The catalog
Patent invalidity dossiers.
7,220 patents in the database, sorted by number of on-file litigation cases. Of these, 2,988 have at least one tracked case across 6,606 litigations.
Demand letter analyzer
You got a patent demand letter. Now what?
Paste the letter — we extract the asserted patents, identify the asserter, characterize their litigation history, flag validity vulnerabilities, and draft a sample response letter your attorney can review. Free, private, ~2-3 minutes.
Analyze a patent
Drop a US patent number — we’ll verify it on Google Patents and generate the full invalidity dossier.
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I'll search for authoritative information on US 5891636, including any litigation or Federal Circuit activity. The general litigation search returned unrelated "589" patents, so let me run targeted searches for this specific patent number…
View full analysis →added 9/10/2026I'll search for information on this patent number, including any 2026 CAFC docket activity. Let me run a couple of targeted searches on litigation/appeal activity specific to this patent number. US Patent 5,907,830 — "Electronic coupon…
View full analysis →added 10/1/2026I'll search for authoritative information on this patent, including any 2026 CAFC docket activity. US 5,923,908 — Verification Summary Bottom line on your two database requests: I confirmed the patent bibliographic data and the…
View full analysis →added 9/29/2026I'll verify against live sources before summarizing. Let me try to retrieve the rest of the claim set, since the fetched text truncates mid-claim 10. Verified identification — US 5,975,893 I confirmed the number against the authoritative…
View full analysis →added 9/29/2026I'll search for authoritative information on this patent number. Let me verify the patent's legal/prosecution record and litigation history. Let me do a final targeted check for any 2026 appellate activity and confirm the official record…
View full analysis →added 9/30/2026I'll search for this specific patent in the USPTO database and CAFC dockets. I have the bibliographic data confirmed. Now let me retrieve the full claims and check for CAFC litigation involving this patent. I have litigation context. Now…
View full analysis →added 8/27/2026I'll search for authoritative information on this patent, including any litigation activity, then summarize. Let me check for litigation history and confirm the CAFC docket situation. US Patent 6,018,041 — Analyst Summary Scope note on…
View full analysis →added 9/30/2026I'll verify the patent against current sources, including any 2026 litigation activity, before summarizing. Let me check for litigation history and any 2026 appellate activity specifically. US Patent 6,046,979 — Analyst Summary Source of…
View full analysis →added 9/12/2026I'll run targeted searches for this specific patent number before summarizing. Let me check the known Federal Circuit appeal and confirm no 2026 activity specific to this patent. Search coverage and caveats I ran targeted searches against…
View full analysis →added 9/28/2026I'll run targeted searches for the patent number and any 2026 CAFC activity before summarizing. Let me check for any Federal Circuit appeal activity tied to the 2014 Delaware case and any 2026 records. One more check for any reexamination…
View full analysis →added 9/12/2026US Patent 6,118,776 — Summary Note on sourcing: The full patent text was provided in the brief and matches the USPTO/Google Patents record. I also verified bibliographic data and the complete claim set via EveryPatent.com…
View full analysis →added 9/9/2026I'll search for this patent and related litigation, then summarize. Let me check for any 2026 CAFC activity involving this patent. Search results for US 6,119,171 — exclusively I ran targeted queries on the patent number itself and on its…
View full analysis →added 9/26/2026I'll run targeted searches for this specific patent number, including the CAFC docket angle. Let me check the CAFC docket and any 2026 activity specifically. Let me make one more check for any recent (2025–2026) docket activity before…
View full analysis →added 9/24/2026I'll search for authoritative information on this patent. Let me check the litigation dockets and assignment history for this specific patent. US Patent 6,157,436 — Summary Sources used: Google Patents full-text record…
View full analysis →added 9/29/2026I'll run targeted searches on the patent number and any associated litigation/docket records. Let me check litigation/docket records and any 2026 CAFC activity. Let me check for the IPR outcome and any 2026 activity. US Patent 6,211,907 B1…
View full analysis →added 9/30/2026US Patent 6,213,587 — Search Results Summary Caveat on sources My direct USPTO-database query returned no results from the tool, and I found no CAFC 2026 docket in which U.S. Patent 6,213,587 is itself the patent-in-suit or the challenged…
View full analysis →added 9/3/2026I'll search for this specific patent number across the sources you named. Now let me check for CAFC 2026 dockets and litigation involving this patent. Search results for US Patent No. 6,219,439 Important caveat up front: I did not obtain…
View full analysis →added 9/24/2026I'll verify the patent record and check for any current litigation/docket activity. US Patent 6,240,346 B1 — Summary Important caveat up front: my web searches for "6240346" surfaced different identifiers that happen to share the same…
View full analysis →added 9/24/2026I'll verify the patent details and check for any litigation/docket activity. US Patent 6,240,394 B1 — Verification Summary Note on scope: I searched for the exact identifier "6240394" and confirmed the record against Google Patents…
View full analysis →added 10/1/2026I'll search for the specific patent 6243115 in USPTO records and CAFC dockets. Let me search specifically for any CAFC (Federal Circuit) appeal activity, including 2026 dockets, tied to patent 6,243,115. Summary of U.S. Patent 6,243,115 B1…
View full analysis →added 9/3/2026