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)
  • US5728058
    0 cases1/8 sections

    Patent Overview — US5728058A, "Elastic knee wrap" Bibliographic data (from supplied text): Application US08/496,565; filed 1995-06-29; priority date 1995-06-29; granted/publication date 1998-03-17; status: Expired – Lifetime (anticipated…

    View full analysis →added 9/23/2026
  • US5728061
    0 cases1/8 sections

    Patent Overview — US 5,728,061 A Title: Device and Method for Treating Hydrocephalus Patent number / application: US 5,728,061 A; Application US 08/592,016 Inventor / Assignee: Abdul Mateen Ahmed; assignee listed as "Individual" (original…

    View full analysis →added 9/23/2026
  • US5729534
    0 cases1/8 sections

    Patent Overview: US5729534A Title: Dynamic allocation of radio capacity in a TDMA system Assignee: Original assignee Nokia Mobile Phones Ltd.; current assignee listed as Nokia Technologies Oy. Key dates: Priority date 1995-01-09; filing…

    View full analysis →added 9/21/2026
  • US5729571
    0 cases1/8 sections

    Patent Overview — US 5,729,571 A Title: Non-coherent digital receiver of a spread spectrum communication system Assignee/Inventor: Original assignee Samsung Electronics Co., Ltd. (a Corp. of Korea); inventors Jong-Hyeon Park and Je-woo…

    View full analysis →added 9/23/2026
  • US5734646
    0 cases1/8 sections

    Patent Overview — US5734646A Title: Code division multiple access system providing load and interference based demand assignment service to users. Patent number / application: US5734646A; application US08/539,476. Inventors: Chih-Lin I and…

    View full analysis →added 9/21/2026
  • US5737403
    0 cases1/8 sections

    Patent Overview: US 5,737,403 Title: Interaction of routing features in a telephone system Patent number: US 5,737,403 A Inventor: Pamela Zave Original/current assignee: AT&T Inc. (originally assigned to AT&T CORP.) Application number: US…

    View full analysis →added 9/23/2026
  • US5737501
    0 cases1/8 sections

    Patent Overview: US 5,737,501 A — "Printer Control Unit and Method" Bibliographic data (from supplied text): Inventor Kiyohiro Tsunekawa; original assignee Canon Inc. (Canon Kabushiki Kaisha); application US 08/677,108; filed 1996-07-09…

    View full analysis →added 9/24/2026
  • US5739639
    0 cases1/8 sections

    Patent Overview — US 5,739,639 A Title: Method and apparatus for operating LED array and charging battery for emergency LED operation including DC boost circuit allowing series connection of LED array and battery Assignee/Original…

    View full analysis →added 9/23/2026
  • US5741495
    0 cases1/8 sections

    Patent Overview — US 5,741,495 A Title: Glucan drug delivery system and adjuvant Assignee/Applicant of record: Alpha Beta Technology Inc (original assignee); current assignee listed as Alpha Beta Technology Inc / Biopolymer Engineering…

    View full analysis →added 9/21/2026
  • US5742845
    0 cases1/8 sections

    Patent Overview — US5742845A Title: System for extending present open network communication protocols to communicate with non-standard I/O devices directly coupled to an open network. Patent number / application: US5742845A; application…

    View full analysis →added 9/23/2026
  • US5745066
    0 cases1/8 sections

    Patent Overview — US5745066A Title: AD converter and magnetic recording/regenerating apparatus using thereof Source: https://patents.google.com/patent/US5745066/en Bibliographic data (as listed): Application number US08/712,558; filed…

    View full analysis →added 9/23/2026
  • US5745480
    0 cases1/8 sections

    Patent Overview: US5745480A — Multi-rate wireless communications system Source: https://patents.google.com/patent/US5745480/en (excerpted fetch, 2026-09-23) Bibliographic facts (as supplied): Application US08/681,191, filed 1996-07-22…

    View full analysis →added 9/23/2026
  • US5745727
    0 cases1/8 sections

    Patent Overview — US5745727A ("Linked caches memory for storing units of information") Bibliographic data (from the supplied record). U.S. Patent 5,745,727 A; application US08/843,315, filed 1997-04-15; granted and published 1998-04-28…

    View full analysis →added 9/23/2026
  • US5749646
    0 cases1/8 sections

    Patent Overview: US5749646A — "Special Effect Lamps" Source: https://patents.google.com/patent/US5749646/en (fetched 2026-09-23) Bibliographic data (from supplied text): - Title: Special effect lamps - Patent number: US5749646A -…

    View full analysis →added 9/23/2026
  • US5751715
    0 cases1/8 sections

    US 5,751,715 A — Patent Overview Title: Accelerator fiber channel hub and protocol Patent number: US 5,751,715 A Application number: US 08/695,290 Inventors: Kurt Chan; Alistair D. Black Original assignee: Gadzoox Microsystems Inc. Current…

    View full analysis →added 9/23/2026
  • US5751971
    0 cases1/8 sections

    Patent Overview: US5751971A Title: Internet Protocol (IP) Work Group Routing Patent number: US5751971A Application number: US08/501,324 Inventors: Kurt A. Dobbins; David L. Cullerot; Stephen H. Negus; William T. Haggerty Original assignee…

    View full analysis →added 9/23/2026
  • US5754655
    0 cases1/8 sections

    Patent Overview — US 5,754,655 A Title: System for remote purchase payment and remote bill payment transactions Patent number / application: US 5,754,655 A; application US 08/891,440 Inventors: Thomas S. Hughes; Gustavo Molina Assignee…

    View full analysis →added 9/24/2026
  • US5762496
    0 cases1/8 sections

    Patent Overview — US 5,762,496 A Title: Disposable dental saliva ejector Patent number: US 5,762,496 A Application number: US 08/520,956 Inventors: Christer Albertsson, Matts Folko, Bengt Mattsson Original/current assignees (as listed)…

    View full analysis →added 9/23/2026
  • US5765152
    0 cases1/8 sections

    Patent Overview — US5765152A Title: System and method for managing copyrighted electronic media Inventor: John S. Erickson Original Assignee: Dartmouth College (later listed assignees include Digimarc Corp; a National Science Foundation…

    View full analysis →added 9/23/2026
  • US5765743
    0 cases1/8 sections

    Patent Overview — US 5,765,743 A Title: Outdoor installation type cabinet Assignee: Fujitsu Ltd (original assignee, per the supplied text) Inventor(s): Jun Sakiura; Yasushi Kojima; Naoya Yamazaki; Kazuhiro Iino; Motoko Nakamura Prior art…

    View full analysis →added 9/23/2026