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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- US47718400 cases6/8 sections
I'll search for authoritative information on US patent 4771840, including any CAFC 2026 activity. Let me run additional targeted checks for any litigation or CAFC activity involving this specific patent number. US Patent 4,771,840 —…
View full analysis →added 9/24/2026 - US47775970 cases6/8 sections
I'll search for authoritative records on this patent number, including USPTO/CAFC docket activity. Let me check specifically for any litigation or Federal Circuit docket activity. Summary: US Patent 4,777,597 Important disambiguation note…
View full analysis →added 9/26/2026 - US47779900 cases6/8 sections
I'll search for this patent number, then summarize. US 4,777,990 — Summary Bottom line: I found no litigation, and no 2026 CAFC docket activity, involving US 4,777,990. My two searches returned the patent itself (Google Patents…
View full analysis →added 9/30/2026 - US47918070 cases6/8 sections
I'll verify this patent against live sources before summarizing. Verification note I ran targeted searches for the literal number 4791807 against the patent corpus and against 2026 Federal Circuit material. The patent text below is drawn…
View full analysis →added 9/26/2026 - US47919050 cases6/8 sections
I'll search for information on this specific patent number and check for any CAFC 2026 docket activity. Let me do more targeted searches to confirm or rule out any CAFC 2026 activity involving this specific patent. US Patent 4,791,905 —…
View full analysis →added 9/30/2026 - US47920180 cases6/8 sections
I'll search for authoritative information on this specific patent number. Let me check for any current litigation or PTAB/Court of Appeals activity. Let me verify the patent's legal status and check for any recent proceedings tied to that…
View full analysis →added 9/24/2026 - US47981900 cases6/8 sections
I'll search for current authoritative information on this patent before summarizing. US Patent 4,798,190 — "Nozzle" Sourcing caveat: I could not query USPTO PatentCenter or the CAFC docket system directly from this environment. The…
View full analysis →added 9/24/2026 - US48001590 cases6/8 sections
I'll search for litigation and docket information on this specific patent number, then compile the summary. Let me do a more targeted search for any 2026 court activity. Let me try to retrieve the actual claim text. Search results first…
View full analysis →added 9/29/2026 - US48067740 cases6/8 sections
I'll run several searches to gather authoritative information on US 4806774, including any litigation activity. Let me search for the actual claim text and any litigation/docket activity. US 4,806,774 — Verification Summary Important…
View full analysis →added 9/30/2026 - US48128200 cases6/8 sections
I'll verify this patent number against live sources and check for any litigation activity. US Patent 4,812,820 — Analyst Summary Ground truth note: All identifiers below are taken literally from the authoritative full text and from live…
View full analysis →added 9/30/2026 - US48333080 cases6/8 sections
I'll search for this specific patent number across USPTO and court resources. Now let me check for any court dockets (CAFC or district court) referencing this patent. Certification / grounding note All identifiers below are read literally…
View full analysis →added 9/24/2026 - US48465520 cases6/8 sections
I'll verify the patent number and check for any 2026 litigation activity before summarizing. Let me run one more targeted check for litigation/docket activity and any maintenance-fee status. Verification note on scope I was able to confirm…
View full analysis →added 9/30/2026 - US48662570 cases6/8 sections
I'll search for current information on this patent, including any CAFC 2026 docket activity. Let me check for any litigation or appellate activity specifically. Summary — US Patent 4,866,257 Note on search scope: I searched for US…
View full analysis →added 9/28/2026 - US48682890 cases6/8 sections
I'll search for current information on this patent number, including any litigation activity. Let me check for any litigation or CAFC docket activity involving this patent. Let me get the full claim set to accurately describe the…
View full analysis →added 9/26/2026 - US48825850 cases6/8 sections
I'll verify the patent details and check for any litigation or CAFC docket activity. Let me check for any litigation or CAFC docket references specifically. US Patent 4,882,585 — Verified Summary Important scope note up front: The…
View full analysis →added 9/16/2026 - US48867410 cases6/8 sections
I'll run searches to check for USPTO records and any CAFC 2026 docket activity for this specific patent number. Search scope and result I searched for the literal identifier 4886741 / US 4,886,741 against patent databases (Google Patents…
View full analysis →added 9/30/2026 - US48886950 cases6/8 sections
I'll search for authoritative information on US patent 4888695, including any litigation activity. Let me search for litigation and USPTO records specifically tied to this patent number. Let me do one more targeted check for any litigation…
View full analysis →added 9/30/2026 - US48917810 cases6/8 sections
I'll search for authoritative information on US 4891781, including any 2026 CAFC activity. Now let me check for any litigation or CAFC 2026 docket activity involving this patent. US 4,891,781 — "Modulo Arithmetic Processor Chip" Identifier…
View full analysis →added 9/28/2026 - US48943660 cases6/8 sections
I'll verify against the authoritative text I have and run searches for the docket/litigation angle. The general searches didn't surface any 2026 CAFC or USPTO proceeding tied to this number. Let me try to pin down the claim set and any…
View full analysis →added 9/24/2026 - US49042610 cases6/8 sections
I'll run targeted searches for this patent number, its litigation/docket trail, and its family members. Let me check specifically for any litigation or CAFC docket activity, and confirm the legal status. Search result summary — US…
View full analysis →added 9/26/2026