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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- US65506720 cases6/8 sections
I'll run a few targeted searches to check for any current USPTO/CAFC activity on this exact number, then summarize. Let me try to capture the remaining claims and check for any active 2026 litigation/docket activity. Search / docket check…
View full analysis →added 9/24/2026 - US65532120 cases6/8 sections
I'll search for the specific patent number and check for any litigation or CAFC docket activity. Let me run more targeted searches on the patent number and any litigation involving it. Let me check for any litigation specifically asserting…
View full analysis →added 9/20/2026 - US65561570 cases6/8 sections
I'll search for authoritative information on US 6,556,157, including any litigation activity. US Patent 6,556,157 — Summary Searches performed: USPTO/Google Patents, FreePatentsOnline, Justia Patents, and a CAFC 2026 docket sweep. The…
View full analysis →added 9/24/2026 - US65643800 cases6/8 sections
I'll search for authoritative information on this patent, including any litigation activity. USPTO / CAFC Search Report — US Patent No. 6564380 Identifier verified literally: 6564380 (US6564380B1). Sources: Google Patents…
View full analysis →added 9/26/2026 - US65661180 cases6/8 sections
I'll search for authoritative information on US 6566118, including any 2026 litigation activity. Let me search specifically for litigation/docket activity and the claim text. Let me pull the full claim set and check for any PTAB/IPR or…
View full analysis →added 9/24/2026 - US65712180 cases6/8 sections
I'll verify the patent's current status and check for any 2026 CAFC activity before summarizing. US Patent 6,571,218 — Verification Note I ran searches against Google Patents, FreePatentsOnline, Justia, and uspto.report for the exact…
View full analysis →added 9/26/2026 - US65773280 cases6/8 sections
I'll verify current status via search, then summarize from the authoritative full text provided. US Patent 6,577,328 — Verification Summary Source grounding: Full text and bibliographic data from Google Patents…
View full analysis →added 9/24/2026 - US6580650 cases6/8 sections
Search Results & Identification Patent under review: US658065A (U.S. Patent No. 658,065) — Universal joint. I searched the USPTO/Google Patents record and CAFC 2026 docket coverage. No CAFC 2026 docket entries reference patent 658,065 —…
View full analysis →added 9/4/2026 - US65818330 cases6/8 sections
I'll search for this specific patent number and check for any CAFC 2026 litigation activity. Let me verify the claim structure and check for any CAFC litigation activity involving this patent. Let me do a final targeted check for any…
View full analysis →added 9/27/2026 - US65845080 cases6/8 sections
I'll verify details against live sources, then summarize. Verification note I cross-checked the patent text you supplied against Google Patents, Justia, FreePatentsOnline, and the USPTO-hosted PDF. All bibliographic fields below are…
View full analysis →added 9/26/2026 - US65877250 cases6/8 sections
I'll search for authoritative information on this specific patent number, including any litigation or CAFC docket activity. Let me check for any litigation or CAFC docket activity specific to this patent. US 6,587,725 B1 — Summary…
View full analysis →added 9/26/2026 - US65918080 cases6/8 sections
I'll verify this patent against the USPTO record and check for any 2026 CAFC activity before summarizing. Verification note I searched for US 6591808 specifically (patent number, title, and US 6,591,808 formats). The authoritative full…
View full analysis →added 9/23/2026 - US65922070 cases6/8 sections
I'll search for this specific patent number across available sources. Let me check specifically for any 2026 CAFC litigation activity involving this patent. Let me try to retrieve the actual abstract text and confirm the claim set. US…
View full analysis →added 9/24/2026 - US65931230 cases6/8 sections
I'll search for information on this specific patent number, including any 2026 litigation activity. Let me run one more targeted check for any litigation or CAFC activity specifically involving this patent. Let me retrieve the actual claim…
View full analysis →added 9/24/2026 - US65943480 cases6/8 sections
I'll search for the specific patent number in USPTO and CAFC contexts. Let me run a couple more targeted searches to confirm litigation/docket status and current ownership. US Patent 6,594,348 B1 — Summary Searches run: (1) USPTO/Google…
View full analysis →added 9/24/2026 - US65946540 cases6/8 sections
I'll search for litigation and docket information on this specific patent number. Let me check for litigation involving the assignee and retrieve the full claim set. Let me try to retrieve the full claim set to identify all independent…
View full analysis →added 9/24/2026 - US65987910 cases6/8 sections
I'll search for authoritative information on US 6,598,791, including any litigation/docket activity. Let me run additional targeted searches for litigation and docket activity involving this patent. Let me check litigation databases and…
View full analysis →added 9/30/2026 - US66009960 cases6/8 sections
I'll search for information on this patent, including any litigation dockets. Let me check for the actual claim text and any litigation involving this patent. Let me verify the full claim set from an additional source. US Patent 6,600,996…
View full analysis →added 9/30/2026 - US66017590 cases6/8 sections
I'll search for this specific patent and any related appellate docket activity. Let me run more targeted searches to check for litigation/appellate activity and confirm bibliographic data. Let me check specifically for litigation or PTAB…
View full analysis →added 9/26/2026 - US66041350 cases6/8 sections
I'll run targeted searches to verify the patent record and check for any litigation or CAFC activity. Let me check for the actual claim text and any litigation involving this specific patent. Let me try to retrieve the actual claim set and…
View full analysis →added 9/24/2026