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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  • US4353060
    0 cases6/8 sections

    I'll search for litigation/docket activity and corroborating records for this patent number. Search results — US 4,353,060 Litigation / CAFC docket check: I ran targeted searches for 4353060 in connection with CAFC 2026 dockets and…

    View full analysis →added 9/30/2026
  • US4354273
    0 cases6/8 sections

    I'll verify the patent's current status and check for any litigation or CAFC docket activity involving this specific number. US 4,354,273 — Verified Summary Important caveat on scope of my checks: The searchable public sources I can reach…

    View full analysis →added 9/26/2026
  • US4375108
    0 cases6/8 sections

    I'll run targeted searches for this exact patent number. Let me check for any litigation or appellate activity involving this patent. US 4,375,108 — Verified Record Search scope note: I queried the web for the exact identifiers. I found…

    View full analysis →added 9/24/2026
  • US4380154
    0 cases6/8 sections

    I'll search for authoritative information on US 4380154, including any 2026 CAFC activity. Let me run targeted searches for litigation/docket activity and an alternate identifier check. US Patent 4,380,154 — "Clean Coal Power System"…

    View full analysis →added 9/26/2026
  • US4385393
    0 cases6/8 sections

    I'll run targeted searches for this patent number, including the litigation/docket angle you asked about. Both searches returned empty. Let me try alternate query formulations. Let me run one final check specifically on litigation/docket…

    View full analysis →added 9/16/2026
  • US4409758
    0 cases6/8 sections

    I'll verify this patent against live sources and check for any litigation activity. Let me check for any litigation or Federal Circuit activity involving this patent or its assignee. US Patent 4,409,758 — Verification Report ⚠️ Scope note…

    View full analysis →added 9/24/2026
  • US4414209
    0 cases6/8 sections

    I'll search for authoritative information on US patent 4414209 and any related 2026 litigation. Let me dig into litigation history and the 2026 court docket question. Let me check the litigation family reference and any historical…

    View full analysis →added 9/24/2026
  • US4419734
    0 cases6/8 sections

    I'll search for this specific patent number as instructed. Let me run a couple more targeted searches to check for litigation and to confirm bibliographic details. Let me try to retrieve the complete claim set to identify all independent…

    View full analysis →added 9/30/2026
  • US4425235
    0 cases6/8 sections

    I'll run targeted searches to check for any USPTO records or 2026 CAFC docket activity tied specifically to 4,425,235 before summarizing. US Patent 4,425,235 — Summary Searches performed: I searched for the exact number in the context of…

    View full analysis →added 9/30/2026
  • US4428001
    0 cases6/8 sections

    I'll run a couple of targeted searches, then summarize the patent from the authoritative full text provided. Search limitation (stated up front) Two caveats on the "database" requirement: - USPTO PatentCenter/PAIR and CAFC dockets were not…

    View full analysis →added 9/24/2026
  • US4431282
    0 cases6/8 sections

    I'll verify the current status of this specific patent number before summarizing. Search results — US 4431282 Searches performed: US patent 4431282 (no results returned), "4431282" patent diapositives strip cassette (results confirming the…

    View full analysis →added 9/27/2026
  • US4440675
    0 cases6/8 sections

    I'll run a few targeted searches for this exact patent number and its current docket status. Let me check for any litigation or CAFC docket activity involving this patent number. Search methodology and caveats I ran web searches for the…

    View full analysis →added 9/30/2026
  • US4464997
    0 cases6/8 sections

    I'll search for authoritative information on this patent number, including any litigation or docket activity. Let me check for any litigation, PTAB, or CAFC activity involving this patent. US 4,464,997 — Verification Summary Important…

    View full analysis →added 9/24/2026
  • US4471421
    0 cases6/8 sections

    I'll search for authoritative information on this specific patent number. Let me search specifically for the patent's claims, since the provided text ends before the claims section. Let me check whether there are additional claims beyond…

    View full analysis →added 9/30/2026
  • US4472875
    0 cases6/8 sections

    I'll research US patent 4472875 across USPTO and litigation sources. Let me run additional targeted checks for any litigation or later activity involving this patent. US Patent 4,472,875 — Analyst Summary Source of record: Full text…

    View full analysis →added 9/24/2026
  • US4481574
    0 cases6/8 sections

    I'll run the requested searches, then summarize against the authoritative patent text I have. Searches run - US4481574 patent Programmable interface between remote terminals and a computer — confirmed the patent's identity, full text, and…

    View full analysis →added 9/25/2026
  • US4484557
    0 cases6/8 sections

    I'll run targeted searches for this specific patent number across USPTO and CAFC sources. US Patent 4,484,557 — Analyst Summary Search note / scope caveat: My searches were run through a general web-search tool, not a direct, authenticated…

    View full analysis →added 9/24/2026
  • US4486090
    0 cases6/8 sections

    I'll search for authoritative information on this patent, including any CAFC/litigation activity. US 4,486,090 — Verification Summary Search scope note: I ran web searches intended to reach USPTO/Justia/Google Patents records and CAFC…

    View full analysis →added 9/24/2026
  • US4496352
    0 cases6/8 sections

    I'll search for authoritative records on this patent number, then summarize. US 4,496,352 — Record Check and Summary Search results first: litigation status I searched for litigation and Federal Circuit docket activity involving 4,496,352…

    View full analysis →added 9/28/2026
  • US4504592
    0 cases6/8 sections

    I'll search for this patent number across USPTO and litigation sources. Let me verify litigation/litigation-adjacent sources for this specific patent. US Patent 4,504,592 — Verification Summary Grounding note: I confirmed the bibliographic…

    View full analysis →added 9/29/2026