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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- US54696230 cases6/8 sections
I'll search for docket/litigation information on this patent, then summarize. The searches returned no relevant results for this patent. Let me try one more targeted query. Search results — litigation / docket inquiry No results found. I…
View full analysis →added 9/24/2026 - US54703920 cases6/8 sections
I'll search for the specific patent number and any related litigation. US Patent 5,470,392 — Summary Important sourcing note: the USPTO full text provided to me is authoritative here, and I used it in preference to search snippets. A web…
View full analysis →added 9/26/2026 - US54710660 cases6/8 sections
I'll search for this specific patent number and check for any 2026 CAFC docket activity. Let me verify the full claim set and check specifically for any litigation or 2026 CAFC activity. US Patent 5,471,066 — Analysis Search coverage note…
View full analysis →added 9/16/2026 - US54789890 cases6/8 sections
I'll search for authoritative records on this patent number before summarizing. Summary — U.S. Patent No. 5,478,989 Important caveat up front: My searches of Google Patents, USPTO/PTAB records, and general web sources returned no Federal…
View full analysis →added 9/24/2026 - US54891720 cases6/8 sections
I'll run targeted searches for this patent number, including any CAFC 2026 activity. Let me run additional targeted searches on the patent and any litigation involving it or its inventor. Let me check specifically for any litigation or…
View full analysis →added 9/24/2026 - US54900600 cases6/8 sections
I'll run targeted searches for this specific patent number, including litigation checks. Let me pull the actual claim text and check for any litigation involving this assignee/patent. Let me pull the claim language directly and do a final…
View full analysis →added 9/24/2026 - US54917980 cases6/8 sections
I'll search for this specific patent number across the requested sources. Let me run a few more targeted checks to confirm litigation/PTAB activity status. US 5,491,798 — Verified Bibliographic Record Sources consulted: Google Patents…
View full analysis →added 9/24/2026 - US54974190 cases6/8 sections
I'll search for authoritative information on US 5,497,419, including any litigation or CAFC docket activity. Let me search for any current litigation or CAFC docket activity specifically involving this patent. Let me check for any PTAB…
View full analysis →added 9/24/2026 - US54978530 cases6/8 sections
I'll search for the specific patent number as requested. Let me run targeted searches for USPTO records and any CAFC 2026 docket activity. US Patent 5,497,853 — Summary Identification (verified against the patent text) | Field | Value |…
View full analysis →added 9/27/2026 - US55027660 cases6/8 sections
I'll search for authoritative information on this patent, including any litigation activity. Let me search specifically for litigation involving this patent and verify claim structure. Let me verify the full independent claim set, since…
View full analysis →added 9/26/2026 - US55104860 cases6/8 sections
I'll search for authoritative records on this specific patent number before summarizing. Let me check for any CAFC 2026 litigation involving this specific patent. Search scope and results I searched for the literal identifier 5510486 (US…
View full analysis →added 9/24/2026 - US55111490 cases6/8 sections
I'll search for this specific patent number across the requested sources. US 5,511,149 — Verified Summary Source grounding: patent full text was supplied in the prompt (Google Patents, fetched 2026‑09‑24) and my live searches corroborated…
View full analysis →added 9/24/2026 - US55139950 cases6/8 sections
I'll verify against live sources, then summarize from the authoritative full text provided. US 5,513,995 — Verification & Summary Verification note: I checked this against Google Patents (https://patents.google.com/patent/US5513995A/en)…
View full analysis →added 9/24/2026 - US55154800 cases6/8 sections
I'll research this patent across multiple sources. Let me check the claims in full and look specifically for any 2026 CAFC activity. Let me pull the full claim set directly. US Patent 5,515,480 — Research Summary Sources consulted: Google…
View full analysis →added 9/27/2026 - US55162860 cases6/8 sections
Summary — US Patent 5,516,286 Note on sourcing: The patent's full authoritative text was provided in the prompt (fetched from Google Patents on 2026-09-07), and a web search returned the USPTO-published patent-image PDF…
View full analysis →added 9/7/2026 - US55190920 cases6/8 sections
I'll search for litigation/assignment context on this specific patent number, then summarize from the authoritative full text provided. US Patent 5,519,092 — Summary Note on sourcing: The bibliographic and text details below come from the…
View full analysis →added 9/30/2026 - US55264140 cases6/8 sections
I'll search for authoritative information on this patent number, including any 2026 CAFC activity. Let me run a couple of targeted checks for any litigation or 2026 CAFC docket activity. US 5526414 — Summary Title: Dynamically controlled…
View full analysis →added 9/30/2026 - US55304670 cases6/8 sections
I'll search for this specific patent number, including any litigation or CAFC activity. Let me run more targeted searches for any litigation or administrative proceedings. Search scope and limitations I ran multiple queries against the…
View full analysis →added 10/1/2026 - US55330290 cases6/8 sections
I'll search the USPTO and CAFC 2026 docket sources for this specific patent number. Let me pull the actual claim set and run a more targeted CAFC docket check. I have partial claim text. Let me retrieve the full claim set (especially the…
View full analysis →added 9/26/2026 - US55353880 cases6/8 sections
I'll search for the specific patent number and any related litigation/docket activity. Search results for U.S. Patent No. 5,535,388 Search caveat up front: My live searches for "5535388" / "US5535388" against USPTO and CAFC sources…
View full analysis →added 9/24/2026