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.
By industry
- US55355310 cases6/8 sections
I'll search for litigations, dockets, and USPTO records for US 5,535,531. Let me run additional targeted searches for litigation/docket activity and USPTO records. Patent Analysis: US 5,535,531 — "Shoelace Rapid Tightening Apparatus"…
View full analysis →added 9/26/2026 - US55371070 cases6/8 sections
I'll search for this specific patent and check for any litigation activity. Let me check for litigation and docket activity specific to this patent number. US 5,537,107 — Screening Summary Search scope note: I searched Google Patents…
View full analysis →added 9/24/2026 - US55403010 cases6/8 sections
I'll search for authoritative information on this patent, including any litigation activity. Let me verify the litigation/assignment status more specifically. US Patent 5,540,301 — Analyst Summary Search scope note: I searched for the…
View full analysis →added 9/24/2026 - US55447210 cases6/8 sections
I'll search for authoritative information on this specific patent number, including any litigation activity. US Patent 5,544,721 — Analyst Summary Source of record: Full patent text fetched from Google Patents…
View full analysis →added 9/24/2026 - US55487210 cases6/8 sections
I'll search for litigation and docket information on this patent, then summarize. US 5,548,721 — Verified Summary Searches run: Google Patents full text (authoritative), Justia, FreePatentsOnline, EveryPatent, PatentImages PDF, PlusSite…
View full analysis →added 9/25/2026 - US55509620 cases6/8 sections
I'll search for the specific patent number and any related litigation or CAFC docket activity. US 5,550,962 — Verification Summary Search scope & confidence note. I searched for the exact number 5550962 / 5,550,962 against patent databases…
View full analysis →added 9/26/2026 - US55559610 cases6/8 sections
I'll search for this specific patent number to check for any litigation or docket activity, then summarize. Let me run a couple more targeted searches for any litigation or CAFC activity. US 5,555,961 — "On the go gear shifter" Scope note…
View full analysis →added 9/24/2026 - US55567570 cases6/8 sections
I'll search for this patent in the requested databases. Let me gather the full claim set and check the CAFC docket specifically. Let me pull the actual claim set from the patent record. US Patent 5,556,757 — Summary Important scope note on…
View full analysis →added 9/27/2026 - US55597900 cases6/8 sections
I'll search for authoritative information on US patent 5559790, including any recent CAFC docket activity. Let me check for litigation and any 2026 CAFC activity specific to this patent. Let me do a final targeted check for any litigation…
View full analysis →added 9/28/2026 - US55627200 cases6/8 sections
I'll verify this patent against live sources, including any 2026 litigation activity. Let me check for litigation activity and pull the exact claim text. Let me retrieve the exact claims text and check for any 2026 litigation. US Patent…
View full analysis →added 9/24/2026 - US55632350 cases6/8 sections
I'll search for authoritative records on US 5563235, including any litigation or CAFC activity. US Patent 5,563,235 — Analyst Summary Search scope note: I searched for the literal number 5563235 across web-indexed USPTO/Google…
View full analysis →added 9/24/2026 - US55661680 cases6/8 sections
I'll verify the patent details against current sources, including any litigation activity. US Patent 5,566,168 — Verification Summary Search performed: Google Patents / FreePatentsOnline / USPTO.report / EPO Global Patent Index / UPC &…
View full analysis →added 9/26/2026 - US55726530 cases6/8 sections
I'll search for authoritative information on US 5,572,653, including any 2026 CAFC activity. Let me check for any litigation or 2026 appellate activity involving this patent and its owner. US 5,572,653 — Verified Summary Important caveat…
View full analysis →added 9/24/2026 - US55772090 cases6/8 sections
I'll run the requested searches now. Let me verify the litigation/docket angle with a couple more targeted searches. US Patent 5,577,209 — Summary Searches run: I queried for "USPTO patent 5577209," "CAFC 2026 docket patent 5577209,"…
View full analysis →added 9/24/2026 - US55837270 cases6/8 sections
I'll search for authoritative information on US 5583727, including any litigation activity. Let me check specifically for litigation activity and any CAFC dockets. US 5583727 — Summary Important preliminary note on search scope: I searched…
View full analysis →added 9/24/2026 - US55840170 cases6/8 sections
I'll search for the patent and any related litigation/docket records before summarizing. US Patent 5,584,017 — Summary Scope note first (important): I do not have a direct, authenticated connection to the USPTO PatentCenter/PAIR or to the…
View full analysis →added 9/24/2026 - US55860630 cases6/8 sections
I'll verify against live sources before summarizing. US 5,586,063 — Verification and Summary Note on sources and scope: I ran the requested searches but did not have direct credentialed access to the USPTO Patent Center/Patent Public…
View full analysis →added 9/24/2026 - US55861770 cases6/8 sections
I'll search for this patent and check both USPTO and CAFC records. Let me verify the bibliographic details and check specifically for any litigation or CAFC activity. Let me retrieve the actual claim text to accurately summarize the…
View full analysis →added 9/24/2026 - US55880560 cases6/8 sections
I'll search for authoritative information on this specific patent number, including any litigation or docket activity. Let me verify the claim structure and check for any litigation specific to this patent number. Let me verify the total…
View full analysis →added 9/26/2026 - US55888360 cases6/8 sections
I'll verify against live sources before summarizing. Verification summary — US 5,588,836 I ran targeted searches against Google Patents, FreePatentsOnline, EveryPatent, the patent PDF, and CAFC 2026 argument/docket material. I found no…
View full analysis →added 9/26/2026