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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- US62754510 cases6/8 sections
I'll search for authoritative information on this patent, including any 2026 litigation activity. Let me run a few more targeted searches to check for any litigation or family/priority data. One more targeted check for court docket…
View full analysis →added 9/30/2026 - US62788370 cases6/8 sections
I'll search for litigation/docket information on this patent while relying on the authoritative patent text provided. Let me run targeted checks for litigation/docket records specific to this patent number. Findings: US Patent 6,278,837…
View full analysis →added 9/30/2026 - US6280580 cases6/8 sections
I'll run the requested searches before summarizing. Initial searches returned unrelated fire-extinguisher art. Let me tighten the queries. Let me try two more targeted queries on the inventor and on the CAFC docket system. Bottom line on…
View full analysis →added 9/24/2026 - US62853570 cases6/8 sections
I'll search for this specific patent number across the requested sources. Let me dig deeper on the patent's claims/abstract and check specifically for any 2026 CAFC activity. Let me verify the abstract text and full claim 1 language from…
View full analysis →added 9/29/2026 - US62857450 cases6/8 sections
I'll search for authoritative information on this patent, including any 2026 CAFC activity. Let me verify the claims and check for any litigation/CAFC activity. Let me confirm the full claim set and check for any PTAB/CAFC record. US…
View full analysis →added 9/24/2026 - US62860030 cases6/8 sections
I'll search for authoritative information on US patent 6286003 and check for any litigation activity. US Patent 6,286,003 — Analyst Summary Source of record: Full patent text from Google Patents…
View full analysis →added 9/24/2026 - US62860050 cases6/8 sections
I'll search for authoritative records on this patent number and check for any CAFC 2026 activity. Now let me check for CAFC 2026 litigation and obtain the actual claim text. Let me check the Nielsen Federal Circuit appeal in 2026 and try…
View full analysis →added 9/24/2026 - US62890230 cases6/8 sections
I'll search for authoritative information on US 6289023, including any recent litigation/docket activity. Let me check for any litigation or CAFC docket activity specifically tied to this patent. US 6,289,023 B1 — Analyst Summary…
View full analysis →added 9/24/2026 - US62911700 cases6/8 sections
I'll search for authoritative information on this patent number, including any 2026 litigation activity. Let me search further for litigation and docket information, and confirm the assignee details. Let me run a couple more targeted…
View full analysis →added 9/10/2026 - US62921980 cases6/8 sections
I'll search for authoritative information on this patent number. Let me run a couple more targeted searches to check for any litigation or docket activity. Search results — US 6,292,198 Important caveat on scope of search: I ran web…
View full analysis →added 10/1/2026 - US62927230 cases6/8 sections
I'll search for this specific patent number and check for any CAFC litigation activity. Let me verify whether there's any litigation or PTAB/Court activity specifically involving this patent. Search results: US Patent 6,292,723 No…
View full analysis →added 9/26/2026 - US62950550 cases6/8 sections
I'll search for this specific patent number and check for any 2026 litigation activity. Let me run more targeted searches on the litigation side. US 6,295,055 B1 — Identification and Summary Searches performed: web searches for US6295055…
View full analysis →added 9/29/2026 - US62952860 cases6/8 sections
I'll search for the specific patent number 6295286 in the USPTO and CAFC records. Let me check for any CAFC litigation records involving this patent and verify the USPTO bibliographic data. Let me do one final check specifically for CAFC…
View full analysis →added 9/9/2026 - US62973750 cases6/8 sections
I'll search for authoritative information on this patent number. Let me dig into the PTAB proceeding and any CAFC appeal involving this specific patent. Let me try to retrieve the actual claim text and check for any 2026 CAFC activity. US…
View full analysis →added 9/24/2026 - US62982920 cases6/8 sections
I'll search for this specific patent number in the requested sources. Let me run additional targeted searches to check USPTO records and any litigation involving this exact number. US 6,298,292 B1 — Search Summary Scope/sourcing note: I…
View full analysis →added 9/25/2026 - US63025040 cases6/8 sections
I'll search for this patent number as requested. Let me check for litigation/docket activity and claim details. Let me try to retrieve the claim text directly. Search scope and confidence notes I ran searches against Google Patents (which…
View full analysis →added 9/24/2026 - US63037900 cases6/8 sections
I'll search for this specific patent and any related litigation. US Patent 6,303,790 — Analyst Summary Important caveat on method: I could not directly query the USPTO Patent Public Search or the CAFC docket system through the tools…
View full analysis →added 9/24/2026 - US63045610 cases6/8 sections
I'll search for information about US Patent 6,304,561, including any USPTO records and CAFC docket activity. Let me do a couple more targeted searches to check for any CAFC or district-court litigation involving this specific patent…
View full analysis →added 9/9/2026 - US6306060 cases6/8 sections
I'll search for the specific identifier 630606 across patent and litigation sources. Let me run additional targeted searches to confirm the record and check the litigation docket angle. Let me do one final check for any litigation or…
View full analysis →added 9/24/2026 - US63105420 cases6/8 sections
I'll check for any current USPTO/litigation records on this specific number, then summarize from the authoritative patent text. US Patent 6,310,542 — Verification note first Search-scope caveat: I ran web-indexed searches against the…
View full analysis →added 9/24/2026