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.

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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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  • US6310639
    0 cases6/8 sections

    I'll search for this specific patent number and any related litigation. Let me run a few more targeted searches to check for any 2026 litigation or administrative activity. US Patent 6,310,639 — Analyst Summary Source of record: Google…

    View full analysis →added 9/28/2026
  • US6312106
    0 cases6/8 sections

    I'll run targeted searches for this patent, including litigation/docket checks. Now let me check for litigation and any 2026 CAFC activity. One more check for PTAB/IPR or district court activity. Search Report — US Patent 6,312,106 Search…

    View full analysis →added 9/30/2026
  • US6314406
    0 cases6/8 sections

    I'll ground this in live sources before summarizing. Let me pull the abstract/claims directly and check for 2026 litigation activity. Let me try to retrieve the actual claim language and confirm litigation status. US 6,314,406 B1 —…

    View full analysis →added 9/24/2026
  • US6315554
    0 cases6/8 sections

    I'll search for this specific patent in litigation and official databases, then summarize. Summary — US Patent 6,315,554 B1 Important caveat on scope of search: I searched for this specific number (not similar numbers) against patent…

    View full analysis →added 10/1/2026
  • US6321158
    0 cases6/8 sections

    I'll search for authoritative information on this patent number and check for any litigation/docket activity. Let me pull the claim text and check for litigation/docket activity. Let me try to get the actual claim text and check for any…

    View full analysis →added 9/24/2026
  • US6324172
    0 cases6/8 sections

    I'll search for information about US Patent 6,324,172 in the USPTO database and any CAFC 2026 docket activity. The CAFC docket search returned no results. Let me run additional targeted searches to confirm there's no litigation or CAFC…

    View full analysis →added 9/9/2026
  • US6324607
    0 cases6/8 sections

    I'll search for authoritative information on this patent number. Search scope and method I queried for the exact number 6,324,607, with targeted runs against patent-family, USPTO-report, Espacenet/EPO and Federal Circuit docket sources…

    View full analysis →added 9/24/2026
  • US632572
    0 cases6/8 sections

    I'll run targeted searches on the literal patent number 632572 across USPTO and CAFC-related sources. Initial searches returned nothing on point. Let me try more specific queries. Let me verify the assignee/ownership record and check the…

    View full analysis →added 9/24/2026
  • US6329143
    0 cases6/8 sections

    I'll run several targeted searches for this exact patent number. Let me try to retrieve the actual claim text and check for any 2026 CAFC activity. Summary — US 6,329,143 B1 Verification status: I confirmed the patent number, title, and…

    View full analysis →added 9/26/2026
  • US6331049
    0 cases6/8 sections

    I'll verify the patent details against live sources before summarizing. Let me check for any litigation or Federal Circuit activity involving this patent. Search scope and caveats I searched the open web (Google Patents full text, the…

    View full analysis →added 9/29/2026
  • US6332448
    0 cases6/8 sections

    I'll search for authoritative information on US patent 6332448, including any litigation or CAFC docket activity. Let me search specifically for litigation and CAFC docket activity involving this patent. Let me do a final targeted check…

    View full analysis →added 9/24/2026
  • US6344470
    0 cases6/8 sections

    I'll search for this specific patent number and any related litigation. Let me verify the abstract, full claim set, and check for any 2026 appellate activity. US Patent 6,344,470 — Analyst Summary Method note / scope: I could not reach a…

    View full analysis →added 10/1/2026
  • US6351381
    0 cases6/8 sections

    I'll search for the specific patent number and any related litigation. Let me check specifically for litigation or PTAB proceedings involving this patent number. US Patent 6,351,381 — Summary Important caveat on scope of search: I searched…

    View full analysis →added 9/26/2026
  • US6352879
    0 cases6/8 sections

    Summary of U.S. Patent 6,352,879 B1 Search note: I searched for the literal identifier "6352879" only. I disregarded the Japanese patent JP 6352879 B2 (an unrelated electroless platinum plating patent that surfaced in results) and other…

    View full analysis →added 9/3/2026
  • US6354496
    0 cases6/8 sections

    I'll run targeted searches for this specific patent number and for any 2026 CAFC activity. The CAFC search returned nothing. Let me try a few more angles to confirm whether any 2026 litigation/appeal activity exists. Let me check for any…

    View full analysis →added 9/17/2026
  • US6358892
    0 cases6/8 sections

    I'll search for authoritative information on US patent 6358892, including any litigation activity. Let me look for independent claims and any litigation/docket activity. Let me try to retrieve the actual claim set and check for any…

    View full analysis →added 9/24/2026
  • US6360208
    0 cases6/8 sections

    I'll search for the specific patent number and check for any litigation activity. Let me run more targeted searches for litigation and for the patent's specification/claims details. Let me do one final targeted check for any Federal…

    View full analysis →added 9/26/2026
  • US6365917
    0 cases6/8 sections

    I'll search for this specific patent number and check for any litigation activity. Let me search for the specific claims and any litigation records. Let me try to obtain the actual claim text for this patent. I could not retrieve one piece…

    View full analysis →added 9/24/2026
  • US6366578
    0 cases6/8 sections

    I'll search for authoritative information on US 6,366,578, including any 2026 CAFC docket activity. Let me search for the specific claim text and any litigation/docket activity. US 6,366,578 B1 — Verified Data Summary I searched Google…

    View full analysis →added 9/24/2026
  • US6366912
    0 cases6/8 sections

    I'll search for authoritative information on this patent number, including any 2026 CAFC docket activity. Let me run additional targeted searches to confirm whether any 2026 litigation or CAFC docket activity exists for this specific…

    View full analysis →added 9/29/2026