everingham)
• Case No.: 2:06-cv-00504
• Filed: Nov. 30, 2006 (Unified Patents lists 2006-11-29)
• Claim asserted from this patent: Claims 17, 22, 27, 30 and 34 of U.S. 6,157,823 (per docket filings on Justia/PlainSite, including motions for partial summary judgment of infringement of claim 34)
• Outcome/status: Closed —terminated Nov. 1–2, 2010 per Unified Patents (one aggregator shows an earlier "closed 04/15/09" entry). Substantively resolved (settled/dismissed); I could not confirm the settlement terms.

4. Freedom Wireless, LLC v. Cingular Wireless LLC, et al.

• Plaintiff: Freedom Wireless, LLC
• Defendants: Cingular Wireless LLC and others
• Jurisdiction: U.S. District Court for the Eastern District of Texas
• Case No.: 2:06-cv-00505
• Filed: ~Nov. 2006
• Status: A claim-construction (Markman) memorandum and opinion issued in this case (available on Justia). I could not confirm the ultimate disposition.

5. Cingular Wireless LLC v. Freedom Wireless, Inc.

• Plaintiff: Cingular Wireless LLC (declaratory-judgment action)
• Defendant: Freedom Wireless, Inc.
• Jurisdiction: U.S. District Court for the District of Arizona (Judge James A. Teilborg)
• Case No.: CV06-1935 PHX JAT (also cited as 2:06-cv-01935)
• Filed: 2006
• Outcome: On June 26, 2007, the court granted Freedom Wireless's motion to dismiss for lack of subject-matter jurisdiction and dismissed the action, deferring the dispute to the Eastern District of Texas (Order, Doc. 66; govinfo.gov).

Listed but Not Fully Confirmed

• Freedom Wireless, Inc. v. [defendant] — E.D. Tex. Nos. 2:07-cv-00151 and 2:07-cv-00152. These two case numbers are listed as litigation on the Google Patents page for US 6,157,823 (Texas Eastern District Court). I was unable to confirm the parties, filing dates, or outcomes for either within my search budget.
• A Dec. 10, 2007 suit by Freedom Wireless against Ribbit LEAP Limited is referenced in a Ribbit LEAP 10‑Q/SEC filing. I could not confirm that this suit involved U.S. 6,157,823 specifically (Freedom Wireless asserted a portfolio of prepaid-wireless patents), so treat this as unverified.

Possibly Related but NOT Patent-Infringement Litigation

• In re Boston Communications Group, Inc. Securities Litigation (D. Mass., filed June 2005; later dismissed/terminated Dec. 15, 2006) — a shareholder securities class action (Rosenbaum Capital LLC) premised on BCGI's alleged failure to reserve for the Freedom Wireless patent judgment. This arose out of the patent case above but is not itself patent litigation over the '823 patent.

False Positives I Excluded

• JP 6157823 B2 (Japanese Patent No. 6157823, "位置の確認"/location determination, assignee u‑blox) — a different, unrelated patent that merely shares the digit string.
• Judson v. Infonautics, Inc., 1:01-cv-10464 (D. Mass.) — appears adjacent in the Stanford NPE database but is not this patent.

Summary

The '823 patent was chiefly asserted by Freedom Wireless, Inc. in: (i) the flagship D. Mass. action No. 1:00-cv-12234 against BCGI and major carriers (won a $128M verdict in 2005; settled for $87M in 2006); (ii) the E.D. Tex. action No. 2:06-cv-00504 against Alltel, U.S. Cellular, Cricket, Comverse, and VeriSign (closed 2010); (iii) the companion E.D. Tex. case 2:06-cv-00505; and (iv) was the subject of a dismissed declaratory-judgment action, Cingular Wireless LLC v. Freedom Wireless, Inc., No. 2:06-cv-01935 (D. Ariz.), dismissed June 26, 2007. Two additional 2007 E.D. Tex. dockets (2:07-cv-00151 and 2:07-cv-00152) are attributed to this patent but I could not verify their particulars.

Sources: Google Patents (patents.google.com/patent/US6157823); Unified Patents litigation portal (portal.unifiedpatents.com, incl. case pages for 2:06-cv-00504 and the caselist filtered to this patent); Stanford NPE Litigation Database (npe.law.stanford.edu/patent/6157823); Justia Dockets/PlainSite (E.D. Tex. dockets); govinfo.gov (D. Ariz. Order, 2:06-cv-01935); casetext.com (Cingular Wireless LLC v. Freedom Wireless, Inc.); Massachusetts Lawyers Weekly, Law.com, NYTimes, The Daily Record (verdict and settlement reporting); appellate.net (Federal Circuit brief, Freedom Wireless v. BCGI); casemine.com (D. Mass. ownership/standing ruling); SEC/Ribbit LEAP filings.

If you need the two unverified 2007 E.D. Tex. dockets (2:07-cv-00151 and 2:07-cv-00152) pinned down, PACER for the Eastern District of Texas or the Unified Patents case pages would be the next search targets.

I'll start by verifying the structured block's default (no AIA trials) against live sources.

Proceedings overview

Zero AIA trial proceedings are on file for US 6,157,823. The structured USPTO Open Data Portal block shipped with this task states verbatim that "The USPTO ODP API returns no AIA trial proceedings for this patent as of the most recent ingest," and the count of IPRs / PGRs / CBMs is therefore 0 active, 0 claims invalidated, 0 claims sustained, 0 settled, 0 institution denials. Independent web searching surfaced no IPR, PGR, or CBM docket number naming US 6,157,823 or naming Freedom Wireless, Inc. as patent owner, so nothing contradicts the ODP default.

The bottom line for a defendant today is not "the patent survived review and is hardened," and it is not "the claims were canceled." It is something stronger and simpler: this is an expired, never-PTAB-tested patent. The '823 patent's anticipated expiration was 2014-12-23 (20 years from the 1994-12-23 priority date carried over from the parent application Ser. No. 08/364,479, now US 5,722,067), and Google Patents records its legal status as Expired – Lifetime. Only district court litigation ever tested it. Defensive posture: no § 315(e)(2) estoppel exists because no IPR reached a Final Written Decision; but a demand letter citing the '823 patent in 2026 is asserting an expired patent whose entire recoverable-damages lookback window (35 U.S.C. § 286) closed before the patent's own term ran out.

Proceeding-by-proceeding detail

There is no proceeding to template. I am not going to populate an IPR20XX-XXXXX heading, because inventing a number is exactly the failure mode this analysis exists to prevent. What follows is (a) what I checked, and (b) the non-PTAB invalidity record that a defendant actually needs, since it is the only validity adjudication this patent has ever had.

Verification trail — how the "zero" was confirmed

• Canonical source (controlling): the structured "PTAB proceedings on file" block in this task — no AIA trials indexed by ODP.
• Independent search (corroborating): searches combining the patent number 6,157,823 with IPR2013–IPR2015, CBM2013–CBM2014, PTAB, and Freedom Wireless returned only district court claim-construction orders and Federal Circuit briefing. No PTAB petition, institution decision, FWD, or appeal.
• Plausibility check: the '823 patent is CBM-eligible (CBM reached patents of any filing date through 2020-09-16) and was IPR-eligible from 2012-09-16 onward. But the only infringement suits against it were filed in 2000 (D. Mass.), 2005/2006 (D. Mass.; E.D. Tex.), and 2006 (D. Ariz.) — all pre-AIA — and the patent expired 2014-12-23, leaving only a ~27-month IPR window before expiry. Petitioners evidently never walked through it. A CBM could theoretically have been filed after expiry through 2020-09-16; none appears.
• Residual unknown (stated plainly): ex parte reexamination is not an AIA trial and would not appear in the ODP AIA-trial list. I found no evidence of one, but I cannot rule one out from the sources I reviewed. If it matters, confirm against the '823 file wrapper in USPTO Patent Public Search (reexamination certificates are printed on the patent face).

Adjacent record — the litigation that actually tested the claims (not PTAB, but the estoppel/validity context a defendant needs)

• Freedom Wireless, Inc. v. Boston Communications Group, Inc., et al., D. Mass. No. 1:00-cv-12234 — jury verdict for Freedom Wireless on infringement and on validity (jury rejected invalidity); appealed; the appeal settled. The E.D. Tex. court later recorded: "After a jury trial, the plaintiff secured favorable verdicts on infringement and invalidity. Eventually, the case was settled on appeal." (See the E.D. Tex. claim-construction order, cases.justia.com, and Judge Harrington's standing/ownership memorandum, CourtListener 2533800.)
• Freedom Wireless, Inc. v. Boston Communications Group, Inc. (2003 Markman, D. Mass.) — asserted '823 claims 1-3, 5, 9-12, 15-20, 24-25, 27-31, 34-39, 42, 53, 57, 59. IPMall PDF
• Freedom Wireless, Inc. v. Alltel Corp., et al., E.D. Tex. No. 2:06-cv-00504 (filed 2006-11-30) — consolidated claim construction over US 5,722,067, US 6,157,823, and US 6,236,851; the court rejected the defendants' narrowing constructions and largely adopted Freedom Wireless's broader ones. Studicata summary
• Related District Court dockets touching the patent per the Google Patents family record: E.D. Tex. 2:06-cv-00505, 2:07-cv-00151, 2:07-cv-00152; D. Ariz. 2:06-cv-01935. All are infringement suits — none is a PTAB docket.
• Ownership/assignment events: 2008-08-07 assignment from inventor Dan B. Harned to Orbital Sciences Corporation, and a 2008-08-07 license to Ericsson, Inc. Current assignees listed: Freedom Wireless Inc and Orbital Sciences LLC.

Defensive value of the absence: A defendant cannot point to a canceled claim. But it also does not face a hardened patent — the '823 claims have never been construed by the PTAB under Phillips, and the only merits validity win (the BCGI jury) is a 20-year-old jury verdict in a case that settled on appeal, i.e., with no precedential claim-construction or invalidity ruling attached.

Strategic summary

Claim status — no claim is canceled; the patent is simply expired. US 6,157,823 issued 2000-12-05 with 59 claims. Because ODP shows no AIA trial, all 59 claims remain technically intact in the patent document — there is no IPR certificate under § 318(b) canceling or confirming anything. But the term ended 2014-12-23, and Google Patents lists the patent as "Expired – Lifetime." So the practical taxonomy is: zero claims CANCELED, zero SUSTAINED by the PTAB, all 59 UNTESTED by the PTAB and now time-barred from ever being tested there. The asserted-in-litigation claims (1-3, 5, 9-12, 15-20, 24-25, 27-31, 34-39, 42, 53, 57, 59) were litigated in district court and upheld by a jury, but that verdict is not a validity shield that binds anyone today.

Estoppel landscape — there is none, in either direction. Because no IPR reached a Final Written Decision under § 318(a), no petitioner, real party in interest, or privy is subject to § 315(e)(2) estoppel on this patent. That cuts both ways: a defendant today retains the full universe of § 102/§ 103 prior-art grounds, plus § 101 and § 112 defenses that IPR could never reach — including the inequitable-conduct theory BCGI pressed on appeal (the brief raised inequitable conduct, an on-sale/§ 102(g) prior-invention attack based on the Cominex application, and divided-infringement/direct-infringement theories). See BCGI's Federal Circuit appellant brief at appellate.net. Conversely, the patent owner is not estopped from anything, but has no favorable PTAB outcome to cite for deference.

Pattern signals. No repeat petitioner (there are no petitioners). No PTAB appeal activity by the patent owner. No defensive aggregator in the chain — Unified Patents appears nowhere in this patent's history; the litigation links in the Google Patents record are ordinary district-court infringement suits, and the Stanford NPE database shows only Freedom Wireless-initiated cases. The signals are those of a 2000s-era prepaid-billing patent campaign that never intersected the AIA trial regime: asserted hard in 2000-2008 (against BCGI and roughly two dozen regional carriers in the D. Mass. and E.D. Tex. actions), then ran out its term in 2014 without a single PTAB filing.

Recommended next steps

1. Check the expiration date first, before anything else. If a demand letter cites US 6,157,823, calculate the § 286 damages window. The patent expired 2014-12-23; damages are limited to the six years preceding the complaint. Any complaint filed on or after 2020-12-23 captures no infringing period, and a complaint filed on or after 2026-09-29 has a lookback window beginning 2020-09-29 — entirely post-expiration. Confirm the expiration against the patent's face and file wrapper, since Google Patents labels it an "anticipated expiration."
2. Do not brief validity unless you must. With no PTAB record, the only adverse merits rulings are the D. Mass. claim construction (IPMall) and the 2008 E.D. Tex. order adopting plaintiff-favorable constructions (cases.justia.com). Those constructions are, if anything, bad for a defendant — the court rejected "direct connection" and "two wireless switches" limitations and read "call" broadly. Attack on expiration/§ 286 first; treat invalidity as the fallback, not the opening.
3. If you need a PTAB artifact, there isn't one — and you can't create one now. No IPR/PGR can be filed against claims you may need to invalidate if the patent owner argues around expiration (and IPR of an expired patent is of limited value anyway: no amendment available and Phillips construction applies). Redirect that budget to a § 101/§ 112 or prior-invention theory in district court, where the BCGI appeal shows the prior-art attack (the Cominex application, § 102(g)) was genuinely contested and never resolved by a final appellate ruling.
4. Verify the ex parte reexamination question directly. Query USPTO Patent Public Search / PatentCenter for the '823 file wrapper and check the patent face for any reexamination certificate. This is the one gap in the "no post-issuance proceedings" conclusion that a records search — not web search — can close.
5. Gap for future diligence: the ODP AIA-trial list is the right canonical source but silently excludes ex parte reexamination and pre-AIA inter partes reexamination. For a 1994-priority patent like this one, both are plausible vehicles and should be checked separately.

Sources: US6157823A on Google Patents (claims, family, assignments, litigation links, expiration); CourtListener opinion 2533800; E.D. Tex. claim construction order, 2:06-cv-00504; 2003 D. Mass. Markman order; BCGI Federal Circuit appellant brief; Stanford NPE Litigation Database, patent 6157823. PTAB E2E for any direct docket check: https://ptacts.uspto.gov/ptabweb/.

I'll research the assignment record for this patent directly. Let me run targeted searches.

Let me dig into the assignment records specifically.

Let me search for more detail on the assignment records, correspondents, and the Ericsson/Orbital litigation.

I hit a research ceiling on the assignment-record detail (reel/frame and correspondent fields), but I retrieved enough to reconstruct the chain. I did not have direct access to assignmentcenter.uspto.gov / assignment.uspto.gov APIs; the assignment data below comes from the Google Patents "legal events" tab, the Unified Patents patent page, the Stanford NPE database, and the E.D. Tex. / D. Mass. docket filings. Where a field was not retrievable I say so rather than guess. I did not auto-correct any identifier.

⚠️ Contradiction flag with earlier sections: the Litigation section listed 2:07-cv-00152 as unverified parties. I can now resolve it: it is Freedom Wireless, Inc. v. Suncom Wireless Holdings, Inc., et al. (filed 2007-04-20, closed 2009-02-12), naming SunCom Wireless entities and Ericsson Inc. — and Orbital Sciences Corporation appears as a co-defendant in the same docket. This directly connects the previously-"unverified" docket to the 2008 assignment records. Also note the Google Patents current-assignee field lists "Orbital Sciences LLC" while the 2008 conveyance names "ORBITAL SCIENCES CORPORATION" — same/successor entity, different recorded forms.

Inventors

Unusual pattern — flagged: this is a genuine one. Harned conceived the invention while employed by Orbital Sciences under an invention-assignment covenant, yet the patents were issued to and owned by Freedom Wireless (Harned's outside venture). BCGI built its entire 2002 standing defense on Orbital's covenant, and the court ruled the covenant (i) was scope-limited to Orbital's space/space-data business and (ii) lacked present-conveyance language, so it never divested Harned. The 2008-08-07 recording of Harned→Orbital (conveyance type "new employee non-disclosure agreement including assignment provision") looks like a curative/confirmatory paper recorded years later — plausibly as part of the 2007–2009 E.D. Tex. settlement architecture involving Orbital and Ericsson. I cannot confirm the execution date on that paper, so I cannot state it was executed in 2008 (the recording date is 2008-08-07).

Original assignee

Freedom Wireless, Inc. (Phoenix, Arizona), through its predecessor Cellular Express, Inc. (per the D. Mass. standing order).

• Product/embodiment of the claims: Partially yes, historically. Freedom Wireless marketed a prepaid cellular offering — Unified Patents lists "Freedom Wireless, 'The Freedom to Choose! Get Pre-Pay Cellular,' sales pamphlet" as a cited reference in the family, and contemporaneous prepaid-cellular market literature names Freedom Wireless. The D. Mass. docket (in the related 2:07-cv-00152 action) describes it as "a development and technology company based in Phoenix, Arizona." So it was an operating prepaid-cellular service/technology company at inception, not a pure paper entity — but by the 2000s assertion era its visible activity was licensing and litigation.
• Primary line of business: Prepaid cellular telephone service / prepaid-wireless billing technology; later, patent monetization. It also received a portfolio transfer in settlement — VeriSign agreed (2008) to pay an undisclosed sum and transfer a portfolio of 10 U.S. and 12 foreign patents relating to prepaid wireless service (Phoenix Business Journal, 2008-05-19) — i.e., Freedom Wireless was acquiring prepaid-wireless patents, a classic aggregator tell.
• Current status: Not confirmed. No evidence retrieved of current operations; the patent expired 2014-12-23. I will not assert dissolution/bankruptcy without a source. Confidence: low.

Assignment timeline

Important limitation: I could not retrieve reel/frame numbers, execution dates, or the correspondent/attorney of record for any record. The Assignment Center's per-record fields were not surfaced in the sources I could reach. Everything time-stamped below is a recording date from Google Patents legal events, not an execution date. I have not invented reel/frame values.

• Executed not retrieved / recorded 2008-08-07 — Reel not retrieved

  • Conveyance: Assignment — recorded as "NEW EMPLOYEE NON-DISCLOSURE AGREEMENT INCLUDING ASSIGNMENT PROVISION"
  • Assignor: HARNED, DAN BERT
  • Assignee: ORBITAL SCIENCES CORPORATION
  • Correspondent: not retrieved. (Because the correspondent could not be captured, I cannot assess the "repeat correspondent" signal — this is a gap, not a negative finding.)
  • Context: Curative/confirmatory inventor assignment recorded seven years after the court had already held Harned validly owned and assigned to Freedom Wireless; timing overlaps the 2007 E.D. Tex. actions naming Orbital Sciences as a defendant — appears settlement-driven rather than a change in beneficial ownership.

• Executed not retrieved / recorded 2008-08-07 — Reel not retrieved

  • Conveyance: License ("LICENSE (SEE DOCUMENT FOR DETAILS)")
  • Assignor: ORBITAL SCIENCES CORPORATION
  • Assignee: ERICSSON, INC.
  • Correspondent: not retrieved.
  • Context: Settlement license granting Ericsson rights — aligns in time with Ericsson's appearance as a defendant (through SunCom) in 2:07-cv-00152 and the later Joint Motions for Entry of Consent Judgment between Freedom Wireless and both Orbital Sciences Corporation and Ericsson, Inc. (docket entries in 2:07-cv-00152).

• Not directly retrieved — original assignment (pre-issue): The patents were "assigned to Freedom Wireless by way of its predecessor company, Cellular Express, Inc." per the D. Mass. standing order. I have no reel/frame, execution date, or correspondent for the original Cellular Express → Freedom Wireless instrument. Treat the existence of that instrument as established by the court, but its recording particulars as unretrieved.

• 2008-08-07 is the only date on which post-issuance conveyances are recorded, and both are the same day — consistent with a single settlement-closing batch rather than an arms-length secondary market transfer.

No later assignments retrieved. Current Google Patents "Current Assignee" reads "Freedom Wireless Inc / Orbital Sciences LLC" — which is consistent with (a) Freedom Wireless remaining beneficial owner (the 2008 Harned→Orbital paper was curative only, per the 2002 ruling) and (b) Orbital appearing as a recorded chain party.

Timeline diagram

timeline
    title Ownership of US 6157823
    1993 : Invention conceived by Harned and Fougnies
    1994 : Parent filed by Freedom Wireless
    1998 : Continuation application filed
    2000 : Patent issued
         : First infringement suit filed
    2005 : 128M jury verdict vs BCGI
    2006 : BCGI case settled for 87M
    2007 : Freedom Wireless sues Ericsson and Orbital
    2008 : Harned to Orbital assignment recorded
         : Orbital license to Ericsson recorded
         : VeriSign settles and transfers patent portfolio
    2009 : Consent judgments with Orbital and Ericsson
    2014 : Patent expired

NPE / troll-pattern signals

1. Shell-entity transfer — NOT PRESENT. The recorded assignees are Freedom Wireless, Inc., Orbital Sciences Corporation, and Ericsson, Inc. — all identifiable operating entities; no "IP / Patents / Licensing / Holdings / Ventures" LLC appears in the chain. The Orbital "LLC" in the current-assignee field is a form-of-entity variant of an operating aerospace company, not a licensing shell. Caveat: the "Cf Capital Ltd" name that appears in the sibling family (US 5,722,067 page on Unified Patents) did not appear in the '823 chain as I retrieved it; if it does appear on a reel I could not read, this signal would need re-evaluation.

2. Known asserter in the chain — NOT PRESENT (with a partial-credit note). No assignee matches the named rolls (Acacia, Marathon, IV, IPNav, Wi-LAN, Mosaid/Conversant, Vringo, Pendrell, Innovatio, MPHJ, Lumen View, Round Rock, Document Generation Corp, Spangenberg entities). However, Freedom Wireless itself is profiled as a high-frequency plaintiff / individual-inventor-started NPE by the Stanford NPE Litigation Database (npe.law.stanford.edu/patent/6157823, tag "Individual-inventor-started"), and it filed serial suits (D. Mass. 2000 and 2005; E.D. Tex. 2006 ×2 and 2007 ×2; D. Ariz. DJ 2006). So the plaintiff is a recognized serial asserter even though the chain assignees are not list-members.

3. Repeat correspondent across the chain — UNCLEAR (data gap). I could not retrieve the correspondent/attorney of record for any record, so I cannot test recurrence. Do not read this as a negative. This is the single most valuable field in your framing and it was unavailable to me; the next step is a direct Assignment Center query on "6157823" to pull the reel/frame and correspondent for the 2008-08-07 pair.

4. Cascading transfers — NOT PRESENT. Only two post-issuance recordings exist in my data, both dated 2008-08-07, and they move in a single direction (inventor → employer → licensee). No chained LLC hop-scotch within 24 months.

5. Pre-litigation transfer — NOT PRESENT. The 2008-08-07 recordings post-date every infringement filing (earliest 2000) by years; they fall within the 2:07-cv-00152 litigation window and immediately precede the 2009 consent judgments. This is a litigation-resolution transfer, not a pre-filing venue/standing set-up. (Note the inverse quirk: the 2002 standing challenge was resolved in Freedom Wireless's favor five years before the curative recording, so the chain was not arranged to manufacture standing.)

6. Bankruptcy fire-sale — NOT PRESENT. No Chapter 7/11 sale of this patent retrieved.

7. Privateering — NOT PRESENT / UNCLEAR. The only candidate would be Ericsson's 2008 license from Orbital, but that reads as a defensive settlement license in the 2:07-cv-00152 consent-judgment context, not an operating company arming an NPE against competitors. No evidence Ericsson directed Freedom Wireless's assertions.

8. Defensive aggregator — NOT PRESENT. Chain does not terminate at RPX, AST, LOT, Unified, or OIN.

Net: the ownership-chain signals (1, 4, 5, 6, 7, 8) are all negative, which cuts against a high-confidence NPE call. The only affirmative evidence is entity/plaintiff profiling (signal 2 partial credit + the Stanford NPE classification + the VeriSign portfolio-acquisition settlement showing Freedom Wireless acting as an aggregator in its own right).

Verdict

NPE — moderate confidence.

This is a case where the chain looks clean but the asserter does not. The recorded post-issuance conveyances are two same-day 2008-08-07 instruments (Harned→Orbital Sciences Corporation as an employee-assignment paper; Orbital Sciences Corporation→Ericsson, Inc. as a license), both far after the 2000 first suit and folded into the 2:07-cv-00152 consent judgments — so no shell transfer, cascading LLC chain, pre-litigation transfer, bankruptcy sale, or defensive-aggregator endpoint is present. What drives the call is that the asserting entity, Freedom Wireless, Inc., is classified by the Stanford NPE Litigation Database as "Individual-inventor-started" NPE and filed serial suits against major carriers (BCGI/AT&T/Cingular/Nextel, Alltel, U.S. Cellular, Cricket, Verizon-side Cingular, Ericsson/SunCom), while also acquiring a 22-patent prepaid-wireless portfolio from VeriSign in the 2008 settlement — the behavior of a licensing vehicle, not a market participant. It falls short of "high confidence" because zero shell-transfer or known-NPE-list evidence appears in the reel chain I could read, and because the original assignee did once operate a prepaid-cellular service (Cellular Express/Freedom Wireless, Phoenix).

Correction check / standing-record note: the verdict is not "Operating-company assertion" despite the historical operating business — the current listed assignee (Freedom Wireless, with Orbital Sciences in the chain) does not appear to ship a product embodying claim 1's "wireless switch ↔ pre-paid wireless service provider" architecture, and the patent expired 2014-12-23.

Verification link (Assignment Center): https://assignmentcenter.uspto.gov/ → search 6157823 (USPTO patent-number search) or the mirror at https://assignment.uspto.gov/patent/index.html.

What would change this verdict:

• The reel/frame + correspondent for the two 2008-08-07 records. If the same attorney/firm of record filed the Harned→Orbital paper and the Orbital→Ericsson license and recurs on Freedom Wireless's other family members ('067, '851), signal 3 flips to present and recurrence would push toward high confidence.
• Confirmation of whether "Cf Capital Ltd" (seen on the sibling '067 page) is also a recorded assignee on '823. If it is, re-run signals 1 and 4 — that would be the first shell-suffix-style entity in the chain.
• A PACER pull of 2:07-cv-00151 and the 2:07-cv-00152 consent judgments, which may recite the assignment/license terms that generated the 2008 recordings.

Two things I could not verify and will not assert: (i) any execution date for the recorded conveyances (only recording dates are known), and (ii) any 2026 assignment activity — the patent is recorded Expired – Lifetime with anticipated expiration 2014-12-23, so a 2026 transfer would be extraordinary and none was found.

I'll research the prior-art citations for US 6,157,823. Let me run several targeted searches.

Let me pull the front-page references and prosecution-history references for the '823 patent.

Prior Art for US 6,157,823 — "Security cellular telecommunications system"

Scope, sourcing, and one methodological correction (read first)

Two identifiers, one caution. I was asked to search the USPTO database for patent number 6157823. I could not reach USPTO PatentCenter directly within my search budget; everything below is grounded in the Google Patents record (which mirrors USPTO front-page data), the BCGI/Massachusetts prosecution-and-trial record, the E.D. Tex. Alltel Markman order, and the EPO/Google patent full-text indexes. I did not auto-correct any number.

A date flag for the record: the task header states the current date as April 26, 2026, while the operating environment reports 2026-09-29. This does not change any analysis below (the patent expired 2014-12-23), but the earlier-generated sections in this file use 2026-09-29.

Methodological correction that matters more than anything else here. The Google Patents page for US6157823 contains a large list headed "Cited By (102)." That is a list of forward citations — later patents that cite the '823 patent. It is not prior art to the '823 patent, and none of it can anticipate the '823 claims under § 102, because every entry postdates 1994-12-23/1998-01-20. If the request "look at each patent citation for 6157823" is executed against that list, the output would be legally meaningless. Prior art to the '823 patent is the set of backward citations — references cited on the face of, or cited against, the '823 patent (US 09/009,199). That is what I analyze below.

Second correction. Patent-data aggregators (and search engines) blur three patents that share the Fougnies/Harned priority chain — US 5,722,067 ('067), US 5,854,975 ('975), US 5,236,851 ('851, i.e., US 6,236,851) — with US 6,157,823 ('823). Many "prior art" lists floating around are actually the reference lists of those siblings. I flag wherever I could not separate them.

1. Confirmed identity of the target

The effective critical date is 1994-12-23, not the 1998 filing date. Any § 102 reference therefore must predate 1994-12-23 (for § 102(a)/(b)), or, for § 102(e), must be a US application filed before 1994-12-23. Pre-AIA § 102 controls; the AIA is inapplicable to a 1998 filing.

2. Prior art of record / of substance for the '823 patent

2.1 — U.S. Pat. No. 5,353,335 (D'Urso) — the acknowledged prior art

Brief description (as the '823 patent itself characterizes it). A public switched telephone network (PSTN) prepayment system with multilingual capability. The user buys calling time, receives a card with an account number, and dials a toll-free (1-800) number at blocks 32/34 of FIG. 2. A host computer validates the card (36), checks whether a call is in progress (44/46), prompts for a destination number via a VRU (48), validates it (50), retrieves credit from a management-server database (54), tests credit against a minimum threshold (52/56) and against the cost of a one-minute call (58), outpulses the dialed number (60), senses destination off-hook (62), starts a timer (64), stops it on on-hook (66), and then overwrites the account record with the recalculated balance (68).

§ 102 analysis. This is the single most important reference, and the honest answer is that it does not anticipate any granted '823 claim, for a reason the patentees themselves argued and a court accepted:

• Every independent '823 claim requires wireless/Wi-Fi-free wireless architecture — a "wireless switch," a "wireless telephone number," or "pre-paid wireless" service (claims 1, 6, 9, 10, 11, 15, 16, 17–28, 29–35, 42). In Freedom Wireless, Inc. v. Alltel Corp., No. 2:06-cv-00504 (E.D. Tex.), the court construed "wireless switch/cellular switch" narrowly as "the MTSO (mobile telephone switching office) or MSC (mobile telephone switching center)" (Justia PDF). D'Urso is a wireline PSTN/card system; it discloses no MTSO/MSC.
• D'Urso's identification is user-keyed account number, not ANI/ESN/mobile identifier resolved at the switch.
• The '823 claims directed to incoming calls to a pre-paid handset (1, 6, 9, 10, 11, 15, 16) have no counterpart in D'Urso at all.

Where D'Urso does bite: as a § 103 reference (and as § 102(b) art for its disclosed sub-features). Its blocks 52–58 (validate balance against a rate for the destination) and 62–68 (timer start on off-hook, stop on on-hook, decrement/overwrite) read directly on the "time limit based on the account balance" and "periodically validating … during the telecommunications event" limitations of claims 2–5, 11, 12–14, 15, 16, 20–22, 30–31, 34, 36–39. The '823 specification's own FIG. 7 accounting loop (blocks 126–136) is a wireless restatement of D'Urso's FIG. 2 loop. A § 103 combination of D'Urso + an ordinary cellular MTSO reference is the strongest invalidity theory that existed against the '823 patent.

2.2 — The "CSI" proposal materials (non-patent literature; on the face of the '823 patent)

Brief description. CSI (a would-be competitive switch operator) sought authority to interconnect its own switch with carriers' MTSOs and with the LEC/IXC network. The only prepaid-related line in the entire proposal is the Widmar declaration's: "pre-set credit limits could be established on a per-customer basis. Customers who present credit risks could be required to pre-pay for service…."

§ 102 analysis. The court record in the BCGI litigation (storage.courtlistener.com/harvard_pdf/2580067.pdf) is unusually explicit and I rely on it: the CSI materials contain no prepaid-account disclosure, no flowchart or description of how prepaid service would be implemented, and nothing about periodic validation or mid-call teardown (¶¶ 98–103). It therefore cannot anticipate any '823 claim — it is non-enabling as to every claim element that matters, and the defendants' own expert effectively conceded this on cross-examination. It is relevant here as a § 102(b) "printed publication" of record that failed, and as the centerpiece of the unsuccessful inequitable-conduct defense.

2.3 — The Wise application → U.S. Pat. No. 5,826,185 (Banana Cellular)

Brief description. A prepaid cellular telephony system operated by Banana Cellular, which ran a retail prepaid cellular store. Per the trial record, "the system Banana Cellular was using in 1993 was the same as what is described in the Wise patent."

§ 102 analysis — and an important qualification. Two distinct prior-art events attach to this reference:

1. The patent itself (§ 102(e)). For a pre-AIA § 102(e) rejection, the Wise application's US filing date must predate 1994-12-23. I could not verify that filing date. If Wise was filed in 1995 or later (which the timeline suggests), it is not § 102(e) art against '823, and its Oct. 1998 issuance postdates the 1998-01-20 '823 filing, so it is not § 102(a)/(b) art either. I therefore do not assert Wise as a § 102 anticipation of any '823 claim.
2. The Banana Cellular system itself (§ 102(b) on-sale / public use). Defendants' disclosures in the BCGI case listed a "Prepaid cellular telephony system offered for sale prior to December 1, 1993" — i.e., more than one year before the 1994-12-23 priority date. This is a colorable § 102(b) anticipation/public-use reference, and the trial record shows Freedom took it seriously (Fish & Richardson opinion letter; the s 1.56 analysis of whether it was cumulative to Wise). Mr. Fougnies visited the Banana Cellular store in December 1993 and placed a demonstration call. That fact pattern is why the inequitable-conduct claim existed.

2.4 — U.S. Pat. No. 5,722,067 (Fougnies & Harned) — not prior art

The '823 specification opens with: "This is a continuation of application Ser. No. 08/364,479, filed Dec. 23, 1994, now U.S. Pat. No. 5,722,067." Because '823 claims § 120 benefit to that application, the '067 patent is the same inventive entity and the same family and is not prior art under § 102 (it cannot be "by another," and a patentee's own earlier-filed, commonly-owned application is not § 102(e) art of the same family). It appears in the "References Cited" list of unrelated later patents (e.g., US 5,778,313) — again, that is a forward citation, not prior art. Listed here only so it is not mistaken for a § 102 reference.

2.5 — Related siblings (US 5,854,975; US 6,236,851) — not prior art either

Same family (the '975 is a continuation-in-part of Ser. No. 08/364,479; the '851 is a descendant). They are the same patent family and are cited on Google Patents' "Applications Claiming Priority" table, not on a prior-art table.

3. Consolidated § 102 mapping

4. What must not be presented as prior art

• The entire "Cited By (102)" list on the Google Patents page — e.g., US 6,704,563, US 7,187,928, US 7,486,945 (all Boston Communications Group / BCGI, i.e., the losing defendant); US 7,428,510 and US 7,543,158 (TeleCommunication Systems); US 7,711,359 / US 7,869,800 (Telespree); US 7,088,987 and US 7,983,655 (AT&T/SBC). These are later patents; by definition they cannot be § 102 art against a 1994/1998 patent. They are useful only as evidence of the '823 patent's technological influence.
• The EPO/PCT search-report references I surfaced — EP 0 642 283 (Nokia Mobile Phones); US 5,673,259 (Quick); US 5,537,399 (Du); US 5,313,461 (Ahl); US 4,654,867 (Labedz); US 5,603,081 (Raith); Mouly & Pautet, GSM System for Mobile Communications (1993); Tanenbaum, Computer Networks (1993). These belong to international application PCT/SE 98/01888 / WO 99/21381 (an Ericsson-side filing), not to US 6,157,823 (PCT search report PDF). Do not attribute them to this patent.
• The IPR-petition "(56) References Cited" table I surfaced (DE 3707244; EP 0166885 / 0346925 / 0368673 / 0391597 / 0468688 / 0664621; FR 2345865; JP 58-164007 / 3-26031 / 512374; WO 9115927; plus ADC Kentrox and Foxcom Wireless literature) comes from a distributed-antenna / RF-transport proceeding, not prepaid cellular, and is unrelated (ptacts.uspto.gov petition 1553924). Excluded.
• JP Patent No. 6157823 (u-blox, "位置の確認"/position determination) — shares only the digit string. Excluded (consistent with the earlier-generated sections).

5. Bottom line and what I could not verify

Bottom line. The '823 patent's prior art of record is thin, and that thinness is itself the story: the only patent the patentees engaged with was D'Urso, US 5,353,335 (iss. 1994-10-04), which is a wireline prepaid card system — it discloses balance validation, rate lookup, timed decrementing and disconnect-on-depletion, but not a wireless switch, not ANI/ESN-based identification, and not incoming-call control. Under the E.D. Tex. construction of "wireless switch" as MTSO/MSC, D'Urso therefore anticipates none of the granted '823 claims on its own; its real force is as a § 103 backbone. The NPL of record (the 1991 CSI proposal) was found non-enabling and the Examiner never used it to reject a claim. The genuinely dangerous § 102(b) theory — the pre-December-1993 Banana Cellular prepaid system / Wise ('185) family — was litigated only as inequitable conduct, and the inequitable-conduct challenge failed.

What I could not verify within my search budget (stated rather than guessed):

1. The verbatim front-page "References Cited" list of US 6,157,823 (U.S. patent documents, foreign documents, and NPL). The supplied Google Patents full text contained the forward-citation table ("Cited By (102)") but the backward-citation section was not present in what I received. The front page is known to include the CSI NPL items (per the BCGI opinion, ¶ 97), but I have not confirmed the complete list or any U.S. patent documents appearing alongside them.
2. The Wise application's U.S. filing date — determinative of whether US 5,826,185 is § 102(e) art.
3. Whether the '823 patent's file wrapper contains any IDS item beyond the CSI documents and the Wise application.

Next search targets to close these gaps: USPTO PatentCenter / Patent Application Information Retrieval for application 09/009,199 (full IDS and "References Cited" image); the '823 patent front-page TIFF/PDF via patentimages; and PACER/Unified Patents case pages for E.D. Tex. 2:06-cv-00504 for the defendants' prior-art statement of contentions (which, unlike the patent's own face, will list the invalidity references BCGI/Alltel actually pleaded).

I'll first check whether the fetched page actually contains a cited-references/prior-art listing, since the task directs me to rely on it.

Obviousness Analysis — U.S. 6,157,823 under 35 U.S.C. § 103

0. A threshold sourcing point (read first)

You asked me to use "the results from the Prior Art section of this page." I have to flag that the page as fetched for US 6,157,823 does not contain a §56 "References Cited" list. What it contains is:

• a "Prior art keywords" block (wireless, call, paid, subscriber, account) — machine-extracted, not evidentiary art; and
• a "Cited By (102)" block — forward citations.

The Cited By documents cannot serve as §103 prior art against the '823 patent, because every one of them post-dates the 1994-12-23 critical date (earliest priorities in that list are US 6,434,378 B1, priority 1995-12-08; US 2002/0039899 A1, priority 1995-12-11). If anything, they are evidence of what the field looked like after the invention.

So the only prior art genuinely on the page is the art the specification itself admits: U.S. Pat. No. 5,353,335 to D'Urso (issued Oct. 4, 1994), described at length in the "Description of the Prior Art" and depicted in FIG. 2. To build an actual §103 combination I supplemented with one same-field reference I could confirm by search, and I label it as such below. I did not fabricate a prosecution-history art list.

Note also the one-day data conflict already flagged in the earlier sections (Unified Patents shows priority 1994-12-22; Google Patents shows 1994-12-23). It is immaterial here — the references below clear either date.

1. Legal framework and PHOSITA

The application was filed 1998-01-20 with a 1994-12-23 priority claim, so pre-AIA §103(a) governs (Graham v. John Deere; KSR Int'l v. Teleflex). The hypothetical person having ordinary skill in the art is an engineer or systems architect with ~2–4 years' experience in telephone switching and cellular network engineering (MTSO/MSC call processing, ANI/ESN/DNIS signaling, T1/MF/DTMF outpulsing), familiar with the then-current state of prepaid telephony and with cellular billing (calling-party-pays vs. receiving-party-pays).

2. Scope and content of the prior art

2.1 D'Urso — U.S. 5,353,335 (admitted prior art; §102(a)/(e), pre-dating 1994-12-23)

Per the '823 specification's own description, D'Urso discloses:

• a prepaid account identified by an account number, with a database managed by a "service management computer" reached over a LAN;
• validation of the account and available credit before the call is passed;
• comparison of balance to the cost of a minimum quantum (one minute);
• setting a call-duration timer / time value from the balance and decrementing the balance at intervals while the call is in progress;
• disconnecting the call on depletion of the balance, and a VRU announcement of the remaining balance;
• destination-based and time-based rating ("stored call rate associated with the caller's destination number").

D'Urso is landline/PSTN, and the spec stresses that it is "fundamentally different" from a cellular implementation. That admission is important — it frames the alleged invention as relocating a known prepaid control architecture into a different switching environment, which is the classic KSR fact pattern.

2.2 US 5,826,185 — "Cellular phone system wherein the air time use is predetermined" (Banana Cellular, Inc. / "PATTI")

(confirmed by search; priority 1994-11-15 — earlier than both the Dec. 22 and Dec. 23, 1994 dates; granted 1998-10-19/20; app. 08/699,168.) It discloses, in the cellular environment:

• an MTSO that "recognizes a unique serial number from the cellular phone" and directs the call to a prepaid airtime transaction tracking interface;
• the tracking interface ("PATTI") checking whether the account has available airtime units and refusing to answer if none;
• connecting the call and continuously deducting airtime units until the call is disconnected, with a periodic recheck and a HANGUP when units run out;
• a return signal telling the user how many units remain;
• rate selection by destination ("local, long distance or international … dependent on where the call is directed").

2.3 General knowledge in the art (no citation needed beyond the specification's own admissions)

ANI/DNIS and ESN transmission, MTSO/MSC routing, wink/off-hook supervision, MF/DTMF digit outpulsing, and — cited by the '823 spec itself — peak/off-peak time-of-day rating. Prepaid telephony generally (e.g., the Kamil patents referenced in contemporaneous art) was likewise established.

3. What the claims add over the art — and why it is obvious

The independent claims reduce to three functional clusters. For each I give the combination and the motivation.

A. Claims 1, 6, 9–11, 15–16 (prepaid incoming/terminating calls)

Motivation to combine. (i) The two references address the same problem — preventing service beyond a prepaid balance — in the same field of endeavor (telephony switching), so combination is within the ordinary creativity of a PHOSITA. (ii) The '823 specification itself supplies the motivation, criticizing D'Urso for requiring "a plurality of input events" and for lacking "direct interface with the remote database for real time account balance adjustment," and praising transparent ANI-based identification. A stated, known problem plus a known solution is the essence of §103. (iii) Extending prepaid control to terminating calls is a predictable response to a known business/regulatory condition the spec concedes ("where cellular service is offered on the basis that the subscriber pays … irrespective of whether the subscriber is originating or receiving a call"). Once a prepaid platform already sits between the switch and the network for originating calls, applying the same validate-connect-decrement-terminate loop to a terminating call is a predictable variation using the same equipment and signaling (KSR).

B. Claims 17–28 (system/method triplets; real-time validation; accounts database)

Claims 26–28 add "a database of pre-paid wireless subscribers … that is accessed by the pre-paid wireless service provider." D'Urso teaches exactly this (the card/account database on the LAN-connected service management computer); '185 teaches a "cellular database" queried by the PATTI computer. Claims 17–19 (periodic validation + termination on failure) and 20–22 (balance-based time limit) map onto D'Urso/'185 as set out in Part A. Claims 23–25 (validation "prior to a call being authorized") are squarely D'Urso's authorization step. Dependent claims 58–59 (computers networked to a server) read on D'Urso's LAN architecture.

C. Claims 29–34, 42 (originating calls) and 35–41

• Claims 29–34 are originating-call claims — the closest environment. The combination of D'Urso (prepaid validation + decrement + time limit) with US 5,826,185 (MTSO recognizes the phone, sends identifier and dialed number to a prepaid tracking interface, which validates and continuously deducts) renders these obvious with essentially no gap. Claims 32 and 52 expressly recite an ESN — and '185's disclosure is precisely an MTSO that "recognizes a unique serial number from the cellular phone." That is a near-perfect anticipatory-style disclosure of the ESN limitation; its presence merely for §103 makes the result a fortiori.
• Claims 35–41 (switch-side determination; database remote from the provider; sharing the database across providers) are met by D'Urso's remote, LAN-connected service-management database, reinforced by the '823 spec's own statement that "a plurality of service providers may … operate from the same remote server computer." Claims 40–41's "remote"/"shared" features are architecture-level choices with no unexpected technical effect.
• Claims 50–51 (notify the caller of account status and remaining balance) are explicitly taught twice: D'Urso's VRU balance announcements and '185's user-indicating return signal.
• Claims 43 (terminate at zero balance), 44–46/52 (mobile identifier / telephone number / ANI / ESN), 47–49 (find account, retrieve balance, remote server, sharing), and 56–57 (identification at the switch; destination entered by the subscriber and account identifier sent transparently) are all either the routine cellular signaling described above (ANI/ESN are sent by the handset as a matter of standard protocol) or features the specification itself describes as conventional.

4. Anticipated counterarguments and secondary considerations

The patentee's strongest non-obviousness arguments, and their weaknesses:

1. "D'Urso is landline; the spec says it is 'fundamentally different.'" — This cuts for obviousness: the difference is substitution of a known environment, and the claims recite no cellular-specific structure beyond conventional MTSO/MSC signaling. KSR rejects "the mere substitution of one known element for another" as a basis for patentability.
2. "'185 blocks incoming calls and uses hotlining/DID, so it teaches away from prepaid terminating calls." — Teach-away requires a teaching that the combination would not work or would be inferior. '185's incoming-call blocking is a billing-policy setting ("based on the CPU's choice … block incoming calls or having the calling party pay"), not a technical bar to prepaid terminating calls. It is weak.
3. Secondary considerations. The earlier sections of this analysis note the Freedom Wireless jury verdict ($128M, later $87M settlement) and the asserted claims in E.D. Tex. (17, 22, 27, 30, 34). Industry adoption and the verdict could be pressed as commercial-success and long-felt-need evidence. But the patentee must show nexus between the indicia and the claimed subject matter — and the accused products' functionality (generating prepaid wireless systems) overlaps heavily with art such as '185. Secondary considerations are the patentee's best defense, but they do not neutralize a strong, well-mapped D'Urso + '185 combination.

5. Bottom line

• Claims 1, 6, 9–11, 15–16, 17–25, 29–34, 42 — obvious over D'Urso in view of US 5,826,185, with the '823 specification's own admissions (peak/off-peak rating; transparent ANI identification; subscriber-pays-incoming service) supplying the motivation.
• Claims 26–28, 35–41, 47–49 — obvious over D'Urso + '185 (databases, remote/shared access), the shared-database feature being an architectural choice with no unexpected effect.
• Claims 2–5, 7–8, 12–14, 43–46, 50–57 — obvious; each maps to D'Urso (timer, disconnect, VRU balance notice, rate lookup) or '185 (continuous deduction, periodic recheck/HANGUP, ESN recognition, remaining-units signal, destination-based rate).
• Claim 32 / 52 (ESN) is the single most vulnerable limitation — '185 expressly discloses MTSO recognition of the phone's serial number.

6. Confidence and open items

• High confidence: the D'Urso disclosures (taken verbatim from the patent's own Description of the Prior Art) and the US 5,826,185 disclosures (verified by search).
• Cannot confirm: the actual §56 references cited during prosecution of the '823, or any examiner restriction/allowance rationale — neither the fetched page nor my searches produced them. If a §56 list (or an IPR petition citing art against '823) is available, it would sharpen this analysis; my searches hit a budget ceiling before locating one.
• Do not treat the "Cited By (102)" list as prior art — it is forward-citation material that post-dates the 1994 critical date.

Sources: Google Patents, US6157823A (patent text incl. Description of the Prior Art and Cited By); Google Patents / Unified Patents / uspto.report records for US 5,826,185 A ("Cellular phone system wherein the air time use is predetermined," Banana Cellular, Inc., priority 1994-11-15, granted 1998-10-19/20, app. 08/699,168) and its printed claims; the '823 specification's own admissions (peak/off-peak rating; multi-provider remote server; subscriber-pays incoming calls). All patent and case identifiers are reproduced literally as found; no auto-correction applied.