The catalog

Patent invalidity dossiers.

7,244 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)
  • US9027447
    0 cases6/8 sections

    I'll search for this specific patent number, including any litigation activity. Let me run a few more targeted searches on litigation/docket activity for this patent. US Patent 9,027,447 — Analyst Summary Sourcing note: I searched for this…

    View full analysis →added 9/24/2026
  • US9030378
    0 cases6/8 sections

    I'll search for this specific patent number in litigation/docket databases and USPTO sources. Let me run more targeted searches for this specific patent. Let me do a final targeted check for any court proceedings. US Patent 9,030,378 —…

    View full analysis →added 9/24/2026
  • US9031883
    0 cases6/8 sections

    I'll verify key bibliographic details and check for any 2026 litigation activity before summarizing. Let me pull the actual claim set and check for any 2026 litigation activity. I have the specification. Now let me retrieve the actual…

    View full analysis →added 9/24/2026
  • US9041737
    0 cases6/8 sections

    I'll search for this specific patent number and check for any CAFC 2026 docket activity. Let me run more targeted searches for litigation and USPTO records. Let me do one more targeted check for any 2026 appellate activity involving this…

    View full analysis →added 9/24/2026
  • US9042502
    0 cases6/8 sections

    I'll search for this specific patent number and check for any 2026 litigation activity. Let me check specifically for any CAFC 2026 docket activity. US Patent 9,042,502 — Summary Searches performed (per your instruction to search…

    View full analysis →added 9/28/2026
  • US9042819
    0 cases6/8 sections

    I'll research US patent 9042819 across the USPTO and CAFC docket sources. Let me dig deeper into the claim text, assignee history, and any litigation. Let me check the PTAB proceeding and any related Federal Circuit appeal. US Patent…

    View full analysis →added 9/27/2026
  • US9043481
    0 cases6/8 sections

    US Patent 9043481, titled "Managed access to media services," was issued to Digital River Inc. on May 26, 2015, from an application filed on October 22, 2013. The patent lists Gyuchang Jun, Kurt Huang, and Duane Kuroda as its inventors…

    View full analysis →added 6/10/2026
  • US9048188
    0 cases6/8 sections

    I'll search for litigation and docket information on this patent, then summarize the patent itself from the authoritative text provided. Let me run a few more targeted checks for any litigation or appellate activity tied to this patent or…

    View full analysis →added 9/18/2026
  • US9052204
    0 cases6/8 sections

    I'll search for authoritative information on US patent 9052204, including any litigation or CAFC activity. The first search returned unrelated results (a chemistry patent). Let me run more targeted queries. Let me verify litigation/PTAB…

    View full analysis →added 9/24/2026
  • US9060724
    0 cases6/8 sections

    I'll search for this specific patent number and check for any litigation or CAFC docket activity. Let me run more targeted searches on this specific patent number and check whether it appears in any court docket. Let me check for any…

    View full analysis →added 9/22/2026
  • US9065609
    0 cases6/8 sections

    I'll search for the specific patent number and any related litigation/docket records. Let me run a few more targeted searches to check for any 2026 litigation or docket activity specifically naming this patent number. US Patent 9,065,609 —…

    View full analysis →added 9/26/2026
  • US9066327
    0 cases6/8 sections

    I'll search for this specific patent number and check for any litigation activity. Let me run a couple more targeted searches for litigation/assignment records. US 9,066,327 B2 — "Low Energy Wireless Proximity Pairing" Search scope note: I…

    View full analysis →added 9/22/2026
  • US9091533
    0 cases6/8 sections

    I'll run searches for this patent number on the specified sources. Let me check litigation/docket sources specifically. Let me run one more targeted check on the Federal Circuit docket and USPTO PTAB. US 9,091,533 — verified bibliographic…

    View full analysis →added 9/24/2026
  • US9100428
    0 cases6/8 sections

    I'll search for this patent and any related litigation. Let me verify the claim set and check specifically for litigation. One more check to pin down the claim set. US Patent 9,100,428 — Analyst Summary Scope note: I searched for the…

    View full analysis →added 9/26/2026
  • US9113337
    0 cases6/8 sections

    I'll search for authoritative information on US 9113337, including any 2026 CAFC activity. Let me check for litigation/CAFC activity and the full independent claim set. Let me try to retrieve the exact text of claim 1 and confirm there's…

    View full analysis →added 9/26/2026
  • US9115671
    0 cases6/8 sections

    I'll verify the patent details against the USPTO/live sources and check for any CAFC or district court activity. Let me run targeted checks on litigation dockets and any CAFC appeals specifically naming this patent. Let me check whether…

    View full analysis →added 9/24/2026
  • US9120023
    0 cases6/8 sections

    I'll verify this patent against live sources before summarizing. US 9,120,023 B1 — Verification & Summary Sourcing note: I confirmed the bibliographic data against the Google Patents record and the granted-patent PDF (front page). Where…

    View full analysis →added 9/24/2026
  • US9123034
    0 cases6/8 sections

    US Patent 9123034, titled "Methods and systems for electronic payment for parking using autonomous position sensing," was issued to TRANSPARENT WIRELESS SYSTEMS LLC. Here is a summary of the patent: Title: Methods and systems for…

    View full analysis →added 6/17/2026
  • US9123035
    0 cases6/8 sections

    Patent Overview — US 9,123,035 B2 Title: "Electric vehicle (EV) range extending charge systems, distributed networks of charge kiosks, and charge locating mobile apps." Patent number / application: US 9,123,035 B2; application US…

    View full analysis →added 9/30/2026
  • US9128632B2
    0 cases6/8 sections

    US patent 9128632B2, titled "Memory module with distributed data buffers and method of operation," was issued to Netlist Inc. on September 8, 2015, following a filing date of July 27, 2013. The inventors are Hyun Lee and Jayesh R. Bhakta…

    View full analysis →added 8/12/2026