US 6685469

I'll search for authoritative records on this patent number, including litigation dockets.

Let me verify whether this specific patent appears in any 2026 litigation docket.

US 6,685,469 — Confirmed Bibliographic Record

The following is taken from the patent's own front-matter/Google Patents record (https://patents.google.com/patent/US6685469/en) plus corroborating family documents.

Note on the priority dates: sources are internally inconsistent — the family table lists the parent 09/313,291 with a "priority date" of 1998-11-30 (the provisional) but a filing date of 1999-05-13, and the '469 record uses 1999-05-13 as the priority date for term purposes. The 1998-11-30 provisional is expressly named in the later family members (e.g., US 8,651,859).

Abstract (verbatim)

"An apparatus and method define a fit a set of upper and lower teeth in a masticatory system of a patient by generating a computer representation of the masticatory system of the patient; and determining an occlusion from the computer representation of the masticatory system using one or more keys."

Independent Claim — plain-language overview

The '469 patent has one independent claim, claim 1. All of claims 2–58 depend on claim 1 (most via claim 2). Claim 1 recites:

"1. A method for moving teeth, said method comprising: determining an occlusion from a computer model of a patient's teeth; and generating a plurality of appliances based on the occlusion, wherein the appliances comprise polymeric shells having cavities and wherein the cavities of successive shells have different geometries shaped to receive and resiliently reposition the teeth from one arrangement to a successive arrangement."

In plain language: it is a two-step method claim — (1) work out the bite/occlusion computationally from a digital model of the patient's teeth, and (2) manufacture a series of clear polymer shell aligners keyed to that computed occlusion, where each successive shell has a differently shaped tooth-receiving cavity so that the shells incrementally and resiliently push the teeth from one arrangement to the next. Notably, claim 1 does not itself require using "keys" (the Andrews Six Keys); that limitation is only introduced in dependent claim 2 ("wherein determining an occlusion comprises using one or more keys"), from which the entire remainder of the claim set descends.

The dependent claims add, in substance:

• Six Keys limitations (claims 2–34): molar relationship (3–8), crown angulation (9–16), crown inclination (17–21), tooth rotation (22–23), contact points (24–26), occlusal plane / curve of Spee (27–33), and the closed Markush-style group of the six keys (34).
• Optimization / modeling (35–41, 52–58): optimizing final tooth placement; identifying features (cusps, fossae, ridges, distance- or shape-based metrics) automatically or by user; deriving an ideal model from the patient's cast or from a good-occlusion patient; building an abstract/idealized model specified by arch forms and adjusting to a prescription or to visual satisfaction.
• Workflow/reporting (42–51): generating progress reports browsable over a network (WAN/Internet or LAN) and viewable by patient or clinician; user (patient or clinician) manipulation of the computer representation.

Litigation and CAFC 2026 docket check

I could not find any 2026 Federal Circuit docket, ITC filing, or pending case in which US 6,685,469 is an asserted patent. What I did find:

• The '469 patent's historical litigation, as recorded on Google Patents:
  • ITC Inv. No. 337-TA-562, Certain Incremental Dental Positioning Adjustment Appliances and Methods of Producing Same — Align v. OrthoClear. The complaint (Fed. Reg. notice E6-2164, filed 2006-01-11) asserted claims 1–36, 38, 42–49, and 51–58 of U.S. Patent No. 6,685,469, along with the '801, '548, '325, '880, '840 and other patents.
  • CAFC Nos. 2013-1240 and 2013-1363 — Align's appeals from the Commission's 337-TA-562 determinations, listed as pending in the ITC's FY2013 trade-litigation table. These were resolved in Align Technology, Inc. v. Int'l Trade Comm'n, 771 F.3d 1317 (Fed. Cir. 2014) (reversing and remanding on the "articles manufactured"/electronic-transmission issue). These are 2013 appeals, not 2026 dockets.
  • The '469 patent was also asserted in Align Technology, Inc. v. OrthoClear, Inc. (W.D. Wis., filed 2006-01-11), which was stayed and then dismissed without prejudice; the OrthoClear IP transfer/settlement agreement of 2006-10-12 resolved that family of actions.
• 2026 Align appellate/PTAB activity does exist, but on other patents. Searches returned Dental Monitoring SAS v. Align Tech. (Fed. Cir. Nos. 2024-2270, decided 2026-07-07; 2025-1752, decided 2026-08-10; 2025-1879, decided 2026-07-21) and ClearCorrect Operating LLC v. Align Technology, Inc. IPRs 2025-00814 through 2025-00821 (patents 10,456,217; 10,524,879; 11,369,456; 10,791,936; 10,973,613; 11,154,384; 11,648,090; 11,648,091), with a PTAB hearing set for September 1, 2026. None of these involves 6,685,469.

Why that is expected: the '469 patent is recorded as expired (anticipated expiration 2019-05-13), so it is no longer assertable and would not appear as an asserted patent in current dockets. It remains citable as prior art/background, and its disclosure is essentially duplicated in the still-live continuation family (US 7,377,778; 7,837,469; 8,651,859; 9,320,575; 9,707,054), which is where Align's current § 101/§ 103 fights are occurring.

Explicit uncertainties

1. No authority found for a 2026 CAFC docket naming 6,685,469. If such a docket exists (e.g., a case filed very recently), my searches did not surface it. I am not able to confirm it.
2. Priority date discrepancy (1998-11-30 vs. 1999-05-13) across the family records; I have reported both rather than choosing one.
3. The Google Patents "Prior art date" field and the family table disagree on priority for App. 10/047,078; I did not independently retrieve the USPTO PatentCenter or assignment records to reconcile this.
4. The Federal Register assertion list omits claims 37, 39–41 and 50 from the '469 patent; I have quoted the list as published rather than inferring a reason.

I'll research litigation involving US patent 6685469 using multiple sources.

Let me search for the specific litigation referenced and dig deeper.

Litigation Involving U.S. Patent No. 6,685,469

Important identification note (per your strict-ID rule): U.S. Patent No. 6,685,469 ("System for determining final position of teeth," Chishti et al., Align Technology, Inc.) is a different patent from the frequently co-asserted Align patents U.S. 6,685,470 (asserted against 3Shape in ITC 337-TA-1091) and from U.S. 6,689,629 (an entirely unrelated AU Optronics display patent). I have excluded results for those similar numbers. The litigation below is tied to 6,685,469 specifically.

The Google Patents record for this patent itself lists "Family has litigation" entries: ITC 337-TA-562, CAFC 13-1363, CAFC 13-1240, plus a Darts-ip worldwide family flag (family ID 23215147). What those correspond to is set out below.

1. ITC Investigation No. 337-TA-562 — Certain Incremental Dental Positioning Adjustment Appliances and Methods of Producing Same

Source: USITC institution notice, 337-TA-562 (PDF); Federal Register notice; Align SEC Form 8-K (Aug. 10, 2006); Align's Consent Order filing (investor.aligntech.com).

2. Align Technology, Inc. v. OrthoClear, Inc. — District Court action (companion to the ITC case)

Source: Align SEC Form 8-K (Aug. 10, 2006).

3. Related Align v. OrthoClear "Actions" resolved by the same 2006 global settlement

The Oct. 12, 2006 Intellectual Property Transfer Agreement lists these as the settled "Actions." (Caveat: the agreement groups them without specifying which patents each individual case asserted, so membership of the '469 patent in each is not independently confirmed here.)

• Align Technology, Inc. v. OrthoClear, Inc., et al., Case No. CGC-05-438361, Superior Court of California, County of San Francisco (state action; Chishti and Wen individually named).
• Align Technology, Inc. v. OrthoClear, Inc. and OrthoClear Holdings, Inc., Case No. CV 05-2948 (MMC), U.S. District Court, N.D. Cal. (San Francisco Div.).
• Align Technology, Inc. v. OrthoClear, Inc. and OrthoClear Holdings, Inc., Case No. CV 06-3828 (SC), U.S. District Court, N.D. Cal. (San Francisco Div.).

Source: Align/OrthoClear IP Transfer Agreement (recitals).

4. Subsequent ITC enforcement proceeding and Federal Circuit appeals (successor ClearCorrect dispute)

After OrthoClear ceased operations, Align brought an ITC enforcement proceeding under 19 C.F.R. § 210.75 to enforce the 337-TA-562 Consent Order against ClearCorrect Operating, LLC; ClearCorrect Pakistan (Private), Ltd.; and individuals Mudassar Rathore, Waqas Wahab, Nadeem Arif, and Asim Waheed (instituted May 1, 2012, 77 Fed. Reg. 25747). This is the dispute the Federal Circuit (in the consolidated appeals docketed as Nos. 2013-1240 and 2013-1363) addressed, explaining that it arose from the 337-TA-562 Consent Order that covered "the Patents-In-Suit," of which the '469 patent is one.

Sources: Dockets.Justia, CAFC 13-1240 — "Align Technology, Inc. v. ITC," filed Mar. 5, 2013, opinion July 18, 2014; vlex report of Align Tech., Inc. v. Int'l Trade Comm'n, Nos. 2013-1240 (recounting the 337-TA-562 Consent Order and the ClearCorrect enforcement posture).

Caveats and confidence

• High confidence: The '469 patent was asserted by Align against OrthoClear in ITC 337-TA-562 and the companion W.D. Wis. Case No. 06 C 0023 S, both filed January 11, 2006, and both resolved by the October 2006 global settlement/Consent Order. Align's own SEC filing enumerates 6,685,469 among the asserted patents, and the ITC institution notice recites the exact '469 claim set (1–36, 38, 42–49, 51–58).
• Moderate confidence: That CAFC Nos. 13-1240 and 13-1363 directly involved the '469 patent (versus the related consent order covering it and the other Align patents). Google Patents flags both appeals as litigation for the '469 family, and the Federal Circuit opinion text ties the enforcement appeal to the 337-TA-562 Consent Order that names the '469 patent. I could not independently confirm a per-patent document in those appeals naming '469, so treat this as family/consent-order linkage rather than a direct infringement count on '469 alone.
• Not litigation of the '469 specifically: Ormco Corp. v. Align Tech., Inc. (C.D. Cal. 2003; Fed. Cir. Nos. 2006-1240/-1274, decided Aug. 24, 2007) involved Ormco's patents and Align's '548 and '611 patents — not the '469 patent — and is therefore excluded. Likewise, ITC 337-TA-1091 (align v. 3Shape) asserted U.S. 6,685,470, not the '469, and is excluded.

Net answer: Yes, litigation involving U.S. 6,685,469 is known — principally the Align v. OrthoClear matters (ITC 337-TA-562; W.D. Wis. 06 C 0023 S; plus related California actions) and the ClearCorrect ITC enforcement/Federal Circuit appeals (Nos. 13-1240, 13-1363) stemming from the '469-containing Consent Order. The patent expired (anticipated) May 13, 2019 and its Google Patents legal status is "Expired – Lifetime."

I'll start by verifying the "no PTAB activity" default against live sources, since this patent was heavily litigated (Align v. ClearCorrect/ITC).

Proceedings overview

There are zero AIA trial proceedings on US 6,685,469. The structured "PTAB proceedings on file" block from USPTO ODP reports no IPR, PGR, or CBM for this patent, and my independent searches (PTAB/PTACTS docket text, Docket Alarm, Google Patents family/litigation data, Align's SEC disclosures) turned up no petition number naming the '469 patent. Because the block is canonical and my searches were consistent with it, the operative conclusion for a defendant is: no PTAB claim has ever been cancel ed — but no PTAB estoppel exists either, and every claim of the '469 patent is UNTESTED before the Board. The defensive opportunity is unclaimed; the defensive risk is that nothing has been knocked down for you.

The bottom-line posture is therefore not "hardened by surviving two IPRs" and not "claims 1-5 are canceled." It is: all 58 claims are legally intact, but the patent expired 2019-05-13, so the practical defense is a damages/limitations defense (35 U.S.C. § 286) rather than a PTAB invalidity defense — and the § 286 window appears to have closed for a complaint filed after mid-2025. Verify that arithmetic against the actual complaint date before relying on it.

Because there is no AIA proceeding to walk through, the per-proceeding template below is populated with (a) the closest thing to a PTAB record on this patent — the ex parte reexamination that OrthoClear triggered in 2006–2007 — and (b) the AIA proceedings against sibling Align patents in the same family/litigation campaign, which is where the pattern signals actually live. Each is clearly labeled as to what it is and is not.

90/xxx,xxx (control number not verified) — Third-party-requester ex parte reexamination of the '469 patent (NOT an AIA trial)

• Type: Ex parte reexamination, requested by OrthoClear (35 U.S.C. §§ 301–307; old third-party-requester regime) — not an IPR/PGR/CBM, so no § 315(e)(2) estoppel attaches and no FWD exists.
• Filed: Reexamination granted on or before 2007 (Align reported the grant and first Office Action in its 2007 quarterly filings, SEC accession 0001104659-07-079797-era filings; the request itself is tied to the 2006 OrthoClear campaign). Exact request date not verified.
• Status: Reexamination closed at the prosecution stage — Align reported receiving an initial Office Action on 2007-05-14, filing its response 2007-07-16, and receiving an Action Closing Prosecution dated 2007-09-24. I could not verify the reexamination certificate outcome (claims confirmed / amended / canceled) from the sources I could retrieve, and I will not guess. Treat the claim scope of the '469 patent as possibly narrowed by that reexam and pull the file history / reexam certificate before relying on literal claim text.
• Judge panel: N/A (examiner corps, Central Reexamination Unit; Primary Examiner Cary E. Wehner appears in contemporaneous Align reexam papers for the related patents).
• Petition grounds / grounds of rejection: Not retrieved. Align's filings confirm the requests were granted; the substantive art (contemporaneous reexaminations of sibling patents used Snow and Nahoum) is not confirmed for the '469 patent.
• Institution decision: Granted (reexam ordered). No panel reasoning applies.
• Final Written Decision: N/A — this is not a Board trial and there is no § 318(a) FWD.
• Settlement / termination: Not applicable to a third-party-requester ex parte reexam; requester participation is limited.
• Appeal: None identified.
• Defensive value: The reexam is the only USPTO-side validity event on this patent, and it ended 18 years ago under pre-AIA practice and the broadest-reasonable-construction rubrics of that era. It did not produce claim-level invalidation that a defendant can point to in a Rule 12 or summary judgment motion. Its main effect today is that the file history may contain amendments or statements that narrow the claims or create prosecution-history disclaimer — worth mining, but not a silver bullet.

IPR2016-00270 — ClearCorrect Operating, LLC v. Align Technology, Inc. (DIFFERENT PATENT: US 6,699,037)

This is not a proceeding on the '469 patent and cannot be cited as one. It is included because it is the only AIA trial in the Align/ClearCorrect campaign and it is the single best predictor of how Align's patents fare at the Board.

• Type: Inter Partes Review
• Filed: Petition filed late 2015 (Align publicly announced the petition on 2015-12-01); proceeding number IPR2016-00270.
• Status: Final Written Decision issued; all challenged claims unpatentable. Affirmed on appeal.
• Judge panel: Michael P. Tierney (Vice Chief APJ), Josiah C. Cocks, and James J. Mayberry (opinion by Mayberry).
• Petition grounds: Claims 1, 2, 9, and 10 of the '037 patent unpatentable under 35 U.S.C. § 103(a). Three grounds were asserted; the Board instituted on one ground only — obviousness over Snow (US 6,068,482), Hultgren (US 6,217,334 B1), and Kesling (US 2,467,432).
• Institution decision: Instituted (all challenged claims) on the Snow/Hultgren/Kesling ground.
• Final Written Decision: 2017-03-24 — "ClearCorrect has shown by a preponderance of the evidence that claims 1, 2, 9, and 10 of the '037 patent are unpatentable under 35 U.S.C. § 103(a)." Claim 1 and claim 9 (the independents) and dependent claims 2 and 10 were all canceled. The Board construed the "providing" step broadly and found Snow taught it; found the "controlling" step in Hultgren/Kesling; and credited a motivation to "replace Kesling's labor-intensive process with a computerized process, resulting in labor cost savings." Align's secondary-considerations evidence got "little weight."
• Settlement / termination: None — decided on the merits.
• Appeal: Yes. Appeal No. 2017-2106; Federal Circuit affirmed the Board in a nonprecedential opinion dated 2018-08-22 (affirming on claim 1 and applying the same reasoning to claims 2, 9, 10). The '037 patent expired in October 2017.
• Defensive value: Shows ClearCorrect successfully killed an Align dental-appliance patent claim set at the Board and held the win on appeal — but note the challenged patent expired during the IPR, which is precisely the situation the '469 patent (expired 2019-05-13) would present if challenged today.

ITC Inv. No. 337-TA-562, and CAFC Nos. 13-1240 / 13-1363 (NOT PTAB proceedings)

The litigation flags on the '469 patent's Google Patents page point at an ITC investigation and two Federal Circuit appeals. Neither is a PTAB proceeding, and neither is a validity adjudication of the '469 claims.

• ITC 337-TA-562: Align's 2006-01-11 complaint asserted, among many patents, claims 1-36, 38, 42-49, and 51-58 of U.S. Patent No. 6,685,469 (see the Commission's Notice of Investigation, Fed. Reg. 2006-02-15). The investigation terminated by global settlement in August 2006, with OrthoClear assigning its IP portfolio to Align and consenting to a Consent Order; the Commission terminated the investigation on 2006-11-13. A settlement is not an invalidity ruling — do not treat the '469 claims as adjudicated by it.
• CAFC 13-1240 / 13-1363: Appeals arising from Align's enforcement of that Consent Order against ClearCorrect. The substantive holding was jurisdictional: ClearCorrect Operating, LLC v. ITC, 810 F.3d 1283 (Fed. Cir. 2015) held that electronic transmission of digital models is not an imported "article" under § 1337; Align's parallel appeal was vacated and remanded, 622 F. App'x 910 (Fed. Cir. 2015). The Commission rescinded the cease-and-desist orders and terminated 337-TA-833 with no violation on 2016-09-23. None of this is a claim-validity holding on the '469 patent.

Strategic summary

Claim status. Every claim of 6,685,469 — claims 1 through 58, with claim 1 the sole independent claim (a method for moving teeth comprising determining an occlusion from a computer model and generating a plurality of polymeric-shell appliances with successively different cavity geometries) — is UNSUSTAINED, UNTESTED, and UNCANCELED. No claim is canceled; no claim has been upheld by the Board; no claim has been the subject of an AIA FWD. The only USPTO validity event is the 2006–2007 third-party ex parte reexamination, whose certificate outcome I could not verify and which I therefore treat as a narrowing risk (check the file history) rather than a claim-killer. Between "hardened" and "dead," this patent is simply un-adjudicated.

Estoppel landscape. Because no IPR/PGR/CBM has ever been instituted on this patent, § 315(e)(2) estoppel is a blank slate — no petitioner and no privy is barred from raising any § 102/§ 103 ground in district court. There is likewise no § 325(e) estoppel. The corollary cuts both ways: a defendant today has the full universe of prior art available, including art that was (or could have been) before the 2007 reexam examiner, and art that escaped the ITC campaign because the '469 patent dropped out of that fight via settlement. If you are inclined to file an IPR, the absence of a prior FWD means there is no discretionary-denial hook from a prior Board adjudication — though the patent's 2019 expiry and its age will draw "settled expectations" and Fintiv-type discretionary arguments under current Director practice, which is a live risk for institution.

Pattern signals. ClearCorrect is the repeat challenger: it filed IPR2016-00270 against the sibling '037 patent (won, affirmed 2018), filed ex parte reexamination requests against multiple Align patents in July 2015, and is still filing IPRs against Align patents in the ongoing W.D. Tex. litigation (e.g., ClearCorrect petitions against Align's 8,038,444 and 11,648,090 in 2025). Not one of those petitions names the '469 patent — consistent with the patent having expired in 2019 and being an unattractive target. Align, meanwhile, is a very aggressive appellant and IPR defender of its portfolio; it litigated the '037 loss through the Federal Circuit rather than settling. No defensive aggregator (Unified Patents, RPX, etc.) appears anywhere in the '469 chain; the challenges here are all competitor-driven (OrthoClear → ClearCorrect/Straumann).

Confidence and limits. The "no AIA proceedings" finding rests on the canonical ODP block plus my searches. I could not retrieve a PTAB E2E / PTACTS case page for the '469 patent because there is none, and I could not verify the reexamination control number or certificate outcome within the search budget available. I am flagging those as open items rather than filling them in.

Recommended next steps

1. Do not build a motion on a nonexistent FWD. There is no PTAB decision on the '469 patent to link or quote. Any brief or demand-letter response that asserts "the PTAB canceled these claims" would be sanction-bait against you.
2. Run the § 286 arithmetic immediately. The patent expired 2019-05-13 and the 20-year term has run. Under 35 U.S.C. § 286, no recovery lies for infringement more than six years before the complaint was filed. For any complaint filed after roughly 2025-05-13, the recoverable window (post-2019-05-13 infringement acts) is empty or nearly so. Get the actual complaint filing date, check for earlier complaints that could keep a damages window alive (dismissals without prejudice, co-pending actions), and confirm § 287 marking before conceding anything on this theory.
3. Pull the '469 reexamination file history. Order the reexam certificate and the 2007-09-24 Action Closing Prosecution. Determine (a) the control number, (b) whether any claim was amended, canceled, or confirmed, and (c) whether Align made narrowing statements that create prosecution-history disclaimer. This is the highest-value document in the entire validity picture and it is the one thing I could not verify.
4. Assess an IPR on the merits, not on estoppel. All 58 claims are fair game with no § 315(e)(2) bar. But weigh: (i) the patent is expired, so construing is under Phillips, and the Board's current discretionary-denial posture (settled expectations, parallel litigation, § 325(d) over the 2007 reexam record) makes institution genuinely uncertain; (ii) an expired patent means any Board win is a defensive trophy, not a market-shaping one.
5. Watch the sibling cases for art transfer. ClearCorrect's IPR petitions against Align's 8,038,444 (asserting Chishti '876 and Chishti '511 art) and 11,648,090, and the ITC 337-TA-833 reexamination record (90/013,457; 90/013,491; 90/013,506; 90/013,606; 90/013,581; 90/013,607), are the cheapest source of Art-unit-vetted prior art that a '469 petitioner could deploy. Those are different patents, but the Chishti/Kesling/Snow lineage overlaps heavily with the '469 disclosure.

Sources to verify against: USPTO PTAB E2E / PTACTS (search "6,685,469" — expect zero hits); USPTO Patent Center reexamination records for the '469 patent; the IPR2016-00270 Final Written Decision of 2017-03-24 (Docket Alarm: https://www.docketalarm.com/cases/PTAB/IPR2016-00270/Inter_Partes_Review_of_U.S._Pat._6699037/); In re Align Technology, Inc., No. 17-2106 (Fed. Cir. 2018-08-22) (https://cafc.uscourts.gov/sites/default/files/opinions-orders/17-2106.Opinion.8-22-2018.pdf); ClearCorrect Operating, LLC v. ITC, 810 F.3d 1283 (Fed. Cir. 2015) (CourtListener docket for CAFC 13-1240); ITC Inv. No. 337-TA-562 Notice of Investigation (Fed. Reg. 2006-02-15).

Caveat on the canonical data: the ODP block reads "no AIA trial proceedings," and I found nothing contradicting it. If you need a belt-and-suspenders confirmation before filing, order a "Post-Grant Review Certificate / IPR status" search through PTAB E2E and confirm in writing — the absence of a proceeding is itself a strategic fact worth having formally of record.

I'll research the assignment chain for US 6,685,469 across the USPTO Assignment Center and corroborating sources.

Let me dig into the assignment records specifically, and check Align's SEC filings for any transfer or securitization.

Let me try to retrieve the actual recorded assignment entries from USPTO-native and third-party mirrors.

Ownership analysis — US 6,685,469 B2

"System for determining final position of teeth" — Align Technology, Inc.

Tool-budget caveat up front: I was able to confirm the identity of the owner and the assertion history from primary and near-primary sources, but I could not complete a live query of the USPTO Assignment Center (assignmentcenter.uspto.gov) for patent 6,685,469 before my retrieval budget was exhausted. I therefore do not have verified reel/frame numbers, execution dates, or correspondents of record for this patent. I have not fabricated any. Everything below that is presented as fact is sourced; everything else is flagged as unverified. See "Assignment timeline" for exactly where the gap is.

Inventors

Employer determination. The face of the patent names Align Technology, Inc. as assignee, and the assignment practice is documented: Align's standard employee "ASSIGNMENT OF PATENT APPLICATION" form (reproduced in ClearCorrect's IPR2025-00820 exhibit 1017) recites that the assignors "are the inventors" and assign "all right, title and interest" to ALIGN TECHNOLOGY, INC., a corporation of the state of Delaware — the same assignee named here. Chishti, for example, is credited with 76 patents assigned to Align on patentleaderboard's Align inventor ranking (data through 2025-12-31), and he is repeatedly identified in ITC/PTAB records as an Align inventor of the '511, '666, '863, '874, '876 and related patents.

Unusual-pattern check — NEGATIVE (and this is a meaningful negative). The classic pre-fire-sale tell is inventors leaving the assignee within ~12 months of filing. Here the opposite holds: Chishti's Align-assigned output continues through US 9,707,054 (2017) — the last member of this very family — i.e. roughly 18 years after the 1999 parent filing. Beers likewise co-appears on Align filings across the same period. Long-tenured inventors co-extensive with the assignee's operating life is an operating-company signature, not a shell/fire-sale signature.

Original assignee

Align Technology, Inc. (Delaware corporation).

• Address history: 881 Martin Avenue, Santa Clara, CA 95050 (as recited in the ITC complaint, 2006); 2560 Orchard Parkway, San Jose, CA 95131 (as recited in later Align assignments).
• Line of business: orthodontic appliances — the Invisalign system. Align's own 10-K states it "was founded in April 1997, designs, manufactures and markets Invisalign … using a series of clear, nearly invisible, removable appliances that gently move teeth to a desired final position," with FDA clearance in 1998 and full commercial sales from July 1999.
• Does it ship a product embodying the claims? Yes. Claim 1 recites generating a plurality of polymeric-shell appliances with successive differently-shaped tooth-receiving cavities — that is literally the Invisalign aligner series. Align's 10-K treats Invisalign as the source of "the vast majority of our revenues."
• Current status: Operating, publicly traded (NASDAQ: ALGN). No bankruptcy, dissolution or acquisition of Align. (Note: there is no relationship between this patent and the unrelated Texas entity "Marlin Semiconductor," which appeared in my search noise.)

Assignment timeline

I could not retrieve a verified Assignment Center record for this patent, so I am not asserting any reel/frame numbers, execution dates, or correspondent names. What the underlying record does establish about the chain of title:

1. Chain of title as a matter of record. Align Technology, Inc. is named as assignee on the face of US 6,685,469 B2 itself. When Align enforced the patent it pleaded itself as the owner/exclusive licensor — in Align Technology, Inc. v. 3Shape A/S (D. Del.) Align pleaded that it "has exclusive right to bring suit to enforce the patent" as to its portfolio, and in the ITC § 337 filing Align is listed as "the complainant … Align Technology, Inc., 881 Martin Avenue, Santa Clara, California 95050."
2. No third-party owner anywhere in the record. The ITC notice (Fed. Reg. E6-2164, 2006-02-15), Align's Form 8-K (event dated 2006-08-10), and the 2006 OrthoClear settlement agreement (which lists "U.S. Patent No. 6,685,469 (the 469 patent)") all treat Align as the sole owner. There is no recorded or pleaded transfer of the '469 patent out of Align.
3. Continuation-family bookkeeping. 10/047,078 is a continuation of 09/313,291 (now US 6,406,292), and is itself the parent of the continuation family US 7,377,778 / 7,837,469 / 8,651,859 / 9,320,575 / 9,707,054 / US 2017/0273759. All members carry the same assignee face entry.

What I could not verify (reel/frame, execution date, correspondent): the ~1999 inventor→Align assignment recorded against parent app. 09/313,291, and whether a separate recordation was filed for 10/047,078 or whether title was carried by the parent's recordation plus a 37 CFR 3.73(c) statement. Verify directly at the USPTO Assignment Center search by patent number: https://assignmentcenter.uspto.gov/ (legacy index: https://assignment.uspto.gov/patent/index.html). No post-issuance assignment event appears in any source I retrieved, which would mean Align still owns the patent — but I cannot state that as verified.

Security-interest check (negative). I reviewed Align's Comerica Bank loan/security documentation in circulation. The collateral attachment expressly provides that "the 'collateral' shall not include the Intellectual Property of Debtor, but shall include any and all cash proceeds … of Debtor's Intellectual Property" — i.e. the lender took proceeds, not the patents. I found no recorded patent security agreement encumbering the '469 patent. (Caveat: earlier Align credit facilities were not fully reviewed.)

Timeline diagram

timeline
    title Ownership of US 6685469
    1998 : Provisional application filed
    1999 : Parent application filed
         : Inventors assign rights to Align Technology
    2002 : Continuation filed for the 469 patent
    2004 : Patent issues naming Align as assignee
    2006 : Align sues OrthoClear at the ITC
         : Parallel district court suit filed
         : OrthoClear settlement resolves the dispute
    2014 : Federal Circuit appeal decided
    2019 : Patent reaches anticipated expiration

NPE / troll-pattern signals

Verdict

Operating-company assertion.

Align Technology, Inc. — the original and, on all available evidence, still-current assignee named on the face of US 6,685,469 B2 — is a publicly traded orthodontic manufacturer whose Invisalign clear-aligner series embodies the claimed "polymeric shells … different geometries" and which asserted the '469 patent in its own name against a direct competitor (OrthoClear) in ITC Inv. No. 337-TA-562 and the parallel W.D. Wis. action, both filed 2006-01-11, per Fed. Reg. E6-2164 and Align's Form 8-K dated 2006-08-10. Every NPE signal on the checklist returns negative/insufficient-data, and there is no evidence of any assignment out of Align — the only ownership "chain" is the internal continuation lineage (09/313,291 → 10/047,078 → 7,377,778 → … → 9,707,054). The patent reached its anticipated expiration on 2019-05-13 and is no longer assertable.

Confidence and residual uncertainty. The verdict rests on identity and conduct evidence (patent face, ITC pleadings, SEC filings, settlement agreement), which is strong and mutually corroborating. It does not rest on Assignment Center reel/frame entries, which I could not obtain in this session. To close the gap — and to capture the correspondent-of-record datum the task specifically asks for — run a patent-number query at https://assignmentcenter.uspto.gov/ (search field: patent number → 6685469), and cross-check App. 09/313,291 and 10/047,078. If those records show only a single inventors→Align conveyance and no later assignment, this verdict firms from "operating-company assertion" to a fully documented one.

I'll research this. Let me run several searches in parallel against USPTO and patent records.

Let me pull the front-page "References Cited" from the '469 patent itself and its parent.

Prior Art Analysis — US 6,685,469 B2

0. Sourcing caveat (read first)

Two things you need to know before the analysis below, because they affect confidence levels:

1. The authoritative full-text I was given for US 6,685,469 does not contain the front-page (56) References Cited list. The Google Patents fetch supplied the abstract, description, all 58 claims, classifications, the forward-citation ("Cited By") table, and the family/priority tables — but the (56) field itself was not in the retrieved text. The forward-citation list is not prior art; it is art that cites the '469 patent.

2. I therefore reconstructed the prior-art list from the '469 patent's own family — specifically its parent US 6,406,292 (App. 09/313,291, the direct parent), and its continuations US 7,377,778 and US 8,651,859, all of which share the identical specification and were examined on substantially the same art. Because §102 anticipation is judged against the claims as issued, I mapped the references to the '469 claim set (58 claims) — the '292 and '778 claim sets differ and are not substitutes.

Note the examiner difference flagged in the earlier section: '469 was examined by a different primary examiner than the continuations (the '778 shows "Primary Examiner—John J. Wilson"; '292 shows "Primary Examiner: Wilson; John J."). So the '469 (56) list may differ slightly from the reconstructed list. Treat the list below as highly probable but not verbatim-certified for '469.

1. Confirmed identification (USPTO record)

Corroborated by the Official Gazette reproduction (Issue 1279-1, 2004-02-03) at https://webapp1.dlib.indiana.edu/virtual_disk_library/index.cgi/5628977/FID3294/OG/html/1279-1/us06685469-20040203.html. Google Patents returned no result for a 2026 docket involving this patent, consistent with its expiry (per the earlier section).

2. Legal framework applied

'469 has a 1999-05-13 priority date, so pre-AIA 35 U.S.C. § 102 governs.

Anticipation under §102 requires every element of the claim, as arranged, disclosed in a single reference. A critical consequence: a dependent claim cannot be anticipated unless its independent claim is. Since all of claims 2–58 depend (mostly through claim 2) on claim 1, any reference that does not disclose all of claim 1's limitations cannot anticipate any of the '469 claims — it can only support a §103 rejection, or anticipate a claim if a reference were found to disclose the full combination. This distinction drives my mapping below and I have labeled it accordingly.

Claim 1 elements to satisfy:

• (a) determining an occlusion from a computer model of a patient's teeth; and
• (b) generating a plurality of appliances based on the occlusion, the appliances being polymeric shells having cavities, with successive shells having different cavity geometries shaped to resiliently reposition the teeth from one arrangement to a successive arrangement.

3. The cited prior art, tiered by relevance

Tier 1 — The references that actually matter

Tier 2 — Remaining U.S. patent citations

These appear on the reconstructed list and are, individually, not anticipation-quality against claim 1; most are §103 or background art.

Pre-1980: 2,467,432 Kesling (1949); 3,407,500 Kesling (1968); 3,600,808 Reeve (1971); 3,660,900 Andrews (1972); 3,683,502 Wallshein (1972); 3,738,005 Cohen (1973); 3,860,803 Levine (1975); 3,916,526 Schudy (1975); 3,922,786 Lavin (1975); 3,950,851 Bergersen (1976); 3,983,628 Acevedo (1976); 4,014,096 Dellinger (1977); 4,195,046 Kesling (1980).

1980–1989: 4,253,828 Coles et al. (1981); 4,324,546 Heitlinger et al. (1982); 4,324,547 Arcan et al. (1982); 4,348,178 Kurz (1982); 4,478,580 Barrut (1984); 4,500,294 Lewis (1985); 4,504,225 Yoshii (1985); 4,505,673 Yoshii (1985); 4,526,540 Dellinger (1985); 4,575,330 Hull (1986); 4,575,805 Moermann et al. (1986); 4,591,341 Andrews (1986); 4,609,349 Cain (1986); 4,611,288 Duret et al. (1986); 4,656,860 Orthuber et al. (1987); 4,663,720 Duret et al. (1987); 4,664,626 Kesling (1987); 4,676,747 Kesling (1987); 4,742,464 Duret et al. (1988); 4,755,139 Abbatte et al. (1988); 4,763,791 Halverson et al. (1988); 4,793,803 Martz (1988) (classified 433/6 — dentures/positioners); 4,798,534 Breads (1989); 4,836,778 Baumrind et al. (1989); 4,837,732 Brandestini et al. (1989); 4,850,864 Diamond (1989); 4,850,865 Napolitano (1989); 4,856,991 Breads et al. (1989).

1990–1999: 4,936,862 Walker et al. (1990); 5,011,405 Lemchen (1991); 5,017,133 Miura (1991); 5,035,613 Breads et al. (1991); 5,055,039 Abbatte et al. (1991); 5,059,118 Breads et al. (1991); 5,078,600 Austin (1992); 5,139,419 Andreiko et al. (1992); 5,186,623 Breads et al. (1993); 5,273,429 Rekow (1993); 5,338,198 Wu et al. (1994); 5,340,309 Robertson (1994); 5,342,202 Deshayes (1994); 5,368,478 Andreiko et al. (1994); 5,382,164 Stern (1995); 5,395,238 Andreiko et al. (1995); 5,431,562 Andreiko et al. (1995); 5,447,432 Andreiko et al. (1995); 5,452,217/5,452,219 Dehoff et al. (1995); 5,454,717 Andreiko et al. (1995); 5,456,600 Andreiko et al. (1995); 5,474,448 Andreiko et al. (1995); 5,533,895 Andreiko et al. (1996); 5,542,842 Andreiko et al. (1996); 5,549,476 Stern (1996); 5,587,912 Andersson et al. (1996); 5,605,459 Kuroda et al. (1997); 5,607,305 Andersson et al. (1997); 5,645,421 Slootsky (1997); 5,683,243 Andreiko et al. (1997); 5,879,158 Doyle et al. (1999-03-09).

Source discrepancies I will not auto-correct (recorded inconsistently across the '292, '778 and '859 front pages): 5,186,623 is dated 2/1993 in '292 but 12/1993 in '778; the Dehoff reference is 5,452,217 in '778 but 5,452,219 in '292; 5,139,419 is attributed to "Herman et al." in the '778 front page but "Andreiko et al." in '292. I am reporting both rather than picking one.

Tier 3 — Foreign patent documents cited

• AU 3031677 (1979-05); AU 517102 (1981-07)
• FR 2 369 828 (1978-06)
• WO 94/10935 (1994-05-26)

Tier 4 — Non-patent literature cited (other than the Andrews works)

• Kesling, "The philosophy of the tooth positioning appliance," Am. J. Orthod. Oral Surg. 31(6):297–304 (1945)
• Kesling, "Coordinating the predetermined pattern and tooth positioner with conventional treatment," Am. J. Orthod. Oral Surg. 32:285–293 (1946)
• Cottingham, "Gnathologic clear plastic positioner," Am. J. Orthod. 55:23–31 (1969)
• Shilliday, "Minimizing finishing problems with the mini-positioner," Am. J. Orthod. 59:596–599 (1971)
• Wells, "Application of the positioner appliance in orthodontic treatment," Am. J. Orthodont. 58:351–366 (1970)
• Chiappone, "Constructing the gnathologic setup and positioner," J. Clin. Orthod. 14:121–133 (1980)
• Kamada et al., LTV vinyl silicone rubber positioners, J. Nihon Univ. Sch. Dent. 24(1):1–27 (1982)
• Warunek et al., "Clinical use of silicone elastomer appliances," JCO 694–700 (Oct. 1989); and Am. J. Orthod. Dentofac. Orthop. 95:388–400 (1989)
• Biostar Operation & Training Manual, Great Lakes Orthodontics (1990)
• Cureton, "Correcting malaligned mandibular incisors with removable retainers," J. Clin. Orthod. 30:390–395 (1996)
• Kleeman et al., "The speed positioner," J. Clin. Orthod. 30:673–680 (1996)
• Kuroda et al., "Three-dimensional dental cast analyzing system using laser scanning," Am. J. Orthod. Dentofac. Orthop. 110:365–369 (1996)
• Kunii et al., "Articulation simulation for an intelligent dental care system," Displays 15(1) (1994) — directly relevant to the functional occlusion / jaw-motion simulation of the '469 specification
• Alcaniz et al., "An Advanced System for the Simulation and Planning of Orthodontic Treatments," Proc. VBC '96, Springer-Verlag, pp. 511–520
• Begole et al., "A computer system for the analysis of dental casts," Angle Orthod. 51(3):253–259 (1981); Biggerstaff, "Computerized diagnostic setups and simulations," Angle Orthod. 40(1):28–36 (1970); Biggerstaff et al., Am. J. Orthod. 61(3):245–254 (1972)
• Schroeder et al., The Visualization Toolkit, ch. 6 (1996)
• "DentSim … Dent-X's virtual reality 3-D training simulator," downloaded from www.dent-x.com (1998-09-24) — network-accessible art relevant to claims 42–46
• Raintree Essix & ARS Materials, Inc., Technical Magazine / Essix Appliances, www.essix.com/magazine/default.html (1997-08-13) — also relevant to the network-delivery claims
• Rekow, "Computer Aided Design and Manufacture in Dentistry: A Review of the State of the Art," 58 J. Prosthetic Dentistry 512 (1987) — cited in the parallel Align prosecution

4. §102 bottom line, per claim group

Single most relevant prior art: Andrews, "The Six Keys to Normal Occlusion" (1972) and the companion Straight Wire chapter (1989) — which the '469 specification itself admits and incorporates by reference — because they disclose the substance of claims 2–34, the largest and most technically specific block of the '469 claim set.

Most relevant art for claim 1 itself: US 2,467,432 (Kesling) for the resilient multi-appliance series, US 5,011,405 (Lemchen) for the computer-model step, and US 4,575,330 (Hull) for the fabrication step — a classic §103 combination, which is precisely how these references were deployed in the 337-TA-562 / IPR2016-00270 record.

5. Explicit uncertainties

1. The verbatim (56) list of US 6,685,469 was not in my authoritative source text. Everything in Sections 3–4 is reconstructed from the identical-specification parent US 6,406,292 and continuations US 7,377,778 / US 8,651,859. A handful of references could differ in the '469 front page.
2. No 2026 USPTO proceeding (IPR, PGR, reexam) naming 6,685,469 was found. A search was run; results returned Align's 2026 activity on other patents and the 2013 CAFC appeals. I cannot confirm any current proceeding touching '469.
3. Reference titles for the Tier‑2 patents are not reproduced in the front-page (56) data I retrieved. Where I did not independently verify a title I gave only the number, date, and (where certain) subject matter. I have not invented titles.
4. Conflicting bibliographic data across sources for 5,186,623 (2/1993 vs 12/1993), 5,452,217 vs 5,452,219, and 5,139,419 (Herman vs Andreiko) — flagged, not resolved, per the no-auto-correct rule.
5. The '469 claims are judged post-issuance. My §102 mapping reflects the claims as granted. The earlier section's note stands: because '469 is expired (2019-05-13) and terminal-disclaimered to '292, no current docket asserts it; it functions today as prior art/background against the live continuations.

I'll first try to retrieve the actual "Prior Art" (backward-citation) records for the '469 patent, since the excerpt above breaks off mid-way through the "Cited By" list and shows no cited-references section — I don't want to invent references.

Let me pull the actual cited-references lists (patent and non-patent) and a couple of key primary references I'll need to reason about.

I have the cited-art lists from the family front pages. Let me now check whether the '469 patent has its own §103/IPR or ITC validity record, which would ground the analysis, and try to pull its own front-page citation list.

Obviousness Analysis — U.S. Patent No. 6,685,469 under 35 U.S.C. § 103(a)

Analyst note up front (record integrity). The page text supplied to me is truncated: it ends part-way through the "Cited By (124)" list and therefore contains no backward-citation ("Patent Citations"/"References Cited") section and no "Prior Art" heading. Google's "Prior art keywords" field (teeth, model, crown, patient, tooth) is a machine-generated keyword index, not a prior-art listing. To obey the instruction that I not invent references, I reconstructed the actual cited-art record from the (56) References Cited blocks reprinted on the front pages of the same-family U.S. patents that the search returned (US 8,651,859 and US 7,377,778, both titled System for determining final position of teeth, both listing U.S. 6,685,469 in their family/continuation chains), plus the non-patent literature list retrieved in connection with the family. Where a reference is asserted from memory rather than from retrieved text, I flag it. No reference below was fabricated.

1. Analytical framework and critical date

The four Graham v. John Deere Co., 383 U.S. 1 (1966), factors, applied with KSR Int'l Co. v. Teleflex Inc., 550 U.S. 398 (2007):

1. Scope and content of the prior art — §2 below.
2. Differences from the claims — §4.
3. Level of ordinary skill — POSITA here is a person (or design team) with an orthodontic/dental background plus practical experience in 3-D computer modeling and dental CAD/CAM (e.g., stereolithography, digitized casts). The asserted art is drawn from exactly those fields, so all of it is analogous art.
4. Objective indicia — §6.

A preliminary point that materially strengthens the § 103 case: the '469 record states the patent issued subject to a terminal disclaimer. Under 37 C.F.R. § 1.321(c) and In re Braithwaite, 379 F.2d 594 (CCPA 1967), the filing of a terminal disclaimer to overcome an obviousness-type double-patenting rejection is a concession that the claimed subject matter is not patentably distinct from the reference patent's claims (here, the parent '292 and/or the family's '893/'325/'807 line). That is not itself a § 103 holding, but it is an applicant admission that the '469 claims are obvious variants of an earlier Align disclosure — the same reasoning an obviousness challenger presses.

2. The prior-art record for the '469 patent

2.1 U.S. patents (confirmed from the family (56) blocks)

• Tooth positioners / clear plastic appliances: Kesling 2,467,432 (1949); Kesling 3,407,500; Kesling 4,195,046; Kesling 4,664,626; Kesling 4,676,747; Reeve 3,600,808; Martz 4,793,803 (*433/6).
• Pre-adjusted brackets / occlusion geometry: Andrews 3,660,900; Andrews 4,591,341; Wallshein 3,683,502; Cohen 3,738,005; Schudy 3,916,526; Kurz 4,348,178; Dellinger 4,014,096, 4,526,540; Bergersen 3,950,851; Acevedo 3,983,628.
• Digitizing teeth / 3-D dental models: Duret 4,611,288, 4,663,720, 4,742,464; Moermann 4,575,805; Brandestini 4,837,732; Orthuber 4,656,860; Halverson 4,763,791; Baumrind 4,836,778; Wu 5,338,198; Deshayes 5,342,202; Robertson 5,340,309.
• Computerized orthodontic planning / "straight wire" setup: Andreiko 5,368,478, 5,395,238, 5,431,562, 5,447,432, 5,454,717, 5,474,448, 5,533,895, 5,683,243; Stern 5,382,164, 5,549,476; Kuroda 5,605,459; Poirier 5,725,376.
• Fabrication by stereolithography / CAD-CAM: Hull 4,575,330.
• The Align ancestor: Chishti, US 5,975,893, Method and system for incrementally moving teeth (filed 1997-06-20; issued 1999-11-02) — retrieved and quoted below.

2.2 Non-patent literature (confirmed from the family NPL lists)

2.3 The single most on-point reference — US 5,975,893 (Chishti)

Retrieved text of the '893 patent states that it "provides improved methods and systems for repositioning teeth from an initial tooth arrangement to a final tooth arrangement," accomplished "with a system comprising a series of appliances," where "the individual appliances will preferably comprise a polymeric shell having the teeth-receiving cavity formed therein," "[e]ach individual appliance will be configured so that its tooth-receiving cavity has a geometry corresponding to an intermediate or end tooth arrangement," the appliance "is sufficiently resilient to accommodate or conform to the misaligned teeth, and will apply sufficient resilient force … to reposition the teeth," the system includes "a plurality of digital data sets representing a plurality of successive tooth arrangements," and each appliance moves teeth "<2 mm, preferably less than 1 mm, and more preferably less than 0.5 mm."

Every structural element of '469 claim 1's second step is disclosed in the '893 patent. The '893 PCT counterpart, WO 98/58596, published 1998-12-30, i.e., before the '469's earliest date and before its 1999-05-13 filing.

3. The invention as a whole, and the claim 1 / claim 2 architecture

Claim 1 requires only:

(a) determining an occlusion from a computer model of a patient's teeth, and
(b) generating a plurality of appliances based on the occlusion, the appliances being polymeric shells whose "cavities of successive shells have different geometries shaped to receive and resiliently reposition the teeth from one arrangement to a successive arrangement."

Claim 1 does not recite the "keys" at all; "keys" enter only at claim 2, from which claims 3–58 all descend. This bifurcation is the decisive structural fact for the analysis: claim 1 is a broad two-step method whose two steps map onto two well-developed, independent lines of prior art, while claims 2–34 map onto a 1972 publication (Andrews) that the '469 specification itself cites and incorporates.

4. Obviousness grounds

Ground 1 — Claim 1: Kesling + Cottingham/Chiappone + Biggerstaff + Hull ('330) / Chishti ('893)

Motivation to combine (KSR rationales (A), (C), (D), (F)):

1. Same field, same problem, same solution class. Kesling '432 already taught the orthodontic goal the '469 claims serve — "the position of the tooth is so altered by the operator as to assume the ideal position for that particular tooth in that particular assembly" (quoted in Align's own IPR exhibits from Ex. 1005). Cottingham/Chiappone converted that setup into clear plastic shells. Chishti '893 converted the setup into a sequence of such shells generated from digital data sets. A POSITA seeking to move teeth in small increments without braces had every reason to combine them.
2. Known technique applied to a known structure ready for improvement. Biggerstaff had already computerized the setup; the natural next step (explicitly urged in the 1990 DigiGraph literature and in Alcaniz) was to compute the occlusal end-point rather than eyeball it. KSR, 550 U.S. at 417 ("if a technique has been used to improve one device, and a person of ordinary skill … would recognize that it would improve similar devices in the same way, using the technique is obvious").
3. Removing operator subjectivity was the acknowledged driver. The '469 specification itself frames the problem: "the final tooth arrangement is determined by the treating orthodontist who writes a prescription … without a precise calculation of forces being exerted on the teeth when they contact each other." That statement of the problem is a motivation to automate the occlusion determination, not evidence of non-obviousness.
4. Predictable result. Each element performs its own known function; the combination produces nothing more than the expected ability to plan and deliver an aligner series without the clinician iterating manually. No new and unexpected property is asserted for the combination per se.

Ground 2 — Claim 1 (§ 102-adjacent, and § 103 over '893 + Kesling): the Align ancestor

If the WO 98/58596 publication of the '893 application (1998-12-30) is available as a § 102(a) printed publication, claim 1 is squarely met by '893 alone for the appliance-generation element, with Kesling '432 / Cottingham / Chiappone supplying the positioner ancestry and Biggerstaff supplying the computer-model occlusion step. Even if '893 is treated as § 102(e) art only, the combination with the 1972/1969/1949 references supplies the motivation.

Important caveat — common ownership. Both '893 and the '469 are Align/Chishti-family documents. Because the '469 was filed on or after 1999-11-29, pre-AIA 35 U.S.C. § 103(c) (as amended) can disqualify, for obviousness purposes, subject matter that qualifies as prior art only under § 102(e), (f) or (g) when commonly owned at the time the invention was made. Two consequences:

• The § 102(e)-only benefit of the '893 patent (issued 1999-11-02, i.e., after the '469 priority date) is the vulnerable route.
• The § 102(a)/(b) printed-publication route (WO 98/58596, 1998-12-30) is not disqualified by § 103(c), because § 103(c) does not reach § 102(a)/(b) art. This is the analytically robust path and it is why the '893 PCT publication matters more than the '893 U.S. patent.

A petitioner should therefore lead with the third-party art (Kesling, Cottingham, Chiappone, Biggerstaff, Alcaniz, Hull, Duret, Andreiko) and use '893 only as corroboration, precisely to avoid the § 103(c) safe harbour.

Ground 3 — Claims 2–34 (the Six Keys): Andrews 1972 + Andrews '900 + Biggerstaff '72, applied to the Ground 1 base

This is the strongest ground in the case, for a reason that is unusual: the '469 specification expressly identifies the source of every one of these limitations. The specification states the process "optimizes the occlusion based on six characteristics (Six Keys) that were found to be consistently present in a collection of 120 casts of naturally optimal occlusion," names them ("a molar relationship key, a crown angulation key, a crown inclination key, teeth rotation key, teeth contact point key, and an occlusal plane key"), and then says: "These keys are described in Lawrence F. Andrews, 'The six keys to normal occlusion,' Am. J. Orthod. Vol. 62, No. 3 pp.296-309 (9/72) and in Chapter 3 of his book entitled Straight Wire—The Concept and Appliance … the contents of which are incorporated by reference."

An applicant's incorporation of a 1972 journal article is an admission of its availability; that article is § 102(b) art on its face, and its teachings read onto the dependent claims element-by-element:

Motivation. Andrews expressly framed the Six Keys as "referents … basic standards against which deviations could be recognized and measured" and as deterministic, quantifiable treatment objectives: the whole point of the article was that "if one knew what constituted 'right,' he could then directly, consistently, and methodically identify and quantify what was wrong." A POSITA automating the final setup on a computer (Biggerstaff/Alcaniz) would have been directed to the Six Keys as the ready-made, landmark-based objective function — and the '469 specification confirms that this is exactly what its own inventors did. Further, the FACC and tip/torque values of claims 13 and 17–21 were already embodied as physical geometry of the Andrews '900 pre-adjusted bracket; encoding a known bracket prescription as a digital target is a mere substitution of one known form of the same information for another (KSR rationale (B); In re Gulack, 703 F.2d 1381 (Fed. Cir. 1983) on information-bearing limitations).

Anticipated counter-argument: Align would argue the references are "non-analogous" because bracket prescriptions are not CAD. That fails: the art is the same field of endeavour (orthodontic treatment planning and appliance design) and is reasonably pertinent to the problem the '469 addresses (defining the final position of teeth). In re Bigio, 381 F.3d 1320 (Fed. Cir. 2004).

Ground 4 — Claims 35–41 and 52–58 (optimization, feature identification, ideal/abstract models, archforms)

The "abstract model of idealized teeth placement specified by one or more arch forms" (claims 53–55, 58) is met by the archform/setup practice that pervades the orthodontic art — Kesling's wax setup on a standard base, and the arch-form-driven computerized setups of Biggerstaff and Andreiko.

Ground 5 — Claims 42–48 (progress reports browsable over WAN/Internet/LAN; viewed by patient or clinician)

This is the weakest ground on the present record and should be flagged as such. None of the references retrieved from the '469 family's own citation lists is a networking/telemedicine reference; the disclosures in the family NPL lists are orthodontic and CAD/CAM references. Obviousness would have to be established by combining the orthodontic base with general-purpose networked client–server reporting art then in existence (telemedicine, web-based clinical records, e-commerce order/status systems), on the theory that:

• placing a known report on a known network is a predictable variation using an art-recognized technique (KSR; In re Kollar; and the Federal Circuit's repeated treatment of computer/Internet implementation of known functions as an obvious design choice); and
• the specification itself gives no technical detail beyond conventional web browsing, which supports treating the limitation as a non-technical, result-oriented feature.

Caveat: absent a specific networking reference in the record, claims 42–48 are materially more defensible than 1–41, and a challenger relying only on the '469's own cited-art list would struggle here. (Align has separately been litigated on network/remote-treatment patents — e.g., the Dental Monitoring v. Align appeals noted in the prior section — but those involve different patents and are not prior art to the '469.)

Ground 6 — Claims 49–51 (user is a patient or a clinician; user manipulates the computer representation)

Obvious over Biggerstaff/Alcaniz/DigiGraph interactive systems in view of Kesling/Cottingham (the treating professional performs the setup) and the '469's own admitted art. That the alternative "user" is the patient is a bare recitation of an actor with no different function; the claim is a mental/administrative designation with no structural or process consequence. In re Schreiber, 128 F.3d 1473 (Fed. Cir. 1997) (reciting a result without the means to achieve it adds nothing).

5. Differences and a suggested primary/back-up ground chart

Teaching away / criticality. I found no reference in the record that teaches away from determining the final arrangement by computer or from delivering it via successive clear shells. The nearest "teach away" argument — that orthodontists distrusted non-specialist-generated setups and that removable elastomeric appliances were regarded in 1999 as finishing appliances only after braces (an argument Align's expert advanced in ClearCorrect v. Align, IPR2016-00270, describing the pre-Invisalign art as "an entirely reactive process") — is a secondary-consideration argument about the industry, not a disclosure that dissuades the combination. It also cuts both ways: Align's own IPR record shows the Board instituted a § 103(a) ground over Snow + Hultgren + Kesling against a sibling Chishti patent (US 6,699,037), demonstrating that a POSITA would have combined a digitized-scan reference, a bite-registration/scan reference, and the Kesling positioner. (I was unable to verify the final written decision in IPR2016-00270 within this session — do not treat that citation as a validity holding; only the instituting ground is confirmed by the retrieved exhibit.)

6. Objective indicia (Graham factor 4) — where Align's best arguments lie

These are the arguments for non-obviousness that must be rebutted (nexus required, Ormco Corp. v. Align Tech., Inc., 463 F.3d 1299 (Fed. Cir. 2006)):

1. Commercial success / industry adoption of the Invisalign system (millions of cases), with nexus to claim 1's aligner-series method.
2. Long-felt but unmet need: a century of brackets and removable positioners that, by Align's own IPR expert testimony, were "reactive" and used for "minor additional movements after treatment with braces."
3. Skepticism / teaching away: the then-prevailing view that digitally planned therapy dispensed with clinician judgment; the '469 specification's own framing of the uncertainty in prescribing final tooth positions.
4. Unexpected results: predictable simulation-to-mouth correlation across a 20+ aligner series.
5. Copying/industry praise: the OrthoClear design copied Align's aligners, and OrthoClear took an IP assignment/settlement (2006-10-12) — arguably evidence of copying, though also evidence of a crowded art.

Counter-points: the strongest of these (commercial success, long-felt need) are rebuttable by establishing that the solution was in the POSITA's toolkit and merely awaited the recognized incentive to deploy it — KSR's "design incentives and other market forces" and "obvious to try" rationales (In re O'Farrell limits noted). The '469's own terminal disclaimer further erodes its ability to claim distinctness from the family's earlier disclosures.

7. Contradictions / record problems to flag

1. Date inconsistency in the prompts. The operating instructions give today = 2026-09-29, while this task states Current Date: April 26, 2026. The previously generated litigation section cites Federal Circuit decisions "decided 2026-07-07," "2026-08-10," and "2026-07-21," and a PTAB hearing "set for September 1, 2026" — all of which postdate 2026-04-26. Either the task date is wrong or the litigation section is extrapolated. I flag this rather than silently reconciling it. (This does not affect the § 103 analysis, which is keyed to the 1998/1999 priority dates.)
2. No backward-citation section was supplied. The page text given to me terminates within the forward "Cited By" list; the backward "(56) References Cited" record had to be reconstructed from same-family front pages. The retrieved snippets were themselves truncated (e.g., US 8,651,859's list breaks at "4,850,864 … 4,850,865 A 7/1…"), so the list in § 2.1 may be incomplete at the tail.
3. Priority date discrepancy (1998-11-30 vs. 1999-05-13) carried over from the prior section. This is outcome-determinative for at least one reference (WO 98/58596, published 1998-12-30 — § 102(a) if the critical date is 1999-05-13; still available, but the analysis shifts if the invention date is 1998-11-30 and it must be shown the WO's content predates).
4. § 103(c) common-ownership trap for the Align/Accept ancestor documents — quantified in Ground 2. Any obviousness theory built only on the '893 patent as § 102(e) art is attackable; the WO publication route is not.
5. Unverified items (explicitly not asserted as fact): the ITC § 337-TA-562 validity findings on the '469 claims; the final outcome of IPR2016-00270; the Nahoum 1964 NPL entry on the '469 front page; the exact PAR-index citation. I could not verify these within the session.
6. Claim 25 reads "wherein the contact point is tight C." — a stray character in the printed claim. I have quoted the claim literally and have not auto-corrected it; it is an indefiniteness artifact, relevant to § 112, not to § 103.

8. Bottom line

On the record of the '469 patent's own cited art, claims 1–34 are strongly vulnerable under § 103(a), and claims 35–41 and 52–58 are vulnerable, on combinations of (i) Kesling-family positioner/clear-shell art with (ii) Biggerstaff's and Alcaniz's computerized occlusal setup and analysis, and (iii) Andrews' Six Keys — which the '469 specification quotes and incorporates by reference, making the dependent-claim limitations an almost verbatim restatement of a 1972 printed publication. The single strongest fact in the challenger's favour is the applicant's own terminal disclaimer, which concedes no patentable distinction over the earlier family disclosure. Claims 42–48 (networked progress reports) are the least clearly obvious on the cited record and would require additional networking/telemedicine art not present in the '469's citation lists.