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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- US56276560 cases6/8 sections
I'll verify the patent details against live sources and check for any 2026 litigation activity. Let me check for any post-grant proceedings or litigation specific to this patent number. US Patent 5,627,656 — Analyst Summary Verification…
View full analysis →added 9/27/2026 - US56301480 cases6/8 sections
I'll search for authoritative information on this patent number, including any litigation or CAFC docket activity. Let me run one more targeted check on litigation/docket activity for this exact number. US 5,630,148 — Analyst Summary…
View full analysis →added 9/24/2026 - US56334250 cases6/8 sections
I'll search for the specific patent number to ground this summary. Let me try to retrieve the actual claim language. Let me try to pin down the full claim set. Summary — US 5,633,425 Confidence note up front: The bibliographic data below…
View full analysis →added 9/28/2026 - US56400020 cases6/8 sections
I'll search for authoritative information on this specific patent number. Let me verify the CAFC docket point and retrieve the abstract/claims text. Summary — US Patent 5,640,002 Bibliographic data (from the fetched full text and search…
View full analysis →added 9/24/2026 - US56400200 cases6/8 sections
I'll search for this specific patent number across patent databases and litigation dockets. Let me run a couple more targeted searches for litigation/CAFC activity and the patent family. US Patent 5,640,020 — Verified Summary Sourcing…
View full analysis →added 10/1/2026 - US56404210 cases6/8 sections
I'll research this patent across the requested sources. Let me check specifically for litigation and docket records. US Patent 5,640,421 — Research Summary Sources searched: Google Patents full-text…
View full analysis →added 9/28/2026 - US56416700 cases6/8 sections
I'll search for authoritative information on this patent number. US Patent 5,641,670 — Analyst Summary ⚠️ Sourcing / confidence note first I searched for this patent number specifically and took care not to substitute similar numbers…
View full analysis →added 9/29/2026 - US56477240 cases6/8 sections
I'll search for authoritative information on US 5,647,724 and check for any CAFC 2026 litigation activity. Now let me check for any 2026 CAFC docket activity and PTAB/litigation records involving this patent. Let me do one more targeted…
View full analysis →added 9/24/2026 - US56477430 cases6/8 sections
I'll search for authoritative information on this patent, including any 2026 litigation activity. Let me run a couple more targeted searches to confirm the bibliographic details and check for any litigation or PTAB activity. Summary: US…
View full analysis →added 9/24/2026 - US56529080 cases6/8 sections
I'll search for current information on this patent, including any litigation or docket activity. US Patent 5,652,908 — Analyst Summary Scope note: I searched for this specific number. The authoritative patent full text was supplied and is…
View full analysis →added 9/24/2026 - US56573320 cases6/8 sections
I'll search for authoritative information on this specific patent number. Search results for US 5,657,332 Important search note on identifier collisions: The string "5657332" also corresponds to JP 5657332 B2 (Japanese Patent No. 5657332…
View full analysis →added 9/27/2026 - US56573760 cases6/8 sections
I'll search for this specific patent number across the requested sources. Let me search more specifically for litigation and CAFC docket activity. Let me check for any litigation, PTAB proceedings, and current ownership of this specific…
View full analysis →added 9/24/2026 - US56642430 cases6/8 sections
I'll run several targeted searches — for the patent itself and for any CAFC 2026 docket activity involving it. Let me dig into the claim text and check specifically for any appellate/litigation activity. I have most of the claims (9–22)…
View full analysis →added 9/17/2026 - US56650690 cases6/8 sections
I'll search for authoritative information on this patent number. US Patent 5,665,069 — Verified Summary Bottom line: This is a real, easily-confirmed US patent. It is expired (lapsed in 2001 for nonpayment of maintenance fees), so it has…
View full analysis →added 9/24/2026 - US56688840 cases6/8 sections
I'll search for this specific patent number as requested. Let me search for any 2026 CAFC litigation activity and confirm the reissue lineage. US Patent 5,668,884 — Summary Important scope note: I searched for the specific number 5668884…
View full analysis →added 9/24/2026 - US56696850 cases6/8 sections
I'll search for authoritative information on this patent number, including any litigation or CAFC docket activity. Let me check specifically for litigation/PTAB/CAFC activity and confirm the granted patent metadata. Search results: USPTO /…
View full analysis →added 9/27/2026 - US56757170 cases6/8 sections
I'll search for current information on this patent number, including any litigation or CAFC docket activity. Let me check specifically for any litigation or court docket activity involving this patent. US Patent 5,675,717 — Analyst Summary…
View full analysis →added 9/24/2026 - US56801040 cases6/8 sections
I'll search for the specific patent number and any related litigation activity. Let me check specifically for litigation activity involving this patent. US Patent 5,680,104 — Search Results and Summary A note on method and my limitations…
View full analysis →added 9/24/2026 - US56934290 cases6/8 sections
I'll search for authoritative information on this patent, including any CAFC/litigation activity. Let me check specifically for litigation and CAFC docket activity. US 5,693,429 — Verified Summary Search scope performed: Google Patents…
View full analysis →added 9/29/2026 - US56994950 cases6/8 sections
I'll search for authoritative information on this patent number, including any 2026 litigation activity. Let me run a couple more targeted checks on litigation/docket activity for this specific number. US 5,699,495 — Verification Summary…
View full analysis →added 9/27/2026