The catalog
Patent invalidity dossiers.
7,237 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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I'll run targeted searches on this patent number across USPTO and CAFC sources. Let me check for any current (2026) CAFC docket activity and litigation involving this patent. Let me pull the full claim set to identify all independent…
View full analysis →added 9/29/2026I'll search for the specific patent number and any litigation/docket records, then summarize. Let me verify the exact independent claim language and check for any 2026 appellate activity. US Patent 6,281,230 — Summary (searched and…
View full analysis →added 10/1/2026- US6347087B12 cases →6/8 sections
I'll search for the specific patent number and any associated litigation/docket information. Let me verify litigation history and check for any Federal Circuit activity specific to this patent. Let me try to identify the second Delaware…
View full analysis →added 9/27/2026 US Patent 6,394,593 (US6394593B1) — Summary Bibliographic Data | Field | Information | Source / Confidence | |---|---|---| | Title | Vent system for ink jet pen having internal pressure regulator | Google Patents (authoritative text…
View full analysis →added 9/3/2026I'll search for authoritative information on US patent 6396599, including any recent litigation activity. Let me dig deeper on recent litigation and any CAFC appeals involving this specific patent. US Patent 6,396,599 — Summary Important…
View full analysis →added 9/29/2026I'll search for authoritative information on US patent 6398347, including any recent litigation activity. Let me check the appellate docket and any recent (2026) activity. US Patent 6,398,347 — Summary Identification (as printed on the…
View full analysis →added 10/1/2026I'll search for authoritative information on US patent 6420399 and check for any CAFC litigation. Let me search specifically for litigation and CAFC involvement for US 6,420,399. US Patent 6,420,399 B1 — Analyst Summary Sourcing note: My…
View full analysis →added 10/1/2026I'll search for authoritative information on US 6450807, including any 2026 CAFC activity. Let me run more targeted searches for any 2026 appellate activity and for the USPTO record. Let me do one final check for litigation/appellate…
View full analysis →added 9/29/2026I'll search for the specific patent number in USPTO and CAFC docket sources. The generic searches returned unrelated results (different patents). Let me run more targeted searches for the exact number and for CAFC 2026 docket activity. US…
View full analysis →added 9/26/2026I'll search for authoritative information on US patent 6473006, including any 2026 CAFC docket activity. Let me run a couple more targeted checks for any 2026 litigation or Federal Circuit activity involving this specific patent. US Patent…
View full analysis →added 10/1/2026I'll run targeted searches for this patent number and its litigation/docket presence. Let me check specifically for any 2026 CAFC docket activity and confirm the full claim set. US Patent 6,554,611 — Analyst Summary Important source note…
View full analysis →added 9/29/2026I'll start with targeted searches for this exact patent number and its litigation history. I found substantial results. Let me verify the claim set, abstract, and check for any 2026 litigation activity. I have the key litigation facts. Let…
View full analysis →added 9/29/2026I'll search for authoritative records on US 6,629,840, including any current litigation activity. Let me verify the reexamination certificate and check for any 2026 docket activity. Let me pin down the reexamination details and check for…
View full analysis →added 9/29/2026I'll search for authoritative information on this specific patent number. Let me verify the litigation history and check for any 2026 appellate docket activity. Let me try to retrieve the remaining claims (22–53) to confirm the full set of…
View full analysis →added 9/11/2026I'll verify current status and check for any 2026 CAFC activity for this specific patent number, then ground my summary in the authoritative patent text provided. US Patent 6,661,755 — "Optical disc apparatus" Important note on sourcing: I…
View full analysis →added 9/28/2026Patent Overview — US6684250B2 Title: Method and apparatus for estimating a geographic location of a networked entity Patent number: US6684250B2 (application US09/825,675) Inventors: Mark Anderson, Ajay Bansal, Brad Doctor, George…
View full analysis →added 9/24/2026I'll search for authoritative information on this patent number, including any 2026 CAFC docket activity. Let me search specifically for CAFC 2026 docket activity and litigation history. Let me do one final check for any 2026 activity and…
View full analysis →added 9/29/2026I'll run targeted searches for US 6725275, including any CAFC litigation related to it. Let me check for any CAFC litigation, including recent 2025–2026 dockets, involving this patent or its family. US Patent 6,725,275 — Analyst Summary…
View full analysis →added 9/28/2026I'll search for authoritative information on this patent, including any 2026 CAFC activity. Let me run additional targeted searches for USPTO records and any 2026 litigation/CAFC docket activity. Let me do a final check for any litigation…
View full analysis →added 9/27/2026I'll search for the specific patent number and any related court docket activity. Let me check the litigation history and any 2026 appellate activity more specifically. I found a possible 2026 Federal Circuit item. Let me verify whether it…
View full analysis →added 9/28/2026