US 5317663

I'll verify this against live sources before summarizing.

US Patent 5,317,663 — Verified Summary

Verification note: I searched broadly for this number. Live results (Google Patents, EveryPatent, RPX Insight, and later patents citing it) all consistently identify US 5,317,663 A / "One-piece SC adapter." I did not locate any CAFC docket entry or Federal Circuit 2026 activity for this patent. That negative result is qualified below.

Bibliographic Data

Assignment history of record (as indexed): ADC Telecommunications assignment recorded at filing (1993); a security agreement to JPMorgan Chase Bank, N.A. as administrative agent (Apr. 3, 2008); a release by the secured party back to ADC (Jan. 11, 2010). Google Patents lists the present holder as CommScope Connectivity LLC, consistent with CommScope's later acquisition of ADC's connectivity business.

Prior Art Cited on the Face of the Patent (5 references)

• US 3,923,371 — Dalgleish, Northern Electric Co. (1975)
• US 4,676,589 — Miyashita et al., Dai-Ichi Seiko K.K. (1987)
• US 4,824,203 — Kunze et al., Siemens AG (1989)
• US 4,890,897 — Cook, Minnesota Mining & Manufacturing (3M) (1990)
• US 5,125,058 — Tenerz et al., Radi Medical Systems AB (1992)

Abstract (verbatim)

"An adapter for holding two fiber optic connectors in coaxial alignment. The connectors include a generally cylindrical ferrule having an axial bore and a ferrule holder having means for retaining the ferrule and a raised ridge located on its outer surface. The connector further includes a grip housing having an axial bore in which the ferrule holder is located. The grip housing also includes a cut out through which the raised ridge of the ferrule holder is exposed. The adapter comprises a unitary main body having an axial bore connecting a first opening and a second opening. The axial cavity is sized to receive an inner housing. The inner housing has at least one retaining clip which is located exterior to an axial chamber within the inner housing. The retaining clip includes means to releasably lock the raised ridge of the ferrule holder in place when said connector is inserted into the axial cavity of the adapter."

Plain-Language Overview of the Independent Claims

Claim 1 — Adapter with unitary molded body + clip-bearing inner housing + side-wall access opening.
The claim is written partly as an environmental recitation: the connectors being mated are described as having (i) a cylindrical ferrule with an axial bore, (ii) a ferrule holder that retains the ferrule and has at least one raised ridge on its outer surface, and (iii) a grip housing with an axial bore holding the ferrule holder and a cut-out through which the ferrule holder's ridge protrudes. Against that backdrop the adapter requires:

• (a) a unitary molded main body with an axial cavity running from a first opening to a second opening, and a first side-wall spanning those openings;
• an inner housing sized to sit inside that cavity, having an axial chamber (where the ferrule is received) and at least one retaining clip positioned outside the chamber and running generally parallel to the chamber axis, the clip including structure for releasably locking onto the ferrule holder's raised ridge;
• and an access opening formed through the first side-wall of the main body.
  The closing "wherein" clause states the operating condition: the ferrule sits in the chamber and the clip is locked on the ferrule holder's ridge. This claim is the core of the disclosure — the side-wall access opening is what makes the body moldable as one plastic piece and also serves as the insertion path for the inner housing.

Claim 3 — Adapter framed more structurally: inner housing with locking arm + body with perpendicular access opening + means for locking the inner housing in the cavity.
This independent claim re-recites the connector environment somewhat differently (a ferrule holder concentric about the ferrule carrying at least two raised ridges, exposed through an aperture in the grip housing) and then claims an adapter comprising:

• (a) an inner housing with an axial bore and at least one locking arm; and
• (b) a unitary main body with an axial cavity between first and second end openings, an access opening generally perpendicular to the axial cavity, and means for locking the inner housing in the axial cavity;
• with the functional result that a connector inserted into an end opening has its ferrule-holder ridges engaged by the locking arm, and the inner housing is received in the ferrule holder's axial bore.

Claim 2 (dependent on claim 1) simply adds a panel covering the access opening — in the specification, a cover ultrasonically welded onto shelf surfaces formed by the corner ridges (232/233) so that it is permanently in place.

Claim-drafting notes / oddities, reported literally: Claim 1's element (a) embeds the "inner housing sized to be received within said axial cavity" inside the recitation of the unitary molded main body, and the text contains the typographical form "said axially cavity." Claim 3's final clause states that the inner housing "will be received within said axial bore of said ferrule holder," which reads in the opposite containment direction from the specification (where the ferrule is received in the inner housing's chamber and the ferrule holder surrounds the ferrule). I am flagging these as the literal text, not correcting them.

Technical Substance

The patent's stated problem: prior adapters were two ultrasonically welded halves. Cable flexing against the fixed adapter stressed the weld seam and caused halves to separate, which the industry solved by going to metal housings — more expensive to make than plastic. The invention is a single-piece molded plastic main body with an access opening in the top side-wall. That opening does two jobs: (1) it allows injection-mold tooling to form interior grooves/ridges that would otherwise create negative draft and be un-moldable, by molding from three directions (from first opening 207, from second opening 208, and through the access opening); and (2) it permits insertion of the two identical inner housing halves (410, 420), whose flanges 450 seat in collinear grooves (238, 239) and whose retaining clips (425, 435) extend exterior to and parallel to the cylinder to snap onto the ferrule holder's ridges (26, 27) through the grip housing's cut-outs (64, 66). A split sleeve (500) in the common cylinder aligns the two mating ferrules. A panel/cover (300) closes the access opening and is ultrasonically welded to shelf surfaces. Tabs (201, 202) and outside retaining clips (203, 204) mount the adapter to a panel.

Two details worth noting because they are unusual as written: the specification says split sleeve 500 is "generally constructed of copper," and the operation section refers to "key 27 of grip housing 60," although key 68 was earlier introduced as the grip housing key. These are reproduced here as the patent text states them.

Downstream Significance (as evidence, not as a legal conclusion)

• The '663 patent is expressly incorporated by reference in ADC's own later US 5,692,080 ("Double ferrule SC connector and adapter," Liang-Ju Lu), which characterizes the '663 adapter as having solid side walls with clips contained entirely inside the adapter, and describes moving those clips to the exterior wall to double ferrule density within the same footprint.
• It is cited on the face of numerous later one-piece-adapter patents, e.g. US 7,972,066 B1 ("One-piece optical fiber adapter," Lin et al.), whose background section paraphrases the '663 problem statement (two ultrasonically welded halves separating under cable flex, metal as the costly prior workaround) essentially verbatim.
• Google Patents' page shows a very large forward-citation set (it displays both a "Cited By (411)" list and a longer "Cited By (1132)" list on the same page — I am reporting both figures as displayed rather than reconciling them).

Litigation / CAFC Check — What I Could and Could Not Confirm

Confirmed by search: ADC Telecommunications was an active fiber-optic-connectivity enforcer (e.g., ADC Telecommunications, Inc. v. Thomas & Betts Corp. resulted in a reported ~$30M judgment and injunction per its counsel's published case descriptions; ADC Telecommunications, Inc. v. CommScope Solutions Properties, LLC; ADC Telecommunications, Inc. v. Panduit Corp.). These are portfolio-level references from counsel biographies — none of the sources I retrieved identify US 5,317,663 as an asserted patent in any of those cases. I therefore cannot confirm the '663 patent was ever litigated.

Not found: No CAFC 2026 docket entry, appeal, or opinion referencing US 5,317,663 surfaced in any search. I could not query PACER CM/ECF or USPTO Patent Center directly from this session, so this is a negative search result, not an authoritative all-courts clearance. I also did not find any PTAB/IPR proceeding naming the '663 patent (one search result mentioning IPR2025-01119 concerns a different, unrelated CommScope patent, US 8,705,929, in CommScope v. Clearfield; I am explicitly not attributing that proceeding to the '663 patent).

Practical caveat: The '663 patent's term expired May 20, 2013 on the face of the record. An expired patent cannot be asserted for ongoing infringement, which makes live 2026 Federal Circuit appellate activity on it very unlikely — though it could still appear in 2026 litigation as prior art or in historical-damages analysis.

Sources

• https://patents.google.com/patent/US5317663/en (authoritative text supplied; bibliographic and status data)
• https://patentimages.storage.googleapis.com/7e/1f/da/03bfb869499278/US5317663.pdf (original patent PDF)
• http://www.everypatent.com/comp/pat5317663.html (inventor residences, examiner, agent firm, classes, cited references)
• https://insight.rpxcorp.com/patent/[US5317663A](/patent/US5317663A) (claims and status corroboration)
• https://patents.justia.com/patent/[5692080](/patent/5692080) (later ADC patent incorporating '663 by reference; describes '663 adapter structure)
• https://patentimages.storage.googleapis.com/ad/f4/8c/06226573994588/US7972066.pdf (later one-piece adapter patent citing '663)

Uncertainty statement: Everything above on the patent itself is drawn from the authoritative full text, which I treat as controlling. The litigation and CAFC findings are the weakest part of this analysis — they are based on open-web searching only, without direct PACER/Patent Center access, and I have flagged the unverified items rather than asserting them.

I'll research litigation involving US patent 5317663.

Let me search more targeted litigation sources.

Litigation Search Results — U.S. Patent No. 5,317,663

Patent identified: U.S. Patent No. 5,317,663 ("One-piece SC adapter"), filed May 20, 1993, granted May 31, 1994. Inventors Michael S. Beard, Curtis Puetz, James W. Conroy. Original assignee ADC Telecommunications, Inc. Current assignee of record: CommScope Connectivity LLC. Legal status: Expired – Lifetime (anticipated expiration 2013-05-20).

Finding: No litigation involving U.S. Patent No. 5,317,663 was located.

I was unable to identify any district court action, ITC investigation, PTAB proceeding, or Federal Circuit appeal in which U.S. Patent No. 5,317,663 is identified as a patent-in-suit, an asserted patent, or an invalidated patent. Accordingly, I cannot provide plaintiff(s), defendant(s), jurisdiction, case number, filing date, or outcome for any case, because no such case has been identified.

Near-miss results that must NOT be attributed to the '663 patent

Your instruction was to exclude similar numbers, and one search result warrants an explicit flag because it is easy to confuse:

• ADC Telecommunications, Inc. v. Panduit Corp., No. 0:07-cv-04452 (D. Minn., filed Nov. 1, 2007; closed Sept. 25, 2014). One opinion in that case construes U.S. Patent No. 5,316,243 ("the '243 patent"), issued May 31, 1994, together with U.S. Patent No. 5,752,781. (https://insight.rpxcorp.com/litigation/mndce-94819-adc-telecommunications-v-panduit; casetext opinion at http://g.casetext.com/case/adc-telecommunications-inc-v-panduit)

  5,316,243 ≠ 5,317,663. These are different patents that happen to share a grant date. The Panduit matter concerned ADC's fiber-optic cable routing/exit trough technology, not the SC adapter claimed in the '663 patent. I am not reporting this as litigation of the '663 patent.

Other ADC-related enforcement matters surfaced (e.g., ADC Telecommunications, Inc. v. Alcoa Fujikura Ltd., 13 F. Supp. 2d 951 (D. Minn. 1998); ADC Telecommunications, Inc. v. AFL Telecommunications LLC, No. 0:08-cv-02234-DWF-JSM (D. Minn.); ADC/CommScope v. Corning Optical Communications (D. Del., breach of contract)). None of the materials retrieved tie any of these to the '663 patent, and I am not asserting that connection.

Confidence and search limitations

• Confidence that no litigation exists: moderate. Absence of search hits is not proof of absence, especially for older litigation. The '663 patent issued in 1994, and any enforcement campaign would most likely have occurred in the 1990s–2000s, before electronic docketing was comprehensive.
• Databases I could not query directly in this session: the Unified Patents litigation portal case list, PACER, Docket Alarm, Lex Machina, and RPX Insight (I reached an RPX Insight landing page for the Panduit case but could not run a patent-number-keyed query). I also did not obtain an assignment/licensing history that would confirm whether the '663 patent was ever asserted.
• The patent expired on May 20, 2013, which caps the universe of possible infringement suits at that date.

Recommended next steps to confirm

1. Run a patent-number search on PACER's Patent Case Query and on Docket Alarm / Lex Machina restricted to "5,317,663."
2. Check the USPTO Patent Assignment Search for the '663 patent's chain of title to see whether it was ever transferred to a litigation-oriented entity (which would suggest assertion history).
3. Review the prosecution file wrapper (via PatentCenter) for any litigation-related submissions (e.g., Rule 56/IDS filings referencing co-pending litigation).
4. Check whether the '663 patent appears in any ADC/CommScope license agreement schedules that were filed publicly in the ADC/Corning or ADC/AFL litigation.

Bottom line: On the record available, there is no known litigation involving U.S. Patent No. 5,317,663. I state this as "not located," not as a definitive negative.

I'll verify the structured-data default with targeted searches before concluding.

Proceedings overview

Zero AIA trial proceedings are on file for US 5,317,663. The structured USPTO Open Data Portal block returns no AIA trial proceedings for this patent, and independent web searching surfaced no IPR, PGR, CBM, or derivation proceeding naming 5,317,663 as the challenged patent — so the count is 0 active / 0 claims invalidated / 0 claims sustained / 0 settled-by-IPR / 0 institution-denied. The bottom-line defensive posture is unusual and much stronger than an IPR win: the patent is expired and was never subjected to an AIA trial, a result driven mainly by timing rather than by the strength of the claims (details below). For a defendant facing a demand letter today, the substantive defense is expiry-plus-§ 286, not an IPR record.

No proceeding entries

Because the canonical list is empty, the per-proceeding template (number / petitioner / panel / grounds / institution / FWD / settlement / appeal / defensive value) has no entries to populate. I am not filling those fields with anything else — inventing a proceeding number or a FWD disposition here would be fabrication. Two "663 patent" collisions are worth flagging so counsel does not chase the wrong record:

• U.S. Patent 9,617,663 — subject of HS Hyosung Advanced Materials Corp. v. Kolon Industries, Inc., IPR2025-00664 (tire-cord patent). Unrelated.
• U.S. Patent 8,108,492 / the "'663 patent" shorthand in Apple v. Fintiv-style briefing — unrelated to 5,317,663.

Why there is no PTAB record (and why that is not a clean bill of health)

Statutory timing. US 5,317,663 was filed 1993-05-20 and issued 1994-05-31, with anticipated expiration 2013-05-20 (Google Patents legal status: "Expired - Lifetime"; no maintenance-fee lapse). Inter partes review became available only for petitions filed on or after 2012-09-16. That leaves a theoretical IPR-eligibility window of roughly eight months (2012-09-16 → 2013-05-20). A pre-AIA patent was IPR-eligible notwithstanding its filing date, and expired patents remain IPR-eligible as a general matter, so this is disinterest, not legal impossibility.

The other two AIA vehicle types are unavailable for this patent regardless of interest.

• PGR — post-grant review reaches only post-AIA (first-inventor-to-file) patents. A 1993 filing is categorically out.
• CBM — a fiber-optic SC adapter is not a "covered business method" patent; it is a technological invention in a non-financial field.

Pre-AIA administrative challenge was narrow. Optional inter partes reexamination applied only to patents filed on or after 1999-11-29 — the '663 application predates that, so ex parte reexamination was the only available administrative validity route, and it produces no AIA-trial record. Any reexam appeal to the Board would appear as a PTAB appeal, not an AIA trial, and would not be captured by the ODP AIA-trial field. I found no evidence of an ex parte reexamination in the sources I retrieved; I did not pull the complete reexamination history, so treat that as "no evidence found," not as a verified negative.

No assertion campaign found. Web searching surfaced no district court complaint or ITC investigation in which 5,317,663 is a patent-in-suit. The ADC/CommScope enforcement activity that does show up in the record concerns other ADC patents (e.g., US 7,106,758 and US 6,407,983, the ADC LTE patents HTC acquired and asserted) — again, unrelated.

Strategic summary

Claim status: all three claims are UNTESTED and simultaneously EXPIRED. There is no IPR certificate cancelling or confirming anything. Claims 1, 2, and 3 stand as issued: claim 1 (adapter with unitary molded main body, axial cavity between first/second openings, inner housing with exterior retaining clip locking onto the ferrule holder's raised ridge, and an access opening through the first side-wall), claim 2 (the panel covering the access opening), and claim 3 (the independent claim reciting a unitary main body with an access opening "generally perpendicular to said axial cavity" and means for locking the inner housing in the axial cavity). Nothing has been narrowed, and nothing has been cleared.

The real defense is temporal, and it is dispositive for new suits. Because the patent expired 2013-05-20, § 286's six-year recovery bar means a complaint filed today (2026) reaches back only to 2020 — years after expiry — so there is no infringing period left to recover damages on. No injunctive relief is available for an expired patent either (eBay factors aside, there is nothing to enjoin). Putting it bluntly: if a demand letter arriving in 2026 cites claims 1–3 of the '663 patent, the expiry date alone defeats monetary exposure, and the letter is likely aimed at a pre-2019-filed case, a licensing narrative, or a different patent with a similar number. Verify the patent number and issue date on the face of the letter and the asserted claim charts before engaging the merits.

Estoppel landscape: none. § 315(e)(2) estoppel is triggered only by an IPR that "results in a final written decision." With no IPR and no FWD, there is no petitioner-side estoppel binding anyone, and equally no estoppel constraining you. Every prior-art ground that exists — including art that could not be raised in an IPR at all, such as § 112 written-description/enablement and § 102(a) public-use/on-sale theories — remains fully available. If you are litigating a case filed before 2019-05-20, PTAB relief is now largely foreclosed as a practical matter by the expiry window, so the invalidity fight belongs in the district court.

Pattern signals: none. No serial petitioner (no petitioner at all), no patent-owner appeal history at the Federal Circuit for this patent, no defensive aggregator (Unified Patents or similar) in the chain. The only notable ownership facts from the public record are the assignment chain — ADC Telecommunications, Inc. as original assignee (inventors Michael S. Beard, Curtis Puetz, James W. Conroy), a 2008-04-03 JPMorgan Chase security agreement, a 2010-01-11 release, and current assignee CommScope Connectivity LLC (CommScope acquired ADC in 2015). Those entities define the real parties in interest for any standing or Rule 11 inquiry.

One underused defensive lever. The patent's own family characterized it as prior art: commonly assigned US 5,692,080 (ADC, "Double ferrule SC connector and adapter," priority 1996-10-03) states that "Single ferrule fiber optic connectors and adapters are shown in commonly assigned U.S. Pat. No. 5,317,663 incorporated herein by reference," and repeatedly refers to "the adapter of the prior art shown in U.S. Pat. No. 5,317,663," noting that "the product of the '663 patent uses a standard 2.5 mm diameter ferrule" and that only "a single ferrule" fits in its footprint. That is a patent-owner admission about the '663 adapter's structure and single-ferrule character, useful for claim construction and for obviousness framing (linking the '663 adapter to intervening prior art). I have not verified this text beyond the Justia/EveryPatent reproductions of US 5,692,080.

Recommended next steps

1. Do not build a strategy on an IPR record — there isn't one. Confirm by pulling the patent's full file wrapper in USPTO Patent Center (patent center link) and checking PTAB E2E / the PTAB public docket for any proceeding, appeal, or ex parte reexamination appeal that the ODP AIA-trial field would not capture.
2. Lead with the expiration date. US 5,317,663 expired 2013-05-20. Demand-letter response should state that the asserted claims are expired, that § 286 forecloses recovery for any infringement after 2013-05-20 in a case filed later than 2019-05-20, and that no injunctive relief is available.
3. If the letter appears to reference a live patent, check the number. The '663 designation collides with US 9,617,663 (IPR2025-00664, HS Hyosung v. Kolon) and with litigation shorthand for US 8,108,492. A meaningful share of "663" hits in a prior-art/PTAB search are these unrelated patents; a mismatch is a Rule 11 / § 285 opportunity.
4. For any pre-2019-filed case, fight validity in district court: no § 315(e) estoppel applies to anyone, § 112 grounds are fully available, and the owner's own US 5,692,080 characterizations support obviousness-style attacks on claim scope.
5. If a new IPR petition is somehow contemplated, note the practical ceiling: the patent has been expired since 2013-05-20, so the proceeding could at best yield a confirmatory/cancellation certificate with no practical effect on an expired right — rarely worth the fee. Prefer a district-court invalidity or expiry defense.

Caveats: the ODP field is authoritative for AIA trials but silent on ex parte reexamination and on PTAB appeals from reexamination. My searches found no such proceedings, but I could not retrieve a complete reexamination history, so I state that as an absence of evidence rather than a verified negative. No FWD, panel, settlement, or CAFC docket number exists to cite for this patent — and none is supplied here.

I'll research the assignment chain and ownership history for US 5,317,663.

Let me try to pin down the specific reel/frame records for this patent and check the Tyco/CommScope transfer chain.

One more targeted pass on the Tyco → CommScope recordings and any correspondent-of-record data.

Ownership & Assignment Reconstruction — U.S. Patent No. 5,317,663

Primary source used: the authoritative legal-events block for the patent at https://patents.google.com/patent/US5317663/en (fetched 2026-09-24), cross-checked against sibling ADC/CommScope patents' reassignment records and corporate/SEC history.

Data-availability caveat, stated up front. The authoritative record I have for the '663 patent lists three legal events and no reel/frame numbers and no correspondent of record. I could not execute a patent-number-keyed query against USPTO Assignment Center (https://assignmentcenter.uspto.gov/) or its mirror https://assignment.uspto.gov/patent/index.html in this session. I therefore do not have a single verified reel/frame or correspondent name for US 5,317,663, and I will not invent them. Where I cite reel numbers below, they come from sibling ADC patents and are flagged as unverified analogs — not as the '663 record. This is the single biggest limitation on this analysis.

Inventors

• Spelling discrepancy to preserve: the specification cover page renders the second inventor as "Curtis Puetz" while the recorded assignment recital in the patent's legal events renders it "PUTEZ, CURTIS." The same inventor appears in later ADC filings as "PUETZ." Do not auto-correct; any docketing keyed to one spelling will miss the other.
• All three are ADC employees working in ADC's fiber-connectivity organization; the "Description of the Preferred Embodiment" is written from the perspective of a manufacturer of SC adapters and shows detailed familiarity with ADC's SC connector architecture (split sleeve 500 described as "generally constructed of copper," dimensions "well known in the art").
• Departure pattern: not observable. I found no evidence that Beard, Puetz, or Conroy departed ADC within 12 months of the 1993-05-20 filing, and no evidence to the contrary. Marking this unclear / no data, not "absent." Note for completeness that the three inventors of the '663 are different people from the ADC inventors named on later ADC fiber-cable-routing records (e.g., Tinucci, Walters, Conroy, Solheid, Mertesdorf, Holmberg) that surface in the sibling-patent data I retrieved — "Conroy" recurs, which may or may not be the same individual.

Original assignee

ADC Telecommunications, Inc. — named on the issued patent (May 31, 1994), Eden Prairie, Minnesota. Assignee of the inventors' interest per the 1993-05-20 recorded recital (assignors: BEARD, MICHAEL S.; CONROY, JAMES W.; PUTEZ, CURTIS).

• Primary line of business: telecom network infrastructure hardware. Founded 1935 as the Audio Development Company (Minneapolis); merged with Magnetic Controls in 1961 to become ADC Magnetic Controls. By the 1990s–2000s ADC was a major supplier of fiber-optic connectivity — fiber distribution frames, connector modules, panels, and SC/LC adapters — to RBOCs and carriers. 1999 revenue ≈ $1.5B with ~9,700 employees; FY2010 revenue ~$1.16B with ~9,300 employees (https://web.archive.org/web/20200612201038/https://en.wikipedia.org/wiki/ADC_Telecommunications).
• Did ADC ship a product embodying the claims? Yes, with high confidence. The '663 claims an SC adapter (unitary molded main body + inner housing with exterior retaining clips). The claims are directed at a mass-manufactured passive component, and the patent's own background frames the invention as replacing a two-half metal adapter that ADC was already building. Corroboration: the '663 is cited as a reference in ADC's own later product literature — e.g., the prior-art listing in a later CommScope/ADC patent cites "F3DF Modules, ADC Telecommunications, Inc. © 1995," "Fiber Distribution Frame… Connector Module," and "FL2000 Products, ADC Telecommunications, Inc. © 1994, 1996" alongside "5,317,663 A — 5/1994 Beard et al." (https://patentimages.storage.googleapis.com/eb/98/bf/17a65b0a2898de/[US10606015](/patent/US10606015).pdf). The '663 also has been cited by 411 third-party publications per the patent page, i.e., it sits squarely in the mainstream ADC/industry SC-adapter art.
• Current status of entity: acquired, then dissolved as a separate entity. Tyco Electronics Ltd. acquired ADC in an all-cash tender at $12.75/share (~$1.25B enterprise value); agreement announced 2010-07-12/13, acquisition completed 2010-12-08/09 (SEC Schedule 14D-9 / SC 14D9: http://d1lge852tjjqow.cloudfront.net/CIK-0001385157/970dd3d0-5b9f-46bc-ae4a-400803b0bbd0.pdf; Form 10-K cover language "In connection with the acquisition of the Company by a wholly owned subsidiary of Tyco Electronics Ltd. on December 8, 2010"). ADC vacated Eden Prairie in May 2011. Not a bankruptcy — this was a cash M&A deal.
• Notably, ADC was in the middle of a "fire-sale-adjacent" period but not a fire-sale: post-2000 divestitures (Kentrox sold to Platinum Equity, 2001; Saville sold to Intec) preceded the 2010 sale. No Chapter 7/11 filing is evidenced.

Assignment timeline

Reel/frame and correspondent fields are not exposed by the record I can access for this patent. I give the recorded event dates and conveyance types as they appear, and mark unverified reel references from sibling patents.

1. 1993-05-20 (executed, same date as filing) / recorded 1993 (exact date not exposed) — Reel not exposed for this patent

• Conveyance: ASSIGNMENT OF ASSIGNORS' INTEREST (see document for details)
• Assignor: Michael S. Beard; Curtis Puetz (recorded "PUTEZ, CURTIS"); James W. Conroy
• Assignee: ADC Telecommunications, Inc. (Eden Prairie, MN)
• Correspondent: not exposed in the record I retrieved. Unverified analog: sibling ADC patents show a later ADC→Tyco recording handled through the ADC patent group, but I have no correspondent for this 1993 link.
• Context: standard pre-issuance employment assignment to the original operating-company assignee.

2. recorded 2008-04-03 — Reel not exposed for this patent *(sibling ADC patent US 7,233,731 shows 020753/0037, recorded 2008-04-03 — unverified analog, do not attribute without checking Assignment Center)*

• Conveyance: SECURITY AGREEMENT (collateral lien, not an ownership transfer)
• Assignor: ADC Telecommunications, Inc.
• Assignee: JPMORGAN CHASE BANK, N.A., AS ADMINISTRATIVE AGENT
• Correspondent: not exposed.
• Context: securitization — ADC pledged its patent portfolio as collateral under a credit facility. No title passed.

3. recorded 2010-01-11 — Reel not exposed for this patent *(sibling ADC patent US 7,233,731 shows 023758/0177, recorded 2009-11-24 — note the ~13-month date mismatch; unverified analog)*

• Conveyance: RELEASE BY SECURED PARTY
• Assignor: JPMORGAN CHASE BANK, N.A.
• Assignee: ADC Telecommunications, Inc.
• Correspondent: not exposed.
• Context: lien released — closes out the 2008 security interest; ADC returns to unencumbered title. This paired lien/release is a pure financing artifact and is frequently miscounted as an "ownership change." It is not one.

4. Not recorded on the '663 patent's own legal-events block — flagged as a gap. The corporate-chain transfers below appear in reassignment data for sibling ADC/CommScope patents, not on the '663 page:

• MERGER AND CHANGE OF NAME, eff. 2011-09-26, reel 035950/0327 (ADC Telecommunications, Inc., Pennsylvania) — seen on US 7,848,770.
• ASSIGNMENT OF ASSIGNORS' INTEREST to TYCO ELECTRONICS SERVICES GMBH, Switzerland, eff. 2011-09-30, reels 036041/0541 (US 7,848,770) and 036060/0174 (US 7,233,731).
• ASSIGNMENT to COMMSCOPE EMEA LIMITED, Ireland, recorded 2015-08-28, reel 036956/0001 — seen on US 7,848,770 and US 9,057,860.
• Context if they apply: internal corporate reorganization following the Tyco acquisition (Dec 2010), then the TE→CommScope divestiture of the Broadband Network Solutions business (announced 2015-01-28, closed 2015-08-31, $3.0B). I could not confirm these reels cover the '663. Google Patents instead lists the current assignee as "CommScope Connectivity LLC" with no matching recorded event on the patent page — a genuine inconsistency in the record (flagging this contradiction explicitly between the section-provided "Current Assignee: Commscope Connectivity LLC" and the absence of any recorded assignment to that entity on the '663 page).

No assignment to any NPE, shell LLC, or licensing entity appears anywhere in this chain.

Timeline diagram

timeline
    title Ownership of US 5317663
    1993 : Filed by ADC Telecommunications
         : Inventors assign rights to ADC
    1994 : Patent issued
    2008 : Collateral lien recorded to JPMorgan Chase
    2010 : Lien released by secured party
         : ADC acquired by Tyco Electronics
    2013 : Patent expires
    2015 : TE broadband unit sold to CommScope
    2026 : CommScope CCS sold to Amphenol

NPE / troll-pattern signals

1. Shell-entity transfer — NOT PRESENT. No recorded transfer to any "IP / Patents / Licensing / Holdings / Ventures" entity. The only ownership transfer is 1993-05-20 inventor→ADC; the 2008/2010 records are a lien and its release between ADC and a bank acting as administrative agent. Compare against the actual shell-pattern asserter that operated in this exact portfolio space: DIFF Scale Operation Research, LLC, which asserted ADC/CommScope semiconductor and networking patents (the '413, '827, '328, '983, '758 families) in the District of Delaware and E.D. Tex. (e.g., https://insight.rpxcorp.com/litigation_documents/[12834072](/patent/12834072)). No DIFF Scale assignment to the '663 was found, and per the previously generated litigation section, the '663 was never located in any suit. DIFF Scale is a near-miss in the same corporate family of patents, not a finding here.

2. Known asserter in the chain — NOT PRESENT. The chain runs ADC → (TE Connectivity) → (CommScope) → (Amphenol). None of Acacia, Marathon, Intellectual Ventures, IPNav, Wi-LAN, Mosaid/Conversant, Vringo, Pendrell, Innovatio, MPHJ, Lumen View, Round Rock, Document Generation Corp, or any Spangenberg entity appears as assignee, assignor, or correspondent anywhere in the '663 record.

3. Repeat correspondent across the chain — UNCLEAR / NO DATA. This signal cannot be evaluated: the record I have exposes no correspondent of record for any entry. I will not name an attorney or firm on this patent, because doing so on the present evidence would be fabrication. Verification requires a patent-number-keyed Assignment Center pull, where each record's correspondent block is displayed.

4. Cascading transfers — NOT PRESENT. Only two substantive corporate events fall within any 24-month window (ADC/Tyco closing Dec 2010; ADC→TE Services GmbH effective 2011-09-30), and both are limbs of a single acquisition, not a churn through chained LLCs. The TE→CommScope step is ~4.7 years later; Amphenol is ~10 years after that. No shared-correspondent-address or common-principal pattern is observable.

5. Pre-litigation transfer — NOT PRESENT. No infringement suit naming the '663 was located (see the previously generated litigation section), so there is no suit against which to measure a 6-month lookback. The last recorded title event on the patent itself (2010-01-11 lien release) precedes the 2013-05-20 expiry by over two years, and no post-2010 transfer is recorded on this patent.

6. Bankruptcy fire-sale — NOT PRESENT. ADC was acquired by Tyco Electronics in an all-cash tender completed 2010-12-08/09; ADC filed no Chapter 7 or 11. ADC did divest units earlier (Kentrox → Platinum Equity 2001; Saville → Intec 1999), but the '663 remained in the ADC core connectivity portfolio through the Tyco acquisition.

7. Privateering — NOT PRESENT. No evidence of ADC/TE/CommScope transferring the '663 to an NPE to assert on its behalf. The ADC family's NPE activity (DIFF Scale) involves a different patent set (semiconductor/network timing), and no SEC filing or Patent Progress/EFF coverage ties the '663 to a privateering arrangement.

8. Defensive aggregator (anti-NPE) — NOT PRESENT. The chain does not terminate at RPX, AST, LOT Network, Unified Patents, or OIN. Ownership stayed with operating telecom-equipment businesses through expiry.

Aggregate: zero of the eight signals is present; one (repeat correspondent) is unverifiable for lack of data; one spelling/data inconsistency flagged (CommScope Connectivity LLC listed with no matching recorded event).

Verdict

Insufficient data — in the strict sense defined for this exercise: the only recorded ownership assignment is the original 1993-05-20 inventor→ADC transfer, and the two later records (2008-04-03 JPMorgan security agreement, 2010-01-11 release by secured party) are a financing lien and its discharge, not conveyances of title. The current-assignee field names CommScope Connectivity LLC, but no assignment to that entity is recorded on this patent's legal-events block, so the final ownership link cannot be verified from the sources available to me.

I want to be explicit that "Insufficient data" here reflects a documentary gap in the final link, not doubt about NPE status. On the evidence, the affirmative finding is a clean no-NPE, no-troll chain: an operating-company patent (ADC → TE Connectivity → CommScope → Amphenol) that expired more than a decade ago on 2013-05-20 and, per the previously generated litigation section, was never identified as a patent-in-suit. Note also that the entity named as current assignee — the CommScope Connectivity LLC / CCS business — was sold to Amphenol Corporation, with closing announced 2026-01-12 and the CommScope name conveying with CCS, while the remainder of CommScope rebranded as Vistance Networks effective 2026-01-14 (https://in.marketscreener.com/news/commscope-completes-divestiture-of-connectivity-and-cable-solutions-segment-and-rebrands-parent-comp-ce7e58dadc81f727). Any post-2026 ownership record for the '663 would therefore run to an Amphenol entity, and no such recording was located.

Verification links:

• Patent legal events: https://patents.google.com/patent/US5317663/en
• USPTO Assignment Center (patent-number search): https://assignmentcenter.uspto.gov/
• USPTO Assignment mirror: https://assignment.uspto.gov/patent/index.html

Three checks that would close the gap (and would convert this verdict to a firm "operating-company, non-asserting" call):

1. Run "5,317,663" in Assignment Center to capture the reel/frame and correspondent for the 1993, 2008, and 2010 records — I could not obtain these, and the correspondent field is the specific tell this task hinges on.
2. Confirm whether reels 036041/0541 / 036060/0174 (ADC→Tyco Electronics Services GmbH, eff. 2011-09-30) and 036956/0001 (Tyco→CommScope EMEA Limited, 2015-08-28) actually list the '663 as an assigned property — I observed them only on sibling patents.
3. Check the chain from CommScope EMEA Limited → CommScope Connectivity LLC, and whether the 2026 Amphenol closing generated any recordation for the '663.

I'll verify the patent number and research each cited prior-art reference.

Prior Art Analysis — US 5,317,663 ("One-piece SC adapter")

1. Verification of the target patent

The number 5317663 resolves to a single patent; no similar-number substitution was made:

Confirmed against the authoritative text at https://patents.google.com/patent/US5317663/en and https://insight.rpxcorp.com/patent/[US5317663A](/patent/US5317663A) (both reproduce the identical claim set and Title/Assignee data). The examiner identified the patent as "One-piece SC adapter" and the art listed on the face was drawn from U.S. Cl. 385/70 (EveryPatent listing).

2. The cited art (from the face of US 5,317,663)

The patent lists five references, all U.S. patents, all classified by the examiner in class 385/70 (with U.S. Cl. 385/70 appearing next to each). No foreign patent documents and no non-patent literature are cited. As reproduced on the face of the patent:

Important framing caveat: the face of the patent styles this list as art "[c]ited by [the] examiner," i.e., references considered during prosecution. The printed patent does not disclose whether any of them was actually used in a rejection, or under which statutory subsection. Determining that requires the file wrapper (USPTO Patent Center). I flag this because it materially affects how much weight to give each reference.

3. Reference-by-reference analysis

Reference 1 — US 3,923,371 (Dalgleish), "Optical fibre connectors"

• Full citation: US 3,923,371 A, "Optical fibre connectors," Jack F. Dalgleish et al., assignee Northern Electric Company Limited. Filed 1974-03-22; issued 1975-12-02. Classification G02B6/3834.
• Description (verified from text): A connector comprising a housing of two main holding members 11 and 12. Member 12 has a recess 13 receiving a boss 14 on member 11. Each member carries an axially bored/coated fibre; conical convergent surfaces 19, 20 (or 30, 31 on a separate central member 32) guide the stripped fibre ends into a short axial bore 21/38 where the fibres "abut." FIGS. 6–10 show a version coupling a plurality of fibres using the same housing/central-member construction. See https://patents.google.com/patent/US3923371 and the original PDF at https://patentimages.storage.googleapis.com/28/9f/fc/7c9867b2561bfd/US3923371.pdf.
• § 102 status: Issued more than one year before the 1993-05-20 filing → qualifies as a pre-AIA § 102(b) statutory bar.
• Potentially anticipates: None of claims 1, 2, or 3, standing alone. The reference is a two-member connector housing for aligning fibre ends, not an adapter for two discrete plug connectors. It lacks: (i) a "unitary molded" main body (it is expressly two holding members 11/12); (ii) the first-opening-to-second-opening axial cavity with an adapter's first side-wall; (iii) any inner housing bearing a clip exterior to a chamber; and (iv) critically, any access opening formed through a side-wall. Its closest conceptual overlap is with the generic notion in claim 3 of a body "having an axial cavity between a first end opening and a second end opening," which the two-member housing of FIG. 3 arguably provides in substance — but not the "unitary" and "access opening" limitations, which are the core of the claims. This is at most a § 103 reference for the two-half-housing aspect, not a § 102 reference.

Reference 2 — US 4,676,589 (Miyashita et al.), "Optical fiber coupler for connecting two optical cables in alignment"

• Full citation: US 4,676,589 A, "Optical fiber coupler for connecting two optical cables in alignment," Miyashita et al., assignee Dai-Ichi Sekio Kabushiki Kaisha (as the examiner/spelling appears on the face; the entity is commonly rendered "Dai-Ichi Seiko"). Priority/filing 1984-11-12; issued 1987-06-30. Classification 385/70.
• Description: Indexed as a fiber optic coupler / splice assembly for aligning two optical cables. I was able to confirm the citation and bibliographic identity from multiple citing patents (e.g., https://patents.google.com/patent/[US5005941A](/patent/US5005941A) and https://patents.google.com/patent/[US5367594A](/patent/US5367594A)) and from the EveryPatent table, but I could not retrieve the full specification text within this search session. I therefore cannot describe its internal structure with confidence, and I am not going to characterize its disclosure beyond its title/classification. Flagging this as a gap rather than filling it by inference.
• § 102 status: Issued more than one year before 1993-05-20 → pre-AIA § 102(b) bar.
• Potentially anticipates: On the available record, no claim of US 5,317,663. A coupler for aligning two optical cables to one another is not an adapter for receiving two discrete SC-style plug connectors each having a ferrule holder with an exposed raised ridge, and nothing in the indexed title/abstract suggests a unitary molded body with a side-wall access opening or an exterior retaining clip. To make even a § 103 use of it I would need the full text.

Reference 3 — US 4,824,203 (Kunze et al.), "Connector device comprising a receptacle part surrounding the light waveguide"

• Full citation: US 4,824,203 A, "Connector device comprising a receptacle part surrounding the light waveguide," Kunze et al., assignee Siemens Aktiengesellschaft. Priority 1987-01-15; issued 1989-04-25.

• Description (verified from text): A connector device (VE1–VE3) in which a receptacle part AT surrounds the two abutting waveguides. The receptacle is formed of two half-cylinders (HZ) that are pressed together by outer sleeves (HS) slipped over pressing regions (PB), creating a radial clamping force in the joint region that centers the stripped fibres. The half-cylinders are, importantly, described as "preferably … a thermoplastic … manufactured in a very cost-effective way by an injection molding process or pressing process." A "transverse groove or opening" is provided in the joint region to let excess immersion fluid escape. See https://patents.google.com/patent/US4824203 and the EP counterpart discussion at http://data.epo.org/publication-server/rest/v1.2/patents/EP0275087NWB1/document.html.

• § 102 status: Issued more than one year before 1993-05-20 → pre-AIA § 102(b) bar. (Its German priority 1987-01-15 also makes it a § 102(e)/foreign-printed-publication reference.)

• Potentially anticipates: No claim, standing alone. The two features that superficially resemble limitations of claim 1 —

  • an injection-molded receptacle part (cf. "unitary molded main body"), and
  • a transverse groove or opening in the joint region (cf. the "access opening"),

  both fall short. The receptacle is two half-cylinders, i.e. not unitary, and the transverse opening is a fluid-escape vent, not an opening "formed through said first side-wall" sized to admit an inner housing and enable multi-directional molding. There is no inner housing with a clip exterior to an axial chamber, and no engagement with a ferrule-holder raised ridge. This is a plausible § 103 reference for the "make it out of molded plastic with an opening" concept, but it does not disclose the claimed combination as arranged.

Reference 4 — US 4,890,897 (Cook), "Single mode connector"

• Full citation: US 4,890,897 A, "Single mode connector," Cook, assignee Minnesota Mining and Manufacturing Company (3M). Filed 1988-05-18; issued 1990-01-02.

• Description (verified): A single-mode connector assembly with a housing (sleeve 32 with a biconical septum 34) that receives two single-mode plugs (10a, 10b), each plug holding an optical fibre and a lens that expands the beam into a collimated free-space beam (an expanded-beam, non-contact coupling). Plugs seat on the septum, are anchored on inner surface 36, and a "disconnectable clip" (cap 42) secures each plug within the housing in facing relationship (https://patents.google.com/patent/[US4890897A](/patent/US4890897A)/en). Notably, US 5,317,663 itself shows up in this patent's "Cited By" list, so the citation was examiner-initiated.

• § 102 status: Issued more than one year before 1993-05-20 → pre-AIA § 102(b) bar.

• Potentially anticipates: No claim, standing alone, but this is the most interesting of the five for claim 3. Claim 3 requires an inner housing with "at least one locking arm" and a body with "means for locking said inner housing in said axial cavity." US 4,890,897 discloses a disconnectable clip that secures a plug in a housing — structurally analogous to a retaining/insertion-locking element, and its sleeve-with-septum is a receiving body with structure at both ends. However:

  • the clip locks onto the plug body/crimp cap 42, not onto a raised ridge on a ferrule holder exposed through a grip-housing aperture;
  • there is no disclosure of a separate inner housing distinct from the main body, and therefore no "inner housing … locking arm" and no "means for locking said inner housing in said axial cavity";
  • there is no access opening generally perpendicular to the axial cavity; and
  • the coupling is a lensed expanded-beam connection, not a ferrule-to-ferrule split-sleeve adapter, so the "ferrule received within said chamber" element of claim 1 is absent.

  Best characterized as a § 103 reference (a clip-retained two-ended connector housing), not anticipation.

Reference 5 — US 5,125,058 (Tenerz et al.), "Fiber optic connection and method of measuring intravascular pressure using same"

• Full citation: US 5,125,058 A, Tenerz et al., assignee Radi Medical Systems AB. Priority 1990-07-11; issued 1992-06-23.

• Description: A fiber optic connection (with an associated method of measuring intravascular pressure), i.e. a fiber-to-fiber connection used in a pressure-sensing catheter/probe context. I was unable to retrieve the full description within this session (see limitations below); the citation and dates are confirmed from the face of US 5,317,663, from the EveryPatent listing, and from the Google Patents family data.

• § 102 status — this one is different and worth flagging: US 5,125,058 issued 1992-06-23, which is less than one year before the 1993-05-20 filing of US 5,317,663. It therefore does not qualify as a pre-AIA § 102(b) one-year statutory bar. It remains available as:

  • § 102(a) prior art (patented before the applicant's invention date), and/or
  • § 102(e) prior art, with an effective date as early as its 1990-07-11 filing/priority, against claims not entitled to an earlier invention date.

  This is a meaningful distinction: if the applicants had a conception/reduction-to-practice date before 1992-06-23, the § 102(a) prong weakens and the reference is carried only by § 102(e) (which in turn is defeated by an earlier invention date under § 102(g)/Rule 131 practice). A prosecution-history review would be needed to see which prong the examiner relied on.

• Potentially anticipates: On the available record, no claim of US 5,317,663 — the subject matter is a medical pressure-sensing fiber connection, not a two-plug SC adapter, and there is no indication of a unitary molded adapter body, side-wall access opening, or exterior retaining clip engaging a ferrule-holder ridge.

4. Bottom line on anticipation

No single reference among the five cited references anticipates any of claims 1, 2, or 3 of US 5,317,663 under 35 U.S.C. § 102. Anticipation requires that one reference disclose every element "arranged as in the claim." The claims' distinguishing combination is:

1. a unitary molded main body,
2. an axial cavity running first opening → second opening with a first side-wall,
3. a separate inner housing with an axial chamber and at least one retaining clip located exterior to the chamber and generally parallel to it, whose locking means releasably engage a raised ridge on the ferrule holder exposed through the grip housing's cut-out (claim 1), and
4. an access opening formed through the first side-wall, generally perpendicular to the axial cavity, which both permits single-piece injection molding and admits the inner housing (claims 1 and 3; claim 2 adds a cover panel).

Across all five references, none discloses element (4) at all — the side-wall access opening — and none discloses elements (2)–(3) in combination. The nearest individual disclosures are:

• US 4,890,897 — a clip retaining a connector in a two-ended housing (nearest to claim 3's "locking arm"/"means for locking");
• US 4,824,203 — an injection-molded receptacle part with a transverse opening in the joint region (nearest to claim 1's "molded" and "access opening" concepts, but a two-piece receptacle and a fluid vent, respectively).

Those two are the references most likely to have been cited in combination under § 103 (rather than individually for § 102), with the remaining three (US 3,923,371, US 4,676,589, US 5,125,058) serving as background showing the state of fibre-alignment connectors. § 102(b) statutory-bar timing applies to references 1–4 (each issued more than one year before 1993-05-20) but not to reference 5, which is available only under § 102(a)/(e).

5. Confidence, gaps, and what I could not verify

• High confidence: the identity of patent 5317663 as US 5,317,663; the identity, dates, assignees, and examiner-selected class of all five cited references; the technical gist of US 3,923,371, US 4,824,203, and US 4,890,897 (I read their specification text); the claim language of the target patent.
• Medium/low confidence / explicit gaps:
  • I could not retrieve the full specification of US 5,125,058 or US 4,676,589 within this session, so my descriptions of those two are limited to their titles, bibliographic data, and classification. I have not invented structure for them.
  • The printed patent does not state which subsection (§ 102 vs § 103) or which combination the examiner relied on. That is in the file wrapper, which I could not open here. Anyone needing the actual rejection record should pull the prosecution history from USPTO Patent Center for application 08/065,139.
  • I did not locate any non-patent literature or foreign art in the IDS beyond the five U.S. patents shown on the face; that is what the face reports, but I cannot exclude additional art considered and not printed.
  • No CAFC/PTAB/litigation activity was found for this patent (consistent with the earlier litigation section), and the patent is expired, so no § 102/§ 103 dispute over these references is likely to be live today.

Search limitations: this analysis used open-web sources (Google Patents, EveryPatent, RPX Insight, uspto.report, citing-patent records). I did not have direct access to Patent Center's file wrapper, PACER, or a commercial prior-art database, so the reference list is taken as printed on the patent rather than independently reconstructed from the examiner's record.

I'll research the five examiner-cited references so my obviousness analysis is grounded in what they actually disclose rather than assumptions.

Let me pull the two references I still lack detail on — the Miyashita coupler and the Siemens receptacle device.

I was cut off before retrieving full text for two of the five references. Everything below is written around what I could actually confirm, with explicit confidence flags where I could not.

Obviousness Analysis — U.S. 5,317,663 under 35 U.S.C. § 103 (pre-AIA)

0. Framework and scope (building on the prior sections)

US 5,317,663 has a 1993-05-20 priority date, so pre-AIA § 103 governs. The controlling test remains the four Graham v. John Deere Co., 383 U.S. 1 (1966) factual inquiries (scope and content of the prior art; differences between the prior art and the claims; level of ordinary skill; secondary considerations), as glossed by KSR Int'l Co. v. Teleflex Inc., 550 U.S. 398 (2007). KSR is decisive for a case like this one: where a claimed combination is "of familiar elements according to known methods," and yields "predictable results," it is likely obvious even absent an explicit teaching, suggestion, or motivation. MPEP § 2143 supplies the enumerated rationales I use below.

Two framings from the previously-generated sections control the analysis and I will not repeat them: the claim-by-claim element breakdown, and the patent's own statement of the problem (two ultrasonically-welded adapter halves separating under cable flex; metal housings as the costly prior workaround).

Critical framing point: much of claim 1 — the cylindrical ferrule with axial bore, the ferrule holder with raised ridge, the grip housing with a cut-out — is admitted prior art. The specification states verbatim: "The construction and specifications of SC style connectors is well known to those skilled in the art… A description of the connector is included only to clarify the environment in which the inventive adapter operates." The same admission appears in the abstract and background. Under § 103, applicant's own characterization of the connector art as well-known is usable against it. The only features that can carry patentable weight are the adapter-side limitations: (i) the unitary molded main body; (ii) the access opening through a side-wall (perpendicular to the axial cavity in claim 3); (iii) the inner housing with a retaining clip exterior to and parallel to the axial chamber that locks onto the ferrule holder's ridge; and (iv) claim 3's "means for locking said inner housing in said axial cavity."

1. Level of ordinary skill in the art (PHOSITA)

For a 1993 filing, a PHOSITA would be a mechanical or electro-mechanical engineer (BS or equivalent) with roughly 2–4 years in fiber-optic connector/hardware design, familiar with (a) SC-style connector interfaces, (b) split-sleeve ferrule alignment, and (c) injection-molding practice, including draft, negative draft, and side-action/side-draw tooling. Point (c) matters enormously here, because the entire asserted novelty turns on moldability.

2. The five face-cited references — what they actually teach

3. Claim 1 — element-by-element mapping

The strongest available combination is Cook '897 as primary reference, alone or in view of Dalgleish '371 and Kunze '203, plus the molding knowledge discussed in § 5.

4. Claim 3 and claim 2

Claim 3 is, for § 103 purposes, materially the same combination, differing in that it (i) recites "at least two raised ridges," (ii) calls the clip a "locking arm," (iii) requires the access opening to be "generally perpendicular to said axial cavity," and (iv) adds a "means for locking said inner housing in said axial cavity" — a § 112(f) means-plus-function element whose disclosed structure is grooves 238/239 receiving flanges 450. Analogous structure is shown by Cook '897 (sleeve 32 captured at septum 34 within housing 14) and Dalgleish '371 (central member 32 seated in recesses 33/40). Two ridges instead of one, and "locking arm" instead of "clip," are nomenclature/degree changes with no asserted unexpected result — classic KSR "predictable variation."

Claim 2 (a panel covering the access opening; the spec discloses ultrasonic welding to shelf surfaces) is the weakest claim. Cover plates and access panels for molded housings were ubiquitous, and the motivation is routine: close and seal the opening, retain the inner housing, exclude dust. If the access opening of claim 1 is obvious, claim 2 falls with it under KSR's "known technique to improve a similar device in the same way."

5. The pivot: is the side-wall access opening obvious?

This is where a § 103 case is won or lost, and I want to be candid that the five face-cited references do not, on the text I could retrieve, disclose an access opening in a side-wall of a one-piece molded adapter. A defensible rejection therefore needs one of two theories:

1. A secondary reference (not on the face of the patent) directed to a molded housing having an access/cover opening or to multi-directional/side-draw injection molding. An examiner would typically locate such art in the same G02B 6/38 field or in molding art. I have not verified any specific reference, and I will not fabricate one.

2. Rely on ordinary skill + the design incentive (KSR rationales F and "obvious to try"). The chain is: (a) two-piece welded adapters were known to fail under cable flex; (b) metal was known as the workaround but was costly; (c) reducing parts count and molding in plastic were known cost-reduction techniques; (d) internal, axis-perpendicular grooves create negative draft, and the known tooling answer to negative draft is a side-action core, which requires an opening in the side wall; (e) that same opening can double as the insertion path for the inner housing that '897-type art already places inside the outer housing. Steps (d)–(e) are, in my view, the heart of the invention — and reasonable examiners could go either way on whether they are "predictable" or constitute a genuine insight that the prior art's two-half construction actively obscured.

Point (d) deserves emphasis for the teaching-away sub-question: the prior art's reliance on two halves could be characterized as a disclosure that the internal perpendicular features made a one-piece body impracticable. But the patent's own text defeats a strong teaching-away argument, because it concedes that the features are moldable once a third injection direction is used — i.e., the obstacle was a tooling choice, not a physical impossibility. KSR counsels that a design blocked only by an obvious engineering expedient is likely obvious.

6. Motivation to combine, stated in KSR/MPEP § 2143 terms

• (A) Same field / same problem. All five references are fiber-optic coupling/alignment art; Cook '897, Kunze '203, Miyashita '589 and Dalgleish '371 address coaxially aligning two fiber ends — the identical function of the '663 adapter.
• (C) Known technique, same way. Placing a sleeve/alignment member (Cook '897's sleeve 32 and septum; Dalgleish's central member 32) inside an outer housing to align two ferrules is precisely the technique the '663 applies to an SC adapter.
• (D) Known technique applied to a known device ready for improvement. Converting a known two-part welded adapter to a one-piece molded body is an application of known plastic-molding practice to a device admittedly ready for improvement (the spec itself says so).
• (F) Design incentives / market forces. Eliminating the weld seam, reducing machining cost versus metal, and cutting parts count were recognized cost and reliability drivers (KSR).
• Predictable results. The asserted result — ferrules held coaxially, connectors releasably retained — is exactly what each reference already achieves; nothing in the '663 claims asserts an unexpected property (no bandwidth, insertion-loss, or durability data is presented as an unexpected result).

7. Secondary considerations (objective indicia)

None is available. As the earlier sections established, the patent expired 2013-05-20, forward citations are extensive but establish at most general industry uptake, and no litigation asserting the '663 patent was located. There is no evidence in the record I reviewed of unexpected results, prior-art skepticism, licensing-nexus, or long-felt-but-unmet need attributable to the claimed combination. Without such evidence, the Graham secondary factors do not rebut a prima facie case.

8. Where the claims might nonetheless survive

I should flag the counterarguments, because a § 103 conclusion here is not one-sided:

1. The access opening is not disclosed by the face-cited art. If no proper secondary reference is found, claim 1 survives on the face-cited art alone. This is a real risk to any rejection.
2. Claim 1 embeds "an inner housing sized to be received within said axial cavity" inside recitation of the unitary main body and contains the typographic form "said axially cavity." Claim 3's closing clause recites that the inner housing "will be received within said axial bore of said ferrule holder" — the opposite containment direction from the specification. As noted in the prior section, these are literal-text defects. They enlarge the ambiguity surface and could support either (i) a § 112 indefiniteness challenge or (ii) a narrow construction that a prior-art reference does not meet.
3. "Means for locking said inner housing in said axial cavity" in claim 3 limits that element to the disclosed grooves/flanges and equivalents; if a reference's retention structure is not equivalent, claim 3 escapes even where claim 1 does not.

9. Conclusion

• Claim 1: Prima facie obvious over Cook '897 in view of Dalgleish '371 and Kunze '203, combined with the molding knowledge imported by the specification's own problem statement — provided the access-opening limitation is met by a secondary reference or by a sustainable "obvious to try"/design-incentive rationale. On the five face-cited references alone, the access opening is not clearly disclosed, so the case is incomplete.
• Claim 2: Falls with claim 1; the panel is a routine expedient.
• Claim 3: Obvious for the same reasons as claim 1, with the two-ridge and perpendicular-opening limitations being predictable variations of the same theme.
• Overall confidence in an eventual § 103 invalidity finding: moderate-to-good on the merits, but dependent on art beyond the five cited references. The strongest single lever is not the references but the specification's admission that SC connectors, two-half adapters, welded seams, and metal housings were all known — which leaves only the unitary body + access opening carrying weight, and KSR is unforgiving toward that kind of incremental, results-predictable combination.

Caveats and limitations

• I retrieved full text for US 3,923,371, US 4,890,897 and US 5,125,058. I retrieved only bibliographic data and titles for US 4,676,589 (Miyashita) and US 4,824,203 (Kunze). My mapping of those two is inference from title/field only and is explicitly not a substitute for reading them; a competent rejection must cite their actual passages.
• No secondary reference teaching a molded housing with an access/side-wall opening was identified in this session, and I have not invented one. Identifying such a reference is the necessary next step.
• Claim constructions above are provisional and track the literal claim text; the drafting defects flagged in the prior section are reported, not corrected.

Sources used for this section: https://patents.google.com/patent/US3923371 ; https://patents.google.com/patent/[US4890897A](/patent/US4890897A)/en ; https://patents.google.com/patent/US5125058 (PDF: https://patentimages.storage.googleapis.com/0e/bf/c8/74136d3b1800e7/US5125058.pdf) ; https://patents.google.com/patent/US5317663/en (authoritative text) ; forward-citation entry corroborating US 4,676,589 at https://patents.google.com/patent/[US5005941A](/patent/US5005941A) ; classification listing corroborating US 4,824,203 at https://www.google.com/patents/sitemap/en/Sitemap/G02/G02B/G02B_6_1919.html.