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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  • US6061797
    0 cases6/8 sections

    I'll search for authoritative information on this specific patent, including any CAFC 2026 docket activity. Let me verify litigation/docket activity and confirm the bibliographic details from additional sources. US Patent 6,061,797 —…

    View full analysis →added 9/24/2026
  • US6069558
    0 cases6/8 sections

    I'll verify the patent against live sources before summarizing. Let me run targeted searches. Let me check for any litigation, assignments, or Federal Circuit activity specifically tied to this patent number. US Patent 6,069,558 — Summary…

    View full analysis →added 9/28/2026
  • US6073675
    0 cases6/8 sections

    I'll search for authoritative records on US 6,073,675, including any litigation or CAFC activity. Let me run one more targeted check on litigation/docket records and the patent's current legal status. US Patent 6,073,675 — Summary…

    View full analysis →added 9/24/2026
  • US6081237
    0 cases6/8 sections

    I'll search for this patent number across the requested sources. Let me specifically check for any 2026 CAFC docket activity and confirm the litigation posture. US Patent 6,081,237 — "Antenna/Mirror Combination Apparatus" Sourcing note: I…

    View full analysis →added 9/28/2026
  • US6081514
    0 cases6/8 sections

    I'll search for authoritative information on US 6,081,514. Search scope and confidence I searched for the specific number 6,081,514 (and the unpunctuated form 6081514) across patent databases and for any 2026 Federal Circuit (CAFC) docket…

    View full analysis →added 9/27/2026
  • US6088356
    0 cases6/8 sections

    I'll search for authoritative information on this patent number, including any 2026 CAFC activity. Let me check specifically for litigation and any 2026 appellate activity involving this patent. US Patent 6,088,356 — Verified Summary…

    View full analysis →added 9/30/2026
  • US6088450
    0 cases6/8 sections

    I'll search for the patent's litigation history and verify details. Let me run a few targeted searches. Let me check for litigation and any Federal Circuit activity specifically involving this patent number. Summary of US Patent 6,088,450…

    View full analysis →added 9/30/2026
  • US6088796
    0 cases6/8 sections

    I'll run several targeted searches in parallel — for the patent itself, its claims, and any 2026 CAFC activity. Let me confirm whether any 2026 litigation or Federal Circuit activity exists for this number specifically. US 6,088,796 —…

    View full analysis →added 9/24/2026
  • US6090925
    0 cases6/8 sections

    I'll verify the patent's identity and check for any litigation/docket activity before summarizing. Let me pull the claim text and check for any litigation activity specifically tied to this patent. US 6,090,925 — verification and summary…

    View full analysis →added 9/27/2026
  • US6091507
    0 cases6/8 sections

    I'll search for authoritative information on US patent 6091507, including any litigation/docket activity. Let me run additional targeted searches for litigation and docket records. US Patent 6,091,507 — Analyst Summary Search scope note /…

    View full analysis →added 9/27/2026
  • US6091720
    0 cases6/8 sections

    I'll search for authoritative information on US 6091720, including any 2026 CAFC activity. US Patent 6,091,720 — Analysis Sourcing note I searched for the patent on the open web (Google Patents, FreePatentsOnline, Justia, patentimages…

    View full analysis →added 9/27/2026
  • US6100114
    0 cases6/8 sections

    I'll search for authoritative information on US 6,100,114, including any CAFC docket activity. Let me check for any litigation or CAFC activity involving this patent specifically. US Patent 6,100,114 — Search Results and Summary Search…

    View full analysis →added 9/11/2026
  • US6101452
    0 cases6/8 sections

    I'll search for authoritative information on this patent, including its claims and any litigation status. Let me get the remaining claims and check for any litigation. Let me retrieve the text of independent claim 20 and verify litigation…

    View full analysis →added 9/24/2026
  • US6101468
    0 cases6/8 sections

    I'll research US 6,101,468 with targeted searches, then reconcile against the authoritative full-text I already have. Now let me check for any litigation or CAFC 2026 docket activity specific to this patent number. Let me verify the total…

    View full analysis →added 9/24/2026
  • US6102528
    0 cases6/8 sections

    I'll search for information on this patent number, including any litigation or docket activity. US Patent 6,102,528 — Analyst Summary Search scope note: I queried for the exact string 6102528 / 6,102,528 against patent-full-text…

    View full analysis →added 9/24/2026
  • US6104834
    0 cases6/8 sections

    I'll verify the patent details against live sources, including any recent litigation activity. Summary: US Patent 6,104,834 Title: Matching CCITT compressed document images Patent number: 6,104,834 (granted from Application No. 08/695,825)…

    View full analysis →added 9/26/2026
  • US6105027
    0 cases6/8 sections

    I'll search for authoritative records on US 6,105,027 across USPTO and litigation sources. Now let me look for the claims text and any litigation/CAFC activity. Let me search for the actual claim text and any litigation involving this…

    View full analysis →added 9/24/2026
  • US6108266
    0 cases6/8 sections

    I'll search for authoritative information on this specific patent, including any litigation activity. Let me run targeted searches on litigation and validity challenges for this specific patent number. Let me verify whether this specific…

    View full analysis →added 9/20/2026
  • US6108594
    0 cases6/8 sections

    I'll research US patent 6108594 across USPTO sources and Federal Circuit dockets. Now let me check for any litigation or Federal Circuit activity involving this patent. US Patent 6,108,594 — Summary Important scoping note up front: I…

    View full analysis →added 9/24/2026
  • US6119235
    0 cases6/8 sections

    I'll search for current litigation/assignment records on this patent number, then summarize against the authoritative text provided. US 6,119,235 — Search Results & Summary Search scope and confidence note I searched for this specific…

    View full analysis →added 9/25/2026