The catalog
Patent invalidity dossiers.
7,175 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
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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 current information on this specific patent number. Let me dig deeper into the litigation history and any Federal Circuit activity. Let me check for any Federal Circuit appeals and current docket status. US Patent 5,818,801…
View full analysis →added 9/28/2026I'll search for this specific patent's records and any litigation/docket information. Let me verify the claim set and check for litigation history. Let me check for the specific litigation record and any recent appellate activity. US…
View full analysis →added 9/27/2026I'll search for this specific patent number and any associated litigation. Let me check for litigation involving this specific patent and verify assignee details. US Patent 5,835,366 — Summary Ground truth note: My searches located this…
View full analysis →added 10/1/2026I'll verify the patent identity and check for any litigation or CAFC 2026 activity before summarizing. US 5,842,040 — Verified Identification | Field | Value | |---|---| | Patent number | US 5,842,040 A (printed as "5,842,040") | | Title |…
View full analysis →added 9/20/2026I'll search for the patent and any related litigation activity. Interesting — the search surfaced an IPR involving TikTok and this patent. Let me dig into that and get the claim text. Let me get the actual claim text and double-check for…
View full analysis →added 9/24/2026I'll search for the specific patent number and any 2026 CAFC docket activity. Let me pull the patent's own claim text and check for any 2026 CAFC docket activity. Let me try to retrieve the patent's actual claim set and confirm whether any…
View full analysis →added 9/24/2026I'll search for this specific patent number in the USPTO/patent databases and check for any CAFC 2026 docket activity. Let me dig deeper on the CAFC 2026 docket question and the full claim set. Search results summary I ran searches against…
View full analysis →added 9/11/2026I'll search for authoritative information on this patent number. Let me run more targeted searches on the litigations and any recent activity. US Patent 5,879,936 — Summary Note on method/sources: I was asked to search the USPTO database…
View full analysis →added 9/27/2026I'll verify current information on this patent, including any 2026 CAFC activity, before summarizing. US 5,891,693 — verification note I ran targeted searches for the exact identifier 5891693 (and for any 2026 CAFC activity). No 2026…
View full analysis →added 9/27/2026I'll search for authoritative information on this patent and any 2026 CAFC activity. Let me verify the exact issued claim set and check for any 2026 appellate activity. US 5,902,723 — Analyst Summary Search scope note: I queried for the…
View full analysis →added 9/26/2026I'll search for information on this specific patent number and check for any litigation or docket activity. Let me run additional targeted checks for litigation, PTAB, or reexamination activity tied to this exact number. Search scope and…
View full analysis →added 10/1/2026I'll verify this patent against live sources before summarizing. Let me check litigation and any 2026 docket activity specifically for this patent. Let me get the full independent claim text to summarize accurately. Verification notes…
View full analysis →added 9/24/2026I'll search for authoritative information on this specific patent number, then cross-check against the full patent text provided. Let me run a couple more targeted searches to check for any litigation/CAFC records and confirm bibliographic…
View full analysis →added 9/28/2026I'll search for authoritative information on US 5981216, including any 2026 CAFC docket activity. Let me check the litigation reference found on the patent page and confirm no 2026 CAFC activity. US 5,981,216 — Analyst Summary Important…
View full analysis →added 9/27/2026I'll run several searches in parallel to gather authoritative information on this specific patent number. Let me search specifically for the claim text and any 2026 litigation activity. US Patent 5,991,389 — Analyst Summary Caveat on scope…
View full analysis →added 9/28/2026I'll run targeted searches for this patent number against USPTO sources and CAFC 2026 dockets. Let me refine the searches with more specific queries. Let me attempt to retrieve the actual claim text and check the CAFC docket specifically…
View full analysis →added 9/24/2026I'll verify the patent details against live sources before summarizing. Let me check the litigation signal and related family members, since the source page flagged family litigation. Let me check for any Federal Circuit / ITC activity and…
View full analysis →added 9/28/2026I'll search for this patent in USPTO records and CAFC 2026 dockets. Let me search specifically for litigation and CAFC docket activity. Let me check for any PTAB or appellate proceedings specifically on this patent number. Summary of US…
View full analysis →added 9/11/2026I'll verify this against live sources before summarizing. Now let me check the litigation/CAFC docket status specifically. US 6,038,711 — Verification Summary Source of record: the authoritative full text supplied in the prompt (Google…
View full analysis →added 9/26/2026I'll verify this against live sources before summarizing. Verification run (April 26, 2026) | Field | Value (as it appears in the authoritative google patents text supplied) | |---|---| | Patent number | US 6,040,193 A (no leading zero as…
View full analysis →added 9/11/2026