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 letter →

Analyze a patent

Drop a US patent number — we’ll verify it on Google Patents and generate the full invalidity dossier.

By industry

Software Technology & Computing Systems (T)(1343)Medical (M)(713)High-Tech (T)(550)Wireless Technologies(508)Semiconductor (T)(386)Automotive (A)(298)Industrial Manufacturing (IM)(295)Media & Broadcasting (T)(189)Biotechnology(153)Energy (E)(147)Optical Technology(144)Financial Technology (FT)(132)Sporting Goods (S)(84)Other (O)(73)Audio Technology(66)Consumer Durables(56)Home Appliance (HA)(48)Lighting (L)(47)Footwear(37)Agriculture (AG)(36)Firearms (F)(36)Gaming (G)(36)Food (FD)(35)Railroad(33)Home Security(31)Optical Communication(22)Audience Measurement(19)Plumbing(16)Baby Products(12)Printing Technology(10)Fire Safety (FS)(6)Retail Security(6)Telecommunications(5)Tech (T)(4)Aerospace(3)Aerospace (AS)(3)Printing Technology (P)(3)Aerospace (A)(2)Construction (C)(2)Printing (P)(2)Retail Technology (RT)(2)Telecommunications (T)(2)Telecommunications (TC)(2)Toys(2)Advertising (AD)(1)Aerospace (Ae)(1)Aviation(1)Aviation (AV)(1)Building & Construction(1)Building Construction (BC)(1)Building Materials(1)Chemical (C)(1)Chemical Sensing(1)Cosmetics (C)(1)Data Communication(1)Document Security(1)Electrical Components(1)Environmental Monitoring (EM)(1)Fencing(1)Fire Safety(1)Furniture (F)(1)High-Tech(1)Logistics (L)(1)Logistics & Shipping(1)Marine (M)(1)Maritime Logistics(1)Musical Instruments (MI)(1)Networking (N)(1)Office Equipment(1)Office Equipment (OE)(1)Paints & Coatings(1)Pet Products(1)Printing(1)Printing Technology (PT)(1)Retail Technology(1)Retail Technology (R)(1)Software Technology (T)(1)Textiles(1)Textiles (TX)(1)Tobacco (TB)(1)Vaping (V)(1)Video Surveillance(1)Video Technology(1)Water Treatment(1)
  • US6906741
    0 cases6/8 sections

    I'll search for this specific patent number, including any litigation or CAFC activity. US Patent 6,906,741 — Analyst Summary Search scope note: I searched for the exact number 6906741 across patent databases and…

    View full analysis →added 9/27/2026
  • US6908801
    0 cases6/8 sections

    I'll verify this patent's details and check for any 2026 CAFC docket activity. Let me check specifically for litigation or assignment records involving this exact patent number. Let me pull the full numbered claim set to identify the…

    View full analysis →added 9/29/2026
  • US6917821
    0 cases6/8 sections

    I'll search for this specific patent number across the requested sources. Let me run a few more targeted searches to confirm litigation/appeal status. Summary — US Patent 6,917,821 (rendered literally as "6917821") Note on interpretation…

    View full analysis →added 9/28/2026
  • US6920125
    0 cases6/8 sections

    US patent 6920125, titled "IP adaptation layer on backhaul connection of cellular network," provides a method and system for optimizing the transmission of small, frequently delivered data packets in a cellular network's backhaul…

    View full analysis →added 5/10/2026
  • US6922728
    0 cases6/8 sections

    US Patent 6,922,728 B2 — Summary Bibliographic Data (verified against patent front page and court-filed copies) | Field | Value | |---|---| | Patent No. | US 6,922,728 B2 (US6922728) | | Title | Optimal Internet Network Connecting and…

    View full analysis →added 8/31/2026
  • US6932842
    0 cases6/8 sections

    I'll search for this specific patent number across USPTO and court sources. Let me check for any litigation or CAFC activity specific to this patent. US 6,932,842 — Verification Summary Search scope & confidence note. I ran targeted…

    View full analysis →added 9/29/2026
  • US6941273
    0 cases6/8 sections

    I'll search for current information on this specific patent, including any 2026 CAFC docket activity. Let me check specifically for any 2026 litigation or CAFC docket activity involving this patent or its owner. US Patent 6,941,273 —…

    View full analysis →added 9/24/2026
  • US6950876
    0 cases6/8 sections

    I'll search for authoritative information on US patent 6950876, including USPTO records and any 2026 CAFC activity. Let me check for any litigation, PTAB, or Federal Circuit activity specifically involving this patent number. Let me…

    View full analysis →added 9/17/2026
  • US6952597
    0 cases6/8 sections

    I'll search for the specific patent number and any related litigation. US Patent 6,952,597 — Verified Summary Note on scope of search: I searched for this exact number (6,952,597) and its pre-grant publication US 2002/0137550 A1. I found…

    View full analysis →added 9/26/2026
  • US6952831
    0 cases6/8 sections

    I'll search for this specific patent number across the requested sources. Now let me check for any CAFC 2026 docket activity involving this patent number. US Patent 6,952,831 — Summary Sources searched: Google Patents full text…

    View full analysis →added 9/24/2026
  • US6954893
    0 cases6/8 sections

    I'll verify this specific patent number against live sources before summarizing. Let me pull the actual claim text and check for any 2026 CAFC activity. Let me try to retrieve the literal claim language, and one more check for…

    View full analysis →added 9/24/2026
  • US6957107
    0 cases6/8 sections

    I'll search for authoritative information on US 6,957,107 and any 2026 litigation activity. Let me verify the claim set and check for any 2026 litigation or PTAB activity specific to this patent. Let me retrieve the actual claim language…

    View full analysis →added 9/25/2026
  • US6961560
    0 cases6/8 sections

    I'll run several searches to check the USPTO record, the reissue, and any 2026 CAFC activity for this patent number. Let me check the reissue, the current assignee, and any litigation/CAFC activity specifically tied to this number. US…

    View full analysis →added 9/24/2026
  • US6963803
    0 cases6/8 sections

    I'll verify this against live sources, including any litigation activity. US Patent 6,963,803 — Verification Summary Search basis & caveat: I could not query USPTO PatentCenter or the CAFC docket system directly (no API access). I verified…

    View full analysis →added 9/24/2026
  • US6965175
    0 cases6/8 sections

    I'll verify current information on this patent via search, then summarize. Verification note up front I ran targeted searches on the exact string 6965175 / US6965175 rather than a family search. Results resolve to a single patent — US…

    View full analysis →added 9/24/2026
  • US697093
    0 cases6/8 sections

    I'll run searches against the provided sources and live web to verify. Now let me check the CAFC docket angle and confirm the USPTO record details. US 697,093 — Verification Summary Searches run: Google Patents record, the scanned…

    View full analysis →added 9/27/2026
  • US6971028
    0 cases6/8 sections

    I'll search for this patent number across the sources you mentioned. Let me pull the claim set and check for any 2026 CAFC activity specifically involving this number. Let me try to retrieve the actual claim text, since the provided full…

    View full analysis →added 9/24/2026
  • US6975005
    0 cases6/8 sections

    I'll search for authoritative records on US 6,975,005, including any 2026 CAFC activity. Let me run additional targeted searches on court activity and USPTO records. One more targeted check on any adversarial proceedings involving this…

    View full analysis →added 9/26/2026
  • US697770
    0 cases6/8 sections

    I'll run targeted searches on the exact identifier you gave, plus a deliberately separate query for the seven-digit look-alike so I can confirm I have not silently substituted it. One more pass to confirm the litigation angle before I…

    View full analysis →added 9/24/2026
  • US6978369
    0 cases6/8 sections

    I'll search for authoritative information on US patent 6978369, including any 2026 CAFC docket activity. Let me check for any CAFC 2026 docket or litigation activity specifically involving this patent. US Patent 6,978,369 — Analyst Summary…

    View full analysis →added 9/29/2026