The catalog

Patent invalidity dossiers.

7,247 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)

US5406945
0 cases1/8 sections
Patent Overview — US 5,406,945 A Title: Biomedical electrode having a secured one-piece conductive terminal Patent number / application: US 5,406,945 A (application US08/066,716) Original assignee: NDM Acquisition Corp; current assignee…
View full analysis →added 9/23/2026
US5408388
0 cases1/8 sections
Patent Overview — US 5408388 A Title: Planar illuminating device Assignee/Original Assignee: Stanley Electric Co., Ltd. Inventors: Uruo Kobayashi, Yoji Oki, Nobuo Matsui, Yoshinori Go Key dates (as listed): Priority date 1992-01-24; filing…
View full analysis →added 9/23/2026
US5410598
0 cases1/8 sections
Patent Overview — US5410598A Title: Database usage metering and protection system and method Patent number: US5410598A Application number: US08/311,311 Inventor: Victor H. Shear Original/current assignee (as listed): Electronic Publishing…
View full analysis →added 9/23/2026
US5412653
0 cases1/8 sections
Patent Overview: US5412653A — Dynamic Switch Cascading System Title: Dynamic switch cascading system Patent number: US5412653A (application US08/138,288) Assignee: International Business Machines Corporation (original and current assignee…
View full analysis →added 9/23/2026
US5416842
0 cases1/8 sections
US5416842A — Method and apparatus for key-management scheme for use with internet protocols at site firewalls - Assignee: Sun Microsystems, Inc. (original assignee); inventor Ashar Aziz. - Filing/priority date: 1994-06-10 (application…
View full analysis →added 9/21/2026
US5417354
0 cases1/8 sections
Patent Overview — US 5,417,354 A Title: Universal carrier for fully rigged fishing poles Source: https://patents.google.com/patent/US5417354/en Patent number: US5417354A (application US08/019,156) Inventor: James C. Jones Assignee: None…
View full analysis →added 9/24/2026
US5418354
0 cases1/8 sections
Patent Overview — US 5,418,354 A ("Self Service Cart System") Bibliographic data (from source): US Patent 5,418,354 A; application US08/109,421; inventors Leonard W. Halling and Dale B. Halling; original assignee listed as Individual…
View full analysis →added 9/24/2026
US5418583
0 cases1/8 sections
Patent Overview: US5418583A Title: Optical illumination system and projection display apparatus using the same Patent number: US5418583A Application number: US08/039,770 Inventor: Yoshihiro Masumoto Original assignee: Matsushita Electric…
View full analysis →added 9/23/2026
US5418780
0 cases1/8 sections
Patent Overview — US 5,418,780 A Title: Routing logic means for a communication switching element Patent number: US 5,418,780 A (application US 07/668,582) Inventor: Michel A. R. Henrion Original assignee: Alcatel N.V.; current assignee…
View full analysis →added 9/23/2026
US5419455
0 cases1/8 sections
Patent Overview: US 5,419,455 — "Plate for Use with Stemware" Patent number: US 5,419,455 (application US08/239,721) Title: Plate for use with stemware Inventor: Kathleen Russeau Original assignee / current assignee: Individual…
View full analysis →added 9/23/2026
US5420606
0 cases1/8 sections
Patent Overview — US5420606A Title: Instant electronic coupon verification system Patent number: US5420606A | Application number: US08/123,192 Inventors: Paul G. Begum; Mark A. Geiger Assignee of record (as supplied): Original assignee…
View full analysis →added 9/23/2026
US5420854
0 cases1/8 sections
Patent Overview — US 5,420,854 Title: Digital interface system Patent number: US5420854A Assignee: Hitachi Ltd (original and current assignee per the source) Inventor: Masashi Hiraiwa Priority date: 1990-06-18 Application: US08/153,107…
View full analysis →added 9/23/2026
US5424524
0 cases1/8 sections
Patent Overview — US5424524A Title: Personal scanner/computer for displaying shopping lists and scanning barcodes to aid shoppers Patent number: US5424524A Application number: US08/082,257 Inventors: Jonathan P. Ruppert; Ronald C. Fish…
View full analysis →added 9/23/2026
US5424942
0 cases1/8 sections
Summary of U.S. Patent No. 5,424,942 (US5424942A) Important search caveat (per your instruction not to auto-correct or conflate similar numbers): My searches of CAFC 2026 dockets returned no appeal involving patent 5,424,942. The only CAFC…
View full analysis →added 8/27/2026
US5432526
0 cases1/8 sections
Patent Overview — US5432526A Title: Liquid crystal display having conductive cooling Patent number: US5432526A Application number: US07/515,881 Inventor: Gilbert P. Hyatt Original assignee / current assignee (as listed): Individual Filing…
View full analysis →added 9/23/2026
US5432907
0 cases1/8 sections
Patent Overview — US 5,432,907 Title: Network hub with integrated bridge Patent number: US 5,432,907 A Application number: US 07/881,931 Inventors: Jose J. Picazo, Jr. and William E. Steels (one assignment record lists "William E. Steele"…
View full analysis →added 9/23/2026
US5434394
0 cases1/8 sections
Patent Overview — US 5,434,894 Title: Automated order and delivery system Assignee: Tandy Corp (original and current assignee, per the source listing) Inventors: John V. Roach; Richard Hollander Key dates: Priority date 1992-09-10…
View full analysis →added 9/24/2026
US5438484
0 cases1/8 sections
Patent Overview — US 5,438,484 Title: Surface lighting device and a display having such a lighting device Patent number: US 5,438,484 A (application US 07/984,836) Assignee: Canon KABUSHIKI KAISHA (Canon Inc.), per the assignment recorded…
View full analysis →added 9/23/2026
US5442390
0 cases1/8 sections
Summary of U.S. Patent No. 5,442,390 (US5442390A) Search note: I searched for the specific patent number 5442390 (published as US5442390A; also written 5,442,390). I did not find any CAFC 2026 docket or pending Federal Circuit appeal…
View full analysis →added 8/27/2026
US5442625
0 cases1/8 sections
Patent Overview: US5442625A Title: Code division multiple access system providing variable data rate access to a user Patent number: US5442625A (application US08/242,471) Inventors: Richard D. Gitlin; Chih-Lin I Assignee: Original assignee…
View full analysis →added 9/21/2026