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
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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- US43530600 cases6/8 sections
I'll search for litigation/docket activity and corroborating records for this patent number. Search results — US 4,353,060 Litigation / CAFC docket check: I ran targeted searches for 4353060 in connection with CAFC 2026 dockets and…
View full analysis →added 9/30/2026 - US43542730 cases6/8 sections
I'll verify the patent's current status and check for any litigation or CAFC docket activity involving this specific number. US 4,354,273 — Verified Summary Important caveat on scope of my checks: The searchable public sources I can reach…
View full analysis →added 9/26/2026 - US43751080 cases6/8 sections
I'll run targeted searches for this exact patent number. Let me check for any litigation or appellate activity involving this patent. US 4,375,108 — Verified Record Search scope note: I queried the web for the exact identifiers. I found…
View full analysis →added 9/24/2026 - US43801540 cases6/8 sections
I'll search for authoritative information on US 4380154, including any 2026 CAFC activity. Let me run targeted searches for litigation/docket activity and an alternate identifier check. US Patent 4,380,154 — "Clean Coal Power System"…
View full analysis →added 9/26/2026 - US43853930 cases6/8 sections
I'll run targeted searches for this patent number, including the litigation/docket angle you asked about. Both searches returned empty. Let me try alternate query formulations. Let me run one final check specifically on litigation/docket…
View full analysis →added 9/16/2026 - US44097580 cases6/8 sections
I'll verify this patent against live sources and check for any litigation activity. Let me check for any litigation or Federal Circuit activity involving this patent or its assignee. US Patent 4,409,758 — Verification Report ⚠️ Scope note…
View full analysis →added 9/24/2026 - US44142090 cases6/8 sections
I'll search for authoritative information on US patent 4414209 and any related 2026 litigation. Let me dig into litigation history and the 2026 court docket question. Let me check the litigation family reference and any historical…
View full analysis →added 9/24/2026 - US44197340 cases6/8 sections
I'll search for this specific patent number as instructed. Let me run a couple more targeted searches to check for litigation and to confirm bibliographic details. Let me try to retrieve the complete claim set to identify all independent…
View full analysis →added 9/30/2026 - US44252350 cases6/8 sections
I'll run targeted searches to check for any USPTO records or 2026 CAFC docket activity tied specifically to 4,425,235 before summarizing. US Patent 4,425,235 — Summary Searches performed: I searched for the exact number in the context of…
View full analysis →added 9/30/2026 - US44280010 cases6/8 sections
I'll run a couple of targeted searches, then summarize the patent from the authoritative full text provided. Search limitation (stated up front) Two caveats on the "database" requirement: - USPTO PatentCenter/PAIR and CAFC dockets were not…
View full analysis →added 9/24/2026 - US44312820 cases6/8 sections
I'll verify the current status of this specific patent number before summarizing. Search results — US 4431282 Searches performed: US patent 4431282 (no results returned), "4431282" patent diapositives strip cassette (results confirming the…
View full analysis →added 9/27/2026 - US44406750 cases6/8 sections
I'll run a few targeted searches for this exact patent number and its current docket status. Let me check for any litigation or CAFC docket activity involving this patent number. Search methodology and caveats I ran web searches for the…
View full analysis →added 9/30/2026 - US44649970 cases6/8 sections
I'll search for authoritative information on this patent number, including any litigation or docket activity. Let me check for any litigation, PTAB, or CAFC activity involving this patent. US 4,464,997 — Verification Summary Important…
View full analysis →added 9/24/2026 - US44714210 cases6/8 sections
I'll search for authoritative information on this specific patent number. Let me search specifically for the patent's claims, since the provided text ends before the claims section. Let me check whether there are additional claims beyond…
View full analysis →added 9/30/2026 - US44728750 cases6/8 sections
I'll research US patent 4472875 across USPTO and litigation sources. Let me run additional targeted checks for any litigation or later activity involving this patent. US Patent 4,472,875 — Analyst Summary Source of record: Full text…
View full analysis →added 9/24/2026 - US44815740 cases6/8 sections
I'll run the requested searches, then summarize against the authoritative patent text I have. Searches run - US4481574 patent Programmable interface between remote terminals and a computer — confirmed the patent's identity, full text, and…
View full analysis →added 9/25/2026 - US44845570 cases6/8 sections
I'll run targeted searches for this specific patent number across USPTO and CAFC sources. US Patent 4,484,557 — Analyst Summary Search note / scope caveat: My searches were run through a general web-search tool, not a direct, authenticated…
View full analysis →added 9/24/2026 - US44860900 cases6/8 sections
I'll search for authoritative information on this patent, including any CAFC/litigation activity. US 4,486,090 — Verification Summary Search scope note: I ran web searches intended to reach USPTO/Justia/Google Patents records and CAFC…
View full analysis →added 9/24/2026 - US44963520 cases6/8 sections
I'll search for authoritative records on this patent number, then summarize. US 4,496,352 — Record Check and Summary Search results first: litigation status I searched for litigation and Federal Circuit docket activity involving 4,496,352…
View full analysis →added 9/28/2026 - US45045920 cases6/8 sections
I'll search for this patent number across USPTO and litigation sources. Let me verify litigation/litigation-adjacent sources for this specific patent. US Patent 4,504,592 — Verification Summary Grounding note: I confirmed the bibliographic…
View full analysis →added 9/29/2026