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)

US5473396
0 cases1/8 sections
Patent Overview — US 5,473,396 A Title: Display apparatus and method of making the same Assignee: Original assignee Matsushita Electric Industrial Co., Ltd. (current assignee listed as Panasonic Holdings Corp). Inventors: Michio Okajima…
View full analysis →added 9/23/2026
US5473607
0 cases1/8 sections
Patent Overview — US5473607A Title: "Packet filtering for data networks" Patent number / application: US5473607A (application US08/103,659) Inventors: Richard J. Hausman; Lazar Birenbaum Original assignee: Grand Junction Networks Inc…
View full analysis →added 9/23/2026
US5475507
0 cases1/8 sections
Patent Overview: US5475507 Title: Color image processing method and apparatus for same, which automatically detects a contour of an object in an image Patent number: US5475507A Application number: US08/134,826 Inventors: Shoji Suzuki…
View full analysis →added 9/17/2026
US5475539
0 cases1/8 sections
Patent Overview: US5475539A — "Image data recording system including memory card" Source: https://patents.google.com/patent/US5475539/en Bibliographic data (as listed): Assignee — Casio Computer Co Ltd. Inventor — Masaharu Orii. Priority…
View full analysis →added 9/23/2026
US5478668
0 cases1/8 sections
Patent Overview — US5478668A Title: Rechargeable lithium battery construction Patent number: US5478668A Application number: US08/241,255 Inventors: Antoni S. Gozdz, Caroline N. Schmutz, Jean-Marie Tarascon, Paul C. Warren Original…
View full analysis →added 9/20/2026
US5479206
0 cases1/8 sections
Patent Overview — US5479206A Title: Imaging system, electronic camera, computer system for controlling said electronic camera, and methods of controlling same Patent number: US5479206A (application US08/012,463) Assignee/owner on record…
View full analysis →added 9/17/2026
US5479645
0 cases1/8 sections
Patent Overview — US 5,479,645 A Title: Portable computer capable of switching CPU clocks Assignee: Toshiba Corp (original assignee; assignment recorded to Kabushiki Kaisha Toshiba, assignors Makoto Sakai and Makoto Arai) Key dates…
View full analysis →added 9/23/2026
US5483173
0 cases1/8 sections
Patent Overview — US 5,483,173 A Title: Current measuring structure for testing integrated circuits Assignee/Original Assignee: STMicroelectronics SRL; originally SGS Thomson Microelectronics SRL Inventor: Franco Pellegrini Dates: Priority…
View full analysis →added 9/23/2026
US5483524
0 cases1/8 sections
Patent Overview: US 5,483,524 Title: Method for transmitting data packets via a circuit-switched channel Patent number / application: US 5,483,524 A; Application US08/239,489 Inventors: Valy Lev, Rod Averbuch, Israel A. Cimet Original…
View full analysis →added 9/23/2026
US5485474
0 cases1/8 sections
Patent Overview — US5485474A Title: Scheme for information dispersal and reconstruction Assignee: Harvard University (current and original assignee, per the listing) Key dates: - Prior art date / priority date: 1988-02-25 (priority stated…
View full analysis →added 9/23/2026
US5485634
0 cases1/8 sections
Patent Overview — US5485634A Title: Method and system for the dynamic selection, allocation and arbitration of control between devices within a region. Patent number / application: US5485634A; application US08/166,478. Assignee: Xerox Corp…
View full analysis →added 9/24/2026
US5489773
0 cases1/8 sections
Patent Overview — US 5,489,773 A Title: Integrated portable device for point of sale transactions Assignee/Original Assignee: Khyber Technologies Corp (per the supplied record; assigned via assignment from inventor Rajendra Kumar, recorded…
View full analysis →added 9/24/2026
US5490136
0 cases1/8 sections
US5490136A — Patent Overview Title: Method of controlling transmission on a same radio channel of variable-rate information streams in radio communication systems Patent number: US5490136A (application US08/241,207) Inventors: Daniele…
View full analysis →added 9/21/2026
US5493490
0 cases1/8 sections
Patent Overview: US5493490A Title: Electronic proposal preparation system for selling vehicles Patent number: US5493490A Application number: US07/878,602 Inventor: Jerome D. Johnson Original assignee: Clear With Computers Inc Current…
View full analysis →added 9/23/2026
US5494592
0 cases1/8 sections
Patent Overview — US5494592A Title: Apheresis apparatus and method Patent number: US5494592A Application number: US08/372,890 Inventor(s): Allen Latham, Jr.; Glen E. Jorgensen; Theodoor H. S. Sibinga; Joseph R. Plante; Tracey E. Knapp…
View full analysis →added 9/23/2026
US5499298
0 cases1/8 sections
Patent Overview: US5499298A Title: Controlled dissemination of digital information Patent number: US5499298A. Application number: US08/210,174. Inventors: Arcot D. Narasimhalu, Weiguo Wang, Mohan S. Kankanhalli. Assignee: National…
View full analysis →added 9/23/2026
US5504511
0 cases1/8 sections
Patent Overview — US 5,504,511 ("Ink container") Bibliographic data (as supplied): Title, "Ink container." Inventors: Kazuhiro Nakajima and Keiichiro Tsukuda. Original and current assignee: Canon Inc. / Canon Kabushiki Kaisha. Priority…
View full analysis →added 9/23/2026
US5504745
0 cases1/8 sections
Patent Overview — US 5,504,745 Title: Switching cell transmission device employing dual gate FET's as one-way RF switching element Patent Number: US5504745A Application Number: US08/251,942 Inventors: Felix A. Petz; Wolfgang Greiner…
View full analysis →added 9/23/2026
US5510841
0 cases1/8 sections
Patent Overview — US5510841A Title: Encoding apparatus in which flat subblocks are identified in blocks of a motion signal prior to coding the blocks and complementary decoding apparatus Patent number: US5510841A | Application number…
View full analysis →added 9/23/2026
US5511098
0 cases1/8 sections
US5511098A — Digital methods and apparatus reverse link signal detection and recovery in a mobile data base station - Inventor: Steven H. Gardner - Original assignee: Pacific Communication Sciences, Inc. (later records list ADC…
View full analysis →added 9/23/2026