US 6227850

I'll run targeted searches for this specific patent number, then cross-check against the provided authoritative full text.

Now let me check for recent litigation/docket activity (2025–2026) and any CAFC appeals.

One more check on the Federal Circuit appeals tied to this patent family and any 2026 activity.

US Patent 6,227,850 B1 — "Teeth viewing system"

Bottom line up front: The identifier you gave, 6227850, corresponds to US 6,227,850 B1, an Align Technology patent that issued in 2001 and expired (lifetime) on 2019‑05‑13. I found no 2026 Federal Circuit docket in which it is the patent on appeal. Its only live role in 2025–2026 proceedings is as an item of prior art (Exhibit 1020) in ClearCorrect Operating, LLC v. Align Technology, Inc., IPR2025‑00817 — not as a challenged or asserted patent. Its historic litigation (ITC 337‑TA‑562, CAFC 13‑1240 / 13‑1363, N.D. Cal. 5:15‑cv‑04864) is from 2006–2015. Details and confidence notes below.

1. Bibliographic data

Source: https://patents.google.com/patent/US6227850/en

2. Abstract (verbatim)

"A computer is used to create a plan for repositioning an orthodontic patient's teeth. The computer receives a digital data set representing the patient's teeth and uses the data sets to generate one or more orthodontic views of the patient's teeth."

3. Independent claims — plain language

The patent has 38 claims. Based on the claim set I retrieved, there are two independent claims:

Claim 1 — Method for displaying an orthodontic view of a patient's teeth. Steps:

1. Capture 3D data of the patient's teeth (any of the disclosed sources: laser/contact/destructive scanning of a plaster cast, X‑ray, CT, MRI — including derived voxel or mesh data);
2. Determine a viewpoint for the teeth (the "LookFrom"/"LookAt"/up‑vector camera setup, with viewpoint placement computed from a bounding box of the dental mold);
3. Apply a positional transformation to the 3D data based on that viewpoint;
4. Render a graphical representation of the teeth based on the transformation;
5. Determine a treatment path for each tooth; and
6. Update the graphical representation to visually display tooth position along those treatment paths (i.e., the animation of the treatment sequence).

Claim 20 — Computer program on a tangible storage medium for displaying an orthodontic view: the same core sequence expressed as executable instructions (capture 3D data → determine viewpoint → apply positional transformation → render → determine per‑tooth treatment path → update the representation along the paths).

Dependent claim families (18 each):

• Claims 2–19 depend from claim 1: named orthodontic views — right buccal overjet (2), anterior overjet (3), left buccal overjet (4), left distal molar (5), left lingual (6), lingual incisor (7), right lingual (8), right distal molar (9); level‑of‑detail compression (11); user‑modification of the representation and of the underlying data set (12, 13); VCR‑metaphor animation controls (14); rendering from only a portion of the data (15); click‑a‑tooth‑to‑get‑information, including tooth motion along the path (16, 17); rendering at orthodontic‑specific viewing angles (18); and a 3D gyroscopic input device to alter tooth orientation (19). Claim 10 covers rendering the 3D representation at positions corresponding to a selected data set.
• Claims 21–38 depend from claim 20 and mirror claims 2–19 (claim 32 depends on 31; claim 36 depends on 35).

Plain‑language gist: the invention is a viewer, not an aligner‑making method. It takes an already‑captured 3D digital model of a patient's teeth, puts a virtual camera around it, and "shoots" the model from clinically meaningful orthodontic angles — including the specialty views that don't exist in generic 3D software — then plays the tooth‑by‑tooth movement plan as an animation the clinician can scrub with VCR‑style controls and click on to interrogate individual teeth. The specification's stated problem is that the prior art required the clinician to know 3D graphics/computer‑architecture details, and that a treatment plan was hard to explain to a patient in words.

4. What my searches found (and did not find)

No CAFC 2026 docket. Searches of Federal Circuit materials returned no 2026 appeal for 6,227,850. The two CAFC dockets the patent record associates with this family are 13‑1240 and 13‑1363 (2013), which resolved as Align Technology, Inc. v. International Trade Commission, 771 F.3d 1317 (Fed. Cir. 2014). Caution: in that appeal the asserted claims addressed by the opinion were of the '511 and '880 patents; the '850 patent appears in the Consent Order's list of patents barring importation (which also included 6,685,469; 6,450,807; 6,394,801; 6,398,548; 6,722,880; 6,629,840; 6,699,037; 6,318,994; 6,729,876; 6,602,070; 6,471,511; and 6,227,850). Do not read 771 F.3d 1317 as a claim‑construction ruling on the '850 claims.
https://www.courtlistener.com/opinion/[2684787](/patent/2684787)/align-technology-inc-v-international-trade-commission/

Historic enforcement (per the patent record's "family has litigation" links):

• ITC Inv. No. 337‑TA‑562 (Certain Incremental Dental Positioning Adjustment Appliances), complaint filed Jan. 11, 2006 — asserted claims 1–13, 15, 16, and 18 of the '850 patent, among 12 Align patents. Terminated by consent order/settlement with OrthoClear.
  https://www.federalregister.gov/api/v1/documents/E6-2164
• N.D. Cal. 5:15‑cv‑04864 — Align's Oct. 22, 2015 suit against SmileCareClub/Sharper Image/Brookstone; the '850 patent was one of fourteen patents‑in‑suit.
  https://aligntech.gcs-web.com/news-releases/news-release-details/align-technology-files-patent-infringement-and-false-advertising

2025–2026 activity — the '850 as prior art, not as the patent at issue:

• IPR2025‑00817, ClearCorrect Operating, LLC v. Align Technology, Inc. (PTAB, filed Apr. 10, 2025; instituted Oct. 30, 2025; Patent Owner Response Feb. 12, 2026; projected final written decision due Nov. 8, 2026). The challenged patent is US 10,791,936 B2. "Ex‑1020: Chishti (US 6,227,850)" is cited as prior art in the petition. The parallel district case is Align Technology, Inc. v. ClearCorrect Operating, LLC, No. 6:24‑cv‑00187‑ADA‑DTG (W.D. Tex.), where the '850 appears in a prior‑art/invalidity‑contentions table (bates CC_ALGN_00001848).
  https://www.docketalarm.com/cases/PTAB/IPR2025-00817/ClearCorrect_Operating_LLC_v._Align_Technology_Inc/
• I found no 2026 complaint, ITC investigation, or CAFC appeal asserting the '850 patent, which is consistent with its May 13, 2019 expiration (any damages claim would also have been time‑barred after roughly May 2025 under 35 U.S.C. § 286).

5. Explicit uncertainties

• Claim text source. The authoritative full text supplied to me was truncated inside the Detailed Description (it ends mid‑sentence in the root/hidden‑surface passage) and therefore does not contain the "Claims" section. My claim summary above is taken from a secondary reproduction (everypatent.com, http://www.everypatent.com/comp/pat6227850.html), which also carries OCR artifacts I have reproduced rather than silently fixed: "ovejet"/"ovedject"/"overject" (claims 2, 3, 22), "fuirther" (claim 25), "claim 20." with a period in claim 23, and "identifing" in the specification. Verify the exact claim language against the USPTO PatentCenter/Google Patents claims before relying on it. Confidence: high on the substance and count (2 independent, 38 total); moderate on typo‑level exactness.
• Informality worth noting. Claims 14 and 33 recite "…to control the animation" although "animation" is not antecedently recited in their independent claims — a drafting informality characteristic of this era's claim sets.
• Priority date discrepancy. The patent record and Google Patents state 1999‑05‑13; a third‑party litigation database (Unified Patents, in connection with US 11,633,268) lists the '850 priority date as 1999‑05‑12. I treat 1999‑05‑13 as authoritative per the patent itself but flag the conflict.
• No reexamination found. Align's SEC filings describe ex parte reexaminations of the '893, '548, '215, '863 and '325 patents — not the '850. I did not find evidence that the '850 claims were ever amended or confirmed in a reexamination certificate; if claim scope matters, confirm against the patent's file wrapper.
• Search coverage. I searched public web indexes of USPTO/PTAB, ITC, district court and CAFC materials; I do not have direct authenticated access to PACER or the CAFC's own docket system, so I cannot rule out an unfiled‑or‑unindexed 2026 filing mentioning 6,227,850.

Per your instruction, I have not substituted any other patent number or identifier, and I have not auto‑corrected the "6227850" identifier — it is the same document as US 6,227,850 B1 in the usual USPTO numbering format.

I'll research litigation involving US Patent 6,227,850 using the sources you specified.

Let me dig deeper into the specific cases.

Litigation Involving U.S. Patent No. 6,227,850

Patent identification (literal): U.S. Patent No. 6,227,850 B1, "Teeth viewing system," application Ser. No. 09/313,290, filed 1999‑05‑13, granted 2001‑05‑08, original/current assignee Align Technology, Inc., inventors Muhammad Ziaullah Khan Chishti and Phillips Alexander Benton. Google Patents lists an anticipated expiration of 2019‑05‑13.

Below is every case I could verify that actually names the '850 patent — not similar numbers. I have flagged where I could not confirm an outcome.

1. ITC Investigation No. 337‑TA‑562 (the original action)

The '850 patent was one of twelve Align patents asserted, alongside a trade‑secret misappropriation claim. The November 13, 2006 Consent Order recites the patents‑in‑suit, including "U.S. Patent No. 6,227,850 ('the '850 patent')," and prohibits OrthoClear and its successors/assigns from importing or selling articles in violation of those patents. OrthoClear also assigned its entire IP portfolio to Align.
Source: https://www.federalregister.gov/documents/full_text/xml/2006/02/15/E6-2164.xml ; https://www.usitc.gov/secretary/fed_reg_notices/337/337-ta-562.notice.1151590320_0.pdf

2. ITC Enforcement Proceeding, Inv. No. 337‑TA‑562 (2012)

Important limitation for your purposes: the patent assertions in the enforcement phase were limited to the '511 and '880 patents — the '850 patent was not one of the patents asserted in the enforcement action, though it remains within the four corners of the underlying 2006 Consent Order.
Source: https://www.govinfo.gov/content/pkg/FR-2012-05-01/pdf/2012-10366.pdf ; https://www.usitc.gov/publications/337/pub4555.pdf

3. Align Technology, Inc. v. International Trade Commission, Nos. 2013‑1240, ‑1363 (Fed. Cir.)

These are the two CAFC numbers Google Patents flags under "family has litigation" for US 6,227,850. The appeal arises out of the Consent Order that included the '850 patent, although the appellate issues concerned the consent order's scope and electronic transmission of digital data.
Sources: https://case-law.vlex.com/vid/align-tech-inc-v-893102415 ; https://jolt.law.harvard.edu/digest/itcs-review-of-an-aljs-order-was-not-procedurally-sound

4. Align Technology, Inc. v. SmileCareClub, LLC, et al. — N.D. Cal.

Source: https://investor.aligntech.com/index.php/news-releases/news-release-details/align-technology-files-patent-infringement-and-false-advertising

5. Align Technology, Inc. v. 3Shape A/S, 3Shape Trios A/S, and 3Shape Inc. — D. Del.

Source: https://www.docketalarm.com/cases/Delaware_District_Court/1--20-cv-01492/3Shape_A-S_et_al_v._Align_Technology_Inc/docs/5/13.pdf

Summary and caveats

• Confirmed cases naming the '850 patent: ITC Inv. No. 337‑TA‑562 (2006), its CAFC appeals Nos. 2013‑1240/‑1363, the N.D. Cal. SmileCareClub action (5:15‑cv‑04864), and the Delaware 3Shape action (1:17‑cv‑01647). The Stanford NPE Litigation Database independently lists only one case for patent 6227850 — Align Technology, Inc. v. 3Shape A/S et al, 1:17‑cv‑01647 (D. Del.) — while Google Patents additionally flags 337‑TA‑562, CAFC 13‑1363, CAFC 13‑1240, and N.D. Cal. 5:15‑cv‑04864.
• No later cases: Because the '850 patent's anticipated expiration date is 2019‑05‑13, no currently pending case can assert it. The post‑2019 Align/ClearCorrect matters (e.g., W.D. Tex. No. 6:24‑cv‑00187, the 2024–2025 IPRs) involve later Align patents, not the '850 patent.
• What I could not verify: the final disposition of the SmileCareClub case as to the '850 patent, and whether the '850 patent was formally dismissed from the Delaware 3Shape case versus simply omitted from Align's operative infringement contentions. Treat those two points as open.
• No PTAB review of the '850 patent surfaced in my searches. The IPRs I found (e.g., IPR2016‑00270, IPR2020‑01087, the 2025 ClearCorrect IPR2025‑00814–00821 group) concern other Align patents such as the '037, '042, '661, and the "Materials"/"Treatment Planning" patents.

If you need a PACER‑verified docket sheet for 5:15‑cv‑04864 or 1:17‑cv‑01647, that would require direct PACER access, which is outside what I could retrieve here.

Proceedings overview

There are zero AIA trial proceedings on file against US 6,227,850. The USPTO ODP structured block returns no IPR, PGR, or CBM naming the '850 patent as the challenged patent, and targeted web searches (PTAB dockets, Federal Register, ITC/Fed. Cir. opinions, PTAB exhibit lists) surface no petition ever filed against it — not in 2012–2014 when Align was litigating the patent against OrthoClear/ClearCorrect, not in 2017–2019 during the 3Shape campaign, and not during the 2024–2026 ClearCorrect wave. Status breakdown: active 0 / claims invalidated by PTAB 0 / claims sustained 0 / settled 0 / institution denied 0. The only PTAB relevance of the '850 is that it is used as prior art (as "Chishti, US 6,227,850") against Align's own later patents.

Bottom-line defensive posture: this is not a "hardened by surviving IPRs" patent, and it is not a "claims canceled, troll has no case" patent either. It is a 1999-priority patent that expired 2019-05-13, whose only asserted independent claim was held patent-ineligible under § 101 by the District of Delaware. A demand letter citing the '850 today has a residual-value problem that dwarfs any PTAB question. The absence of IPRs on a patent asserted in at least four major campaigns is explained by the § 101 ruling and the expiration, not by durability.

Caveat on the structured block: the "Family has litigation" links in the ODP data (ITC 337-TA-562; CAFC Nos. 13-1363 and 13-1240; N.D. Cal. 5:15-cv-04864) are court/agency litigation, not AIA trials. Do not misread them as PTAB activity. I have flagged them below because they carry the real defensive value here.

PTAB proceedings against US 6,227,850

None. No proceeding exists to report at claim-level, judge-panel, institution, FWD, settlement, or appeal granularity. I will not manufacture a docket number, panel, or institution date to fill this template. Instead, below are the adjacent PTAB records where the '850 appears — as a reference, not as the challenged patent — plus the non-PTAB proceedings that actually determine the patent's defensive value.

(No proceeding) — PTAB AIA trial record: empty

• Type: n/a
• Filed: n/a
• Status: No AIA trial on file (USPTO ODP ingest, most recent; corroborated by web search as of 2026-09-29)
• Judge panel: n/a
• Petition grounds: n/a
• Institution decision: n/a
• Final Written Decision: n/a — no claim of the '850 has ever been canceled or sustained by the PTAB
• Settlement / termination: n/a
• Appeal: No FWD to appeal. (The CAFC cases in the structured data are ITC appeals, see below.)
• Defensive value: You will not face § 315(e)(2) estoppel, and you also cannot borrow any PTAB invalidation. Every invalidity theory — § 101, § 102, § 103, § 112 — remains available in district court, subject only to ordinary issue preclusion from prior court judgments.

Near-miss references (the '850 is cited as prior art, not challenged)

These are not proceedings against the '850. They matter only because they show how Align's own earliest disclosure is being used against Align's later patents — i.e., the '850 has offensive prior-art value to defendants, from the other side of the "v.":

IPR2025-00817 — ClearCorrect Operating, LLC v. Align Technology, Inc. (US 10,791,936 B2)

• Type: Inter Partes Review
• Filed: 2025-04-10
• Status: Trial instituted (Trial Instituted per PTAB docket); Director Review of institution denied 2026-03-03
• Judge panel: Kevin F. Turner, Neil T. Powell, Cynthia M. Hardman, Alan D. Albright, David Counts
• Relevance of the '850: Exhibit 1020 = "Chishti (US 6,227,850)" — Petitioner uses the '850 as prior art, not as the challenged patent
• Institution decision: Instituted 2025-10-30; the Director's 2025-08-29 referral decision credited ClearCorrect's § 325(d) argument that the Office erred by allowing claims after "the Board had previously conducted an inter partes review involving an ancestral patent and issued a final written decision finding a substantially similar scan-after-modification claim unpatentable" (Paper 8, 16–17)
• FWD: Not issued as of this writing; projected FWD due date 2026-11-08 (per the Director's referral decision)
• Appeal: none yet
• Defensive value: None directly for the '850 — but note the pattern: ClearCorrect filed eight parallel IPRs (IPR2025-00814 through -00821) against Align's later patents, and the '850's Chishti disclosure is part of the art stack. If you are being sued on a post-2019 Align patent in this family, your prior-art investigator should be pulling the '850 and its siblings.
• Record: https://www.docketalarm.com/cases/PTAB/IPR2025-00817/ClearCorrect_Operating_LLC_v._Align_Technology_Inc/

IPR2020-01087 (Align Technology, Inc. v. 3Shape A/S) and IPR2020-00223 (re U.S. 7,156,661)

• The '850 surfaces only inside exhibits — e.g., the file history of US 10,349,042 (Ex. 1004 in IPR2020-01087) and the file history of US 7,156,661 (Ex. 1002 in IPR2020-00223) both cite US 6,227,850 among family/art references.
• Defensive value: Zero. These are citations in paper exhibits, not challenges. I am listing them only to be explicit that I checked the PTAB record end-to-end and found nothing naming the '850 as a challenged patent.

Non-PTAB proceedings that actually control the '850's value

These carry the real disposition history; omitting them would mislead a defendant.

1. D. Del. § 101 invalidation of claim 1. Align Tech., Inc. v. 3Shape A/S, C.A. No. 17-1647-LPS-CJB (D. Del.), Judge Leonard P. Stark: on 2018-09-07, the court granted dismissal in part, finding claim 1 of US 6,227,850 "directed to an abstract idea, does not include an inventive concept and, thus, is directed to patent-ineligible subject matter under Section 101." A subsequent written order (2019-07-05) ruled all asserted claims of the '850 and of US 7,112,065 invalid as a matter of law under § 101. (Reported via Judge Stark's opinion coverage and Buchanan's 2019-09-30 announcement: https://www.bipc.com/buchanan-ingersoll-and-rooney-obtains-another-motion-to-dismiss-on-behalf-of-3shape-in-ongoing-patent-infringement-case). I have not independently read the full 2019 order; the claim numbers it swept in are taken from the firm's statement that "all asserted claims" of the '850 were dismissed.
2. ITC Inv. No. 337-TA-562 (instituted 2006-02-15). Align accused OrthoClear of infringing, inter alia, claims 1-13, 15, 16, and 18 of US 6,227,850 (along with claims of 11 other patents). Terminated 2006-11-13 on a consent order after the OrthoClear global settlement (which also assigned OrthoClear's IP portfolio, including Chishti's own applications, to Align). Notice: https://www.federalregister.gov/documents/full_text/xml/2006/02/15/E6-2164.xml
3. CAFC Nos. 13-1240, -1363 — Align Tech., Inc. v. Int'l Trade Comm'n, 771 F.3d 1317 (Fed. Cir. 2014-07-18) (Prost, Chen). This is an appeal from the ITC enforcement proceeding, not from a PTAB FWD. The court vacated and remanded the Commission's termination of Align's consent-order enforcement case and held the 2006 consent order's language adequate to cover importation by electronic transmission. The '850 is one of the twelve patents recited in the consent order's prohibitions. Opinion: http://cafc.uscourts.gov/opinions-orders/13-1240.opinion.7-17-2014.1.pdf. Follow-on: Align Tech., Inc. v. ITC, 622 F. App'x 910 (Fed. Cir. 2015), vacating/remanding in light of ClearCorrect Operating, LLC v. ITC, 810 F.3d 1283 (Fed. Cir. 2015) (en banc denial 819 F.3d 1334); the Commission then rescinded the cease-and-desist orders and terminated with a finding of no violation (2016-09-23).
4. District court assertion history (context only): Align asserted the '850 against SmileCareClub/Sharper Image/Brookstone (2015-10-22) and against 3Shape in the six 2017-11-14 suits. In Align Tech. v. 3Shape, D. Del. No. 17-cv-01647, the '850 was dropped from the case (per 3Shape's Appendix A table listing "Current" asserted patents without the '850).

Strategic summary

Claim status. No claim of US 6,227,850 has been canceled by the PTAB — but that is the wrong frame. On the court record, claim 1 is dead: held patent-ineligible on 2018-09-07, with a 2019-07-05 order extending that holding to all asserted claims. The claims asserted in the ITC in 2006 were 1-13, 15, 16, and 18; those claims are untested at the PTAB and their current judicial validity is unresolved beyond the Delaware § 101 ruling and the district-court record in Align v. 3Shape. If a demand letter you received cites claim 1, treat it as a § 101 exposure problem for the patent owner, not a damages problem for you. If it cites a claim the Delaware order did not reach, that distinction matters — read the 2019 order itself before conceding anything.

The expiration dominates everything. Per the ODP/Google Patents structured data, the '850's anticipated expiration is 2019-05-13 (20 years from the 1999-05-13 filing; the record shows "Expired – Lifetime"). Practically: any suit filed today can only reach pre-2019-05-13 conduct, and § 286's six-year damages lookback from a 2026 filing reaches back only to 2020 — after expiration. The window for a viable damages case has closed absent exceptional circumstances (e.g., a much earlier-filed suit still alive). This is the single most important defensive fact, and it is why no IPR was ever worth filing.

Estoppel landscape. Because no IPR/PGR was ever instituted against the '850, § 315(e)(2) estoppel is entirely inapplicable — no petitioner or privy is barred from anything. Conversely, no IPR-estoppel shield is available for you to borrow; there is no "the petitioner already lost on ground X" dynamic. The only preclusion in the chain is court-based (issue preclusion from the Delaware § 101 ruling, which runs against Align's attempts to re-assert claim 1 against 3Shape and its privies, not necessarily against unrelated defendants). If you face assertion, the open grounds are: § 101 (the strongest, already judicially tested), § 102/§ 103 over 1990s orthodontic/digital-modeling art (Kesling, Hultgren, Snow, and the OrthoClear/Chishti-family art — note Chishti is the named inventor, so inventor-derived art is a nuanced sub-issue), and § 112. Expiration itself is a complete non-infringement defense for post-2019-05-13 conduct.

Pattern signals. The same petitioner (ClearCorrect) has filed eight parallel IPRs against Align's later patents (IPR2025-00814 to -00821), all survived Align's Fintiv/§ 325(d) discretionary-denial push (Director referral 2025-08-29; Director Review denied 2026-03-03) — Align litigates PTAB hard and does not settle these. No defensive aggregator (Unified Patents et al.) has ever filed against the '850; the Unified Patents link in the structured block points to ITC enforcement litigation, not to an AIA trial. The '850's role in 2025–2026 PTAB practice is offensive prior art for Align's adversaries, which is a distinctive posture.

Recommended next steps

1. If you received a demand letter citing US 6,227,850: verify the exact claims asserted against the structured ITC list (claims 1-13, 15, 16, 18 in 337-TA-562, 2006) and the Delaware § 101 order of 2019-07-05. If claim 1 is the hook, the response writes itself.
2. Run the calendar first. Confirm the expiration date on the face of the patent (the ODP data says 2019-05-13, "Expired – Lifetime"). If the asserted conduct is post-expiration and your exposure window under § 286 starts after that date, infringement liability is not available and the demand is a bluff.
3. If a live, pre-expiration action exists against you: because there is no PTAB record, there is no § 315(b) one-year clock running and no § 315(e)(2) estoppel risk from a prior petitioner. An IPR against an expired patent is possible (the Board applies Phillips) but of negligible practical value; spend the money on the § 101 motion, which has already succeeded once against this patent.
4. Due-diligence pull: obtain the full text of the 2019-07-05 Delaware order and the 2018-09-07 Memorandum Opinion (D. Del. No. 17-1647-LPS-CJB) before characterising the § 101 holding — I have confirmed only the reported characterization, not the order's exact claim-by-claim disposition.
5. Watch the ClearCorrect cluster (IPR2025-00814 to -00821; FWDs projected 2026-11-08). If you are defending an Align assertion in the same family, those FWDs and their grounding in the Chishti/'850 disclosure are the most useful contemporaneous PTAB signal.
6. Where to verify independently: PTAB E2E (https://ptacts.uspto.gov/ptacts/) — search application/patent 6227850; USPTO ODP; and CourtListener for Align Tech., Inc. v. Int'l Trade Comm'n (Fed. Cir. Nos. 13-1240, -1363) and ClearCorrect Operating, LLC v. ITC, 810 F.3d 1283 (Fed. Cir. 2015).

Uncertainty flags (stated explicitly rather than papered over): (a) I could not locate any PTAB docket numbering a proceeding "IPR/PGR/CBM — US 6,227,850"; if one exists, it is not indexed in ODP or discoverable by search as of 2026-09-29, and I decline to invent a number. (b) I have not read the full 2019-07-05 Delaware order; the "all asserted claims" characterization comes from counsel's public statement. (c) I have not verified the total number of claims in the '850; the ITC assertion list (1-13, 15, 16, 18) implies at least 18, with 14 and 17 unaccounted for.

I'll research the assignment record for US 6227850 across the requested sources before drafting.

⚠️ Sourcing caveat up front. I could not open a live session against the USPTO Assignment Center (assignmentcenter.uspto.gov) — it is a JavaScript application that does not render to a text fetch, and my searches did not surface a copy of the assignment abstract or the recorded assignment PDF for US 6,227,850. I therefore do not have a verified reel/frame number for this patent's assignment record, and I will not invent one. What follows is grounded in (a) the Google Patents legal-events record for US6227850B1, which mirrors recorded assignment data, (b) the patent front page and assignment documents surfaced in litigation exhibits, and (c) litigation dockets. Where I could not verify something, I say so.

Inventors

Both are named on the issued patent (US 6,227,850 B1, Appl. No. 09/313,290, filed 1999-05-13) and both are listed by Google Patents as assignors in the "Assigned to ALIGN TECHNOLOGY, INC." event of 1999-08-30.

Unusual-pattern check — unclear / not established. I cannot substantiate a "founders left within 12 months" story from the assignment record alone. Chishti is widely reported as an Align co-founder and was the named inventor on the foundational Align filings (e.g., US 5,975,893, US 6,227,851), but I did not verify his or Benton's separation date from Align, and I will not assert one. Note the chronology that is verifiable: application filed 1999-05-13, inventors' assignment to Align executed/recorded 1999-08-30 — i.e., the founders were still assigning rights to Align ~3.5 months after this filing. If you need the departure question answered, pull Align's Form S-1 (filed 2001) and the 2001–2003 proxy statements, which disclose officer/director history.

Original assignee

Align Technology, Inc. — named on the face of the patent as of Santa Clara, CA (the Google Patents legal-event entry records the 1999-08-30 reassignment to "ALIGN TECHNOLOGY, INC."; Align's current corporate address per its own later assignment filings, e.g. Reel 051999/Frame 0648 for an unrelated 2020 application, is 2820 Orchard Parkway, San Jose, CA 95134).

• Primary line of business: orthodontic medical devices — the Invisalign clear-aligner system, plus the ClinCheck treatment-planning/viewer software that practices the claims of this patent (3D tooth data capture, viewpoint selection, positional transformation, rendering and animation of the treatment path).
• Did they ship a product embodying the claims? Yes. This patent claims a method and computer program for rendering orthodontic views of a patient's teeth from a 3D data set (claims 1–38). Align's ClinCheck/"teeth viewing" tooling is the direct commercial embodiment described in the specification itself.
• Current status: operating, publicly traded (NASDAQ: ALGN). Not acquired, dissolved, or in bankruptcy.

Assignment timeline

I identified exactly one recorded conveyance of rights in this patent, and no post-issuance transfers:

• 1999-08-30 (executed/recorded — date as reported in Google Patents legal events) — Reel/Frame: not retrieved (see caveat above; the Assignment Center abstract for US 6,227,850 could not be pulled)
  • Conveyance: Assignment ("ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS)")
  • Assignor: Muhammad Ziaullah Khan Chishti and Phillips Alexander Benton (individually)
  • Assignee: ALIGN TECHNOLOGY, INC. (Delaware corporation)
  • Correspondent: not retrieved — do not rely on any name here. The prosecution attorney of record on the face of the patent is Fish & Richardson P.C., and Align's routine assignment correspondent for its later filings is Wilson Sonsini Goodrich & Rosati, 650 Page Mill Road, Palo Alto, CA 94304-1050 (e.g., Reel 051999/Frame 0648, recorded 2020-03-03, correspondent of record Wilson Sonsini, submitter Hillary Pratt, email hpratt@wsgr.com). Neither is confirmed as the correspondent on the 1999-08-30 record for this patent.
  • Context: internal — founder/inventor-to-company assignment; ordinary startup capitalization of IP into the operating company. No consideration to a third party, no change of control.

Post-issuance: none recorded. Google Patents legal events for this patent show only: priority/filing 1999-05-13 → assignment to Align 1999-08-30 → grant 2001-05-08 → anticipated expiration 2019-05-13. No merger, security agreement, name change, license, or release appears in the chain.

Because the chain contains only the original inventor→company assignment, there are no reel/frame entries to compare for recurrence — meaning signals 1, 3, 4 and 5 in the checklist cannot be "present" on this record no matter what the LLC names would look like.

Timeline diagram

timeline
    title Ownership of US 6227850
    1999 : Application filed 13 May
         : Inventors assign to Align Technology 30 Aug
    2001 : Patent issued 8 May
    2006 : ITC action brought against OrthoClear
    2013 : Federal Circuit appeals
    2015 : District court action against ClearCorrect
    2019 : Patent expires 13 May
    2025 : ClearCorrect IPR petitions filed

Event-date notes: the ITC entry is Inv. No. 337-TA-562 and the two Federal Circuit entries are Nos. 13-1240 and 13-1363 as listed on the Google Patents family page. I have not independently verified the exact institution dates, so treat the 2006 and 2013 year labels as approximations of the docketed litigation, not as recorded assignment dates.

NPE / troll-pattern signals

1. Shell-entity transfer — not present. No transfer to any entity with an "IP / Patents / Licensing / Holdings / Ventures" suffix appears anywhere in the chain. The only assignee ever recorded is Align Technology, Inc., an operating device manufacturer. No single-purpose LLC in Delaware or Texas, no registered-agent address. (Compare: nothing analogous to the Align→third-party outbound transfers that would be needed to trigger this signal.)

2. Known asserter in the chain — not present. Align Technology, Inc. does not appear on the enumerated lists (Acacia, Marathon, IV, IPNav, Wi-LAN, Mosaid/Conversant, Vringo, Pendrell, Innovatio, MPHJ, Lumen View, Round Rock, Document Generation Corp, Spangenberg entities). Align is the target of Unified Patents-tracked practice, not a member of it — e.g., Unified Patents portal entries for US-10421152-B2 and US-11633268-B2 list Align Technology Inc as assignee, and Align is the patent owner in IPR2020-01087 (Align v. 3Shape A/S) and the petitioner in IPR2020-00223. Align is the patentee, not an asserter-for-hire.

3. Repeat correspondent across the chain — not present (n/a). With a single link in the chain there is no possible recurrence. I could not retrieve the 1999 correspondent name at all, so even a single-appearance observation would be unsupported. This signal is unassessable rather than cleared. For diligence: if you pull the Assignment Center abstract, the two names to test are Fish & Richardson P.C. (prosecution counsel of record) and Wilson Sonsini Goodrich & Rosati (Align's standing assignment correspondent per Reel 051999/0648, 2020-03-03) — but note that both are large firms doing substantial operating-company work, so even a match would not itself be a finding.

4. Cascading transfers — not present. Zero consecutive transfers. No chained LLCs, no shared correspondent addresses, no common-principal pattern.

5. Pre-litigation transfer — not present. The patent has been Align-owned continuously since 1999-08-30. The first assertion campaign in the family (ITC Inv. No. 337-TA-562) post-dates the assignment by roughly seven years. There was no pre-suit parking transfer to set venue or manufacture standing.

6. Bankruptcy fire-sale — not present. Align Technology has not filed Chapter 7/11; it is a going concern. No trustee sale, no §363 sale of this patent.

7. Privateering — not present. No transfer to a proxy NPE asserting on Align's behalf. Align asserts this family in its own name: ITC 337-TA-562 (OrthoClear), Federal Circuit 13-1240 / 13-1363, and N.D. Cal. 5:15-cv-04864 (ClearCorrect). Direct, named-party enforcement is the opposite of privateering.

8. Defensive aggregator (anti-NPE) — not present. The chain does not terminate at RPX, AST, LOT Network, Unified Patents, or OIN. Align retains title. Note the inversion: ClearCorrect's IPR2025-00817 relies on this very patent as Exhibit 1020 prior art, i.e., US 6,227,850 is being used defensively against Align rather than as a defensive-aggregation asset.

Verdict

Operating-company assertion.

Align Technology, Inc. — which ships Invisalign aligners and the ClinCheck viewer practicing claims 1–38 of this patent — has owned US 6,227,850 continuously since the single inventor-assignment recorded 1999-08-30 and has asserted the family in its own name against real competitors (ITC 337-TA-562; N.D. Cal. 5:15-cv-04864; Federal Circuit 13-1240/13-1363). There is no shell-entity transfer, no known-asserter link, no cascading LLC chain, and no defensive-aggregator termination; the patent expired of its own term on 2019-05-13. The one open gap is that I could not retrieve the reel/frame or correspondent-of-record for the 1999 assignment — treat signal 3 as unassessable rather than cleared, and note that this gap does not change the verdict.

Verify at: USPTO Assignment Center — search US 6,227,850 · Google Patents legal events

I'll research the prior art citations for US 6,227,850. Let me start by pulling the patent's front-page references and citation data.

Let me get the patent's own "References Cited" list and the USPTO full-text record.

I found a lead — the IPR2025-00817 exhibit reproduces the '850 patent's front page. Let me pin down its actual "References Cited" list and the related proceedings.

I'll ground this analysis in the actual prior-art references tied to this patent. Let me pull the "References Cited" data and the key cited documents.

Let me pull the actual "References Cited" list for the '850 patent and confirm the key secondary references.

Obviousness Analysis — U.S. Patent No. 6,227,850 B1 ("Teeth viewing system") under 35 U.S.C. § 103

Scope note. This builds on the previously generated sections (bibliographic data, claim map, litigation history). I do not repeat them. I rely on the same claim reproduction caveat those sections flagged: the authoritative full text provided to me is truncated inside the Detailed Description and therefore contains no claim section, so the claim elements below are taken from the secondary reproduction identified earlier (2 independent claims — 1 and 20; 38 total). Verify claim text against the USPTO/Google Patents claims before relying on any element-by-element mapping.

Source-availability limitation (be explicit). The Google Patents fetch supplied to me for US6227850 strips the "References Cited" block. I therefore reconstructed the prior art of record for this family from the patent documents that reprint it (e.g., the US 8,930,219 and US 11,911,971 reference lists, and the ITC exhibit reproducing the Chishti specification). I also hit a tool step limit before I could retrieve (a) the full text of US 5,338,198 and (b) the exhibit list of IPR2025-00817. Statements about those two items are flagged as lower confidence.

I. Governing law and the critical date

Critical-date flag — this is the single most consequential issue for any § 103 attack. The previously generated summary already flagged a priority-date discrepancy (patent record says 1999-05-13; a third-party database says 1999-05-12 — immaterial). The material discrepancy is a second one that the family data surfaces:

• The AR027482A1 and TW480166B family members are listed on the Google Patents page with a priority date of 1998-10-08, i.e., they claim the 8 October 1998 U.S. applications Ser. Nos. 09/169,036 and 09/169,034.
• But the '850's own record shows only one priority application — US 09/313,290, filed 1999-05-13.
• The '850 specification describes the two October 1998 applications only as "related to" and "incorporated herein by reference," not as priority claims.

If the '850 is entitled only to 13 May 1999, then WO 00/19929 (published 2000-04-13, claiming the October 1998 filings) is not § 102(a)/(b) art, and the § 102(b) window opens 13 May 1998. Every reference I use below is on the face of the patent family and issued well before 13 May 1998, so the analysis is robust either way. This is deliberate — it removes the priority dispute as a variable.

II. The prior art of record (all pre-critical-date)

Excluded from the § 103 combination — do not use: US 5,975,893 (Chishti et al., filed 1997-10-08, issued 1999-11-02) and the WO 00/19929 applications (Chishti et al., filed 1998-10-08). Both are commonly owned with the '850 by Align Technology. Under pre-AIA § 103(c), commonly owned § 102(e)/(f)/(g) art is disqualified as prior art for obviousness. (They remain available to show the background state of the art, but a competent analysis — or an opponent's competent rebuttal — will invoke § 103(c) the moment they are used as § 103 references. Note also that WO 00/19929 published 2000-04-13, after the '850's filing date, so it is not § 102(a)/(b) art at all.)

This matters strategically: it means the treatment-path/animation element must be met with third-party art (Andreiko), not with Align's own Chishti path-generation work. Andreiko supplies it (see § IV.B).

III. Independent claim 1 (and claim 20): element-by-element

Recall the six elements of claim 1 (per the earlier section): (a) capture 3-D data of the patient's teeth; (b) determine a viewpoint; (c) apply a positional transformation to the 3-D data based on the viewpoint; (d) render the orthodontic view; (e) determine a treatment path for each tooth; (f) update the representation to display tooth position along the paths. Claim 20 is the same sequence as executable instructions.

A. Elements (a)–(d): rendered by Andreiko '562 alone, or Kuroda '459 alone, or the two in combination

Andreiko '562. The family specification (identical across '562/'243/'289/'861) states that the system provides "preferably scanning a model of the patient's mouth to produce two or three dimensional images and digitizing contours and selected points," and that "three dimensional imaging of the teeth and jaw of the patient is carried out with laser or other scanner to form full three dimensional images of the teeth and jaw of the patient," with data also obtainable "directly from the patient using CAT scans, MRI, positron emission tomography or other technique." That is element (a) verbatim in substance.

For elements (b)–(d), the same specification discloses computer-graphic displays of the 3-D data: "FIGS. 3-3C are illustrations of graphics computer images produced in the input procedure," including "an example of a portion of a three dimensional digital image, illustrated in perspective," and it expressly discloses rotating the image: "When such images are rotated to a horizontal plan view, a derivation of the same information that is available from the video imager … may be derived." Rotating a 3-D digital image into a selected plan view is determining a viewpoint and applying a positional (rotation) transformation to the 3-D data to render a view. Elements (b), (c), (d) are disclosed.

Kuroda '459 independently supplies the same elements with an explicit display step. Its flowchart includes "PROFILE ACQUIRING," "REPRESENTATIVE PLANE FORMING" (cutting out individual teeth from the digitized data), "ARRANGING" the teeth on an ideal-arch guide line, "DH LINE HEIGHT ADJUSTING," "INCLINATION ANGLE ADJUSTING," and then two separate "MONITOR DISPLAY" steps. A non-contact "three-dimensional profile analyzer utilizing an irradiation beam" performs the capture. Element (a) ✔, and the display of a rearranged digital tooth arrangement ✔.

Wu '198 / Duret '288 are corroborating, not necessary: laser scanning of a molded tooth to produce a 3-D model (Wu), and optical 3-D digitization with computer display (Duret), are both recited as known in the '850 specification itself.

B. Elements (e)–(f): the treatment path and the updating display — supplied by Andreiko

This is where the applicant might argue novelty. It fails.

Andreiko's family expressly claims and describes successive intermediate steps. US 6,244,861 (same specification) claim 4 recites "manufacturing a series of arcuate components … for successively treating the teeth … in successive steps from the pretreatment positions … by successive substitution of the arcuate components," and claim 5 recites "a series of archwires of progressively increasing stiffness." The analysis procedure (FIGS. 2L–2O; steps 800/1000/1100) computes "finish positions of the mandibular teeth," then fits maxillary teeth to them. A series of increments from initial to finish positions consists of, by definition, a path of per-tooth positions between the initial and final arrangements.

Element (f) — updating a graphical representation to show tooth position along those paths — is then the union of Andreiko's display capability with its own successive-step disclosure. Nothing more than outputting each successive computed arrangement to the same graphics display already disclosed.

That the '850's specific animation depends on generated intermediate data sets (the INTDDS of its FIG. 1) is not a distinguishing limitation, because claim 1 recites only "determin[ing] a treatment path" and "updat[ing] the graphical representation to visually display the position of the teeth along the treatment paths." It does not recite how the path is generated, and the specification cannot import unclaimed limitations into the claim (In re Self, 671 F.2d 1344 (CCPA 1982)).

C. Result for claim 1/20

Combination 1 (primary § 103 rejection): Andreiko '562 (or '861/'289/'243) + Kuroda '459. Andreiko supplies 3-D capture, the virtual viewpoint/rotation-to-a-selected-view step, computer rendering of the 3-D tooth model in perspective, and a series of successive tooth arrangements; Kuroda supplies digitized per-tooth isolation and an affirmative monitor-display step for a computer-rearranged dental set-up. Claim 1 and claim 20 would have been obvious.

IV. Dependent claims

A. Claims 2–9 and 18 (and 21–28, 37) — the eight named orthodontic views

These claims recite nothing more than camera placement at named positions: right buccal overjet, anterior overjet, left buccal overjet, left distal molar, left lingual, lingual incisor, right lingual, right distal molar (plus "orthodontic-specific viewing angles" in claim 18/37).

Once the clinician's data set is in a 3-D rendering system with a user-selectable viewpoint (Andreiko's rotation-to-plan-view; Kuroda's monitor display; or any of the countless general-purpose 3-D graphics packages of the mid-1990s), choosing which direction to look from is the paradigm of a design choice with a predictable result. The motivation is on the face of the field: these are the standard diagnostic views of clinical orthodontics. The Angle classification of malocclusion (a right/left buccal interdigitation assessment) dates to 1899; cusp–fossa relationships, midline evaluation, and overjet/overbite assessment are the orthodontist's canonical examination steps. Kuroda itself arranges teeth against a "guide line descriptive of an ideal individual dental arch form" and determines an "occlusal plane"; Andreiko computes "cusp tips," "marginal ridges," and "occlusal" relationships. An artisan asked to build a viewer for such a system would place the virtual camera buccally, lingually, occlusally, and incisally as a matter of routine because those are the directions from which the clinically relevant relationships are visible.

KSR Type (D) and (F) rationale: applying a known technique (camera placement in a 3-D renderer) to a known device (the digital dental model) that was ready for improvement, in response to a known clinical need, with predictable results.

Sub-point directly against the patent: claim 18/37's "orthodontic-specific viewing angles" are indistinguishable from the specific views of claims 2–9 and add no separate limitation. And the patent's own disclosure confirms the claimed mechanism is routine graphics: the FIG. 6 pseudo-code is standard perspective-camera math — a LookFrom point, a LookAt point, an up vector, and a field-of-view term used as 0.25*MAX(X_Length, Y_Length)/tan(HalfFieldOfView). That is textbook camera-placement mathematics with the bounding box of the dental mold substituted for the scene bounds.

B. Claim 10 (and 29) — render at positions corresponding to a selected data set

Disclosed by Kuroda (display of the arranged set-up) and Andreiko (display of the initial video/3-D image and of the calculated finish arrangement — both are "selected" data sets for the same patient). Obvious.

C. Claim 11 (and 30) — level-of-detail compression

Level-of-detail (LOD) rendering — progressively substituting higher-resolution geometry as the viewer approaches or as time permits — was thoroughly conventional in real-time 3-D graphics by May 1998 (flight simulators, CAD/CAE viewers, medical imaging workstations). The motivation for applying it here is stated by the patent itself: "reduce[] the time required to generate a single rendered image … and the time required to display a rendered image on the screen after the download has begun." Reducing rendering latency by LOD is a known technique applied to a known device ready for improvement (KSR Type (C)), with precisely the predictable result obtained. The LOD technique and the dental viewer are analogous arts in the sense that both require interactive display of large polygon meshes.

D. Claims 12 and 13 (and 31, 32) — user modifies the graphical representation, and the modification propagates to the underlying data set

Disclosed or rendered obvious by Andreiko, whose stated method includes interactive selection of points from the displayed image with "a pointing device and digitizer," and by Kuroda, whose set-up is digitally rearranged and re-displayed in an iterative workflow. Interactive direct-manipulation editing of a CAD model with propagation to the model database was a baseline expectation of 1990s CAD. Obvious.

E. Claim 14 (and 33) — VCR-metaphor animation controls

Transport controls modeled on a videocassette recorder (play, step forward, step back, fast-forward, rewind, scrub bar) were a ubiquitous, long-established user-interface convention by 1998 — for animation playback, for medical image sequences, and for computer-based training. Applying that convention to playback of a sequence of computed tooth arrangements (Andreiko's successive steps) is the substitution of one known element for another to obtain a predictable result. Obvious.

(Note: the earlier section flagged a drafting informality — "animation" lacks antecedent basis in claims 14/33. That is an indefiniteness/§ 112 concern, not a § 103 one, and does not help the patent on obviousness.)

F. Claim 15 (and 34) — render from only a portion of the data set

Conventional culling / masking / selective-load practices in 3-D rendering; and the '850 itself concedes the technique ("the viewer program applies rules of orthodontic relevance to determine which areas of the image can be rendered at lower quality"). Obvious.

G. Claims 16 and 17 (and 35, 36) — click a tooth, read information about it, including its motion along the path

Pick-select on a rendered 3-D object, followed by a database/dialog lookup keyed to the selected object's identifier, is conventional GUI practice. The information content (tooth type, adjacent-tooth distance, forces, movement between steps) is precisely the data the prior art already computes: Kuroda computes per-tooth heights and inclination angles and inter-tooth arrangement; Andreiko computes per-tooth finish positions, archforms, and appliance geometry. The only "new" step is displaying already-computed per-tooth values on demand — a predictable, design-driven aggregation. Obvious. (The spec's mention of finite-element force calculation is not claimed and cannot add weight.)

H. Claim 19 (and 38) — 3-D gyroscopic input device alters tooth orientation in the representation

Disclosed by US 5,440,326 (Quinn). Quinn expressly teaches a hand-held gyroscopic pointer whose "third rotational signal can be used to either rotate a displayed object or to display or simulate a third dimension," and that the yaw-derived angle "could be … rotation of the cursor or a cursor-selected object or for providing a 'z' input for a three dimensional display or a two-dimensional display simulating a three dimensional view." Rotating a displayed 3-D object is exactly what claim 19/38 recites, and a digitally rendered tooth model is a displayed object. The '850 specification itself cites this very patent for the gyroscopic pointing device. One-reference § 103 (or § 102) exposure here is real; the motivation is supplied by Quinn directly — a free-space rotational input is a natural fit for free-space rotational viewing of a 3-D model.

V. Alternative primary references (for redundancy in a rejection)

A § 103 rejection need not rest on one combination. Any of these works as the primary:

1. Andreiko '562 family (primary) + Kuroda '459 — § III, above.
2. Kuroda '459 (primary) + a general-purpose 3-D graphics rendering system + Andreiko for the successive-steps element. Kuroda already displays a computer-rearranged digital set-up on a monitor; the increment is the camera/viewpoint machinery, which is generic graphics.
3. Wu '338,198 or Duret '288 (primary, 3-D dental digitization + display) + Andreiko (finish positions and successive appliances) + Kuroda (per-tooth digital rearrangement). Same result; lower confidence on Wu's content (§ X).

All three primaries are § 102(b) art (issued more than one year before the earliest plausible filing date), so none is exposed to the § 103(c) common-ownership disqualification.

VI. Articulated motivations to combine (MPEP § 2143 rationales)

For each combination above, at least four independent rationales apply:

1. Same field of endeavor, same problem. Andreiko, Kuroda, Wu, and Duret all address building and using a digital three-dimensional model of a patient's teeth for orthodontic treatment; the '850 addresses viewing that model. Combining a display technique with a data-generation technique in the same field is the "simple substitution of one known element for another" and the "use of a known technique to improve similar devices in the same way" (KSR; MPEP § 2143(A), (C)).
2. The prior art itself teaches the need. Kuroda's stated object is to eliminate the labor and time of manually making a set-up model, and it delivers the result on a monitor. Andreiko's stated object is to remove guesswork and dependence on the orthodontist's "mental vision" of finish positions. Both identify exactly the problems the '850's Background recites ("trial-and-error," "mental model," "difficult to explain the expected result to the patient in words"). Where the references identify the same deficiency and the improvement is a display of the digital model, the motivation is supplied by the references.
3. Known clinical need fixes the viewpoint. The eight views in claims 2–9 exist because they are the standard orthodontic diagnostic directions. The artisan does not need hindsight to arrive at them; he needs only the ordinary knowledge of the field.
4. Design incentives and predictable results. LOD, culling, pick-select, transport controls, and free-space rotational input are all selections from a finite, identified set of well-known UI/rendering techniques with predictable effects on speed and interactivity — KSR's "obvious to try" branch applies squarely.

Critical framing point for the whole analysis: the '850's stated advantages — that a user "need not possess in-depth knowledge of parameters associated with a patient dental data capture system," need not have "expertise in 3D software," and that treatment plans can be "expressed more clearly" to patients — are not claim limitations. No claim requires that the user be shielded from 3-D parameters or that the interface be usable by a non-specialist. Under In re Self and the Phillips claim-construction framework, these benefits carry no patentable weight and cannot supply the inventive step. This, in my view, is the decisive weakness: once the unclaimed "ease of use" narrative is stripped away, the claims reduce to applying a camera, a set of clinically standard viewpoints, standard rendering optimizations, and standard UI conventions to a digital tooth model that the prior art already produced.

VII. Where the § 103 case is weakest (and how a patent owner would respond)

Being candid about the counterarguments:

1. Claim 19/38 — the gyroscopic-input claim is the strongest for a challenger; claims 2–9/21–28 (the named views) are the next strongest. Claim 1/20 as a whole is weaker only in the sense that it requires assembling three references. If a challenger must prevail on a single claim, target 19/38 or the view claims; if the goal is to reach claim 1, use Andreiko as primary and treat the graphics elements as admitted conventional (the specification's repeated use of "conventional" — "a conventional 'marching cubes' technique," "A conventional smoothing operation," "a conventional smoothing operation can be used" — is an admission of ordinary skill in the art that can be used against the patent).
2. Proof gap on the claim text. As flagged in the prior sections, the exact claim wording for claims 1 and 20 (in particular whether the "treatment path" element includes any structural or temporal limitation) is unverified against a primary source. If the issued claim is narrower than the reproduction suggests — e.g., if a claim requires the path itself to be generated by the viewer program rather than merely received — the combination must be re-cut, though Andreiko's successive-substitution disclosure likely still covers it.
3. Secondary considerations. No evidence of record that I found (in the previously generated sections) shows a nexus between a claimed element and any commercial success, long-felt need, or industry praise. Absent a nexus, Align's commercial success with Invisalign carries no weight. Conversely, if the patent owner can show copying (relevant given the ITC/OrthoClear history), that cuts the other way — but copying of an already-known viewer feature is weak secondary evidence.
4. Expiration moots the practical stakes. The '850 expired 2019-05-13 (per the previously generated sections), so any § 103 challenge today runs only against its use as prior art — which is in fact how it appears in IPR2025-00817 (Ex-1020, against US 10,791,936). In that posture, the obviousness of the '850's own claims matters only for the weight and enabling disclosure of Ex-1020, not for validity of the '850 itself.

VIII. Explicit uncertainties

• Claim text. Unverified against a primary source (the supplied full text is truncated before the claims). The element-by-element mapping above is only as good as the reproduced claim language.
• US 5,338,198 (Wu). I could not retrieve its full text; the characterization "laser scanning of a molded tooth to produce a three-dimensional model" comes from how later patents (including the '850 family's own reference list and Align's later patents) describe it. Treat the Wu content statements as moderate confidence.
• IPR2025-00817 exhibit list. I hit a tool limit before retrieving it and therefore cannot tell you which prior-art references the petitioner selected or how it charted them. My combinations are independently derived from the '850's own prior-art of record; they are not verifications of any IPR theory.
• Priority/§ 103(c) analysis. My conclusion that US 5,975,893 and WO 00/19929 are disqualified as § 103 references rests on (i) the common ownership of record and (ii) the '850's apparent lack of an October 1998 priority claim. If Align in fact perfected a domestic priority chain to 08 October 1998, the § 103(c) point becomes largely academic but the critical date analysis shifts — so confirm the file wrapper.
• No reexamination evidence found for the '850 (per the earlier section) — so there is no Office-cited § 103 rejection to compare against.
• No 2026 assertion of the '850 was found; consistent with its 2019 expiration.

Bottom line. Claims 1 and 20, construed on the claim text as reproduced, would have been prima facie obvious over Andreiko (US 5,431,562 and its continuations) in view of Kuroda (US 5,605,459), with the rendering-optimization and UI claims obvious over well-known 3-D graphics and interface practices, and claim 19/38 obvious over US 5,440,326 (Quinn) alone. The patent's principal defense — that it made 3-D orthodontic visualization usable by a non-specialist — is not reflected in any claim and therefore supplies no inventive step.