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)

US3371085
0 cases1/8 sections
Patent Overview — US 3,371,085 Title: 5-aryl-3H-1,4-benzodiazepin-2(1H)-ones Patent number: US 3,371,085 A Assignee/Applicant: F. Hoffmann La Roche AG (original assignee). Application filed by F. Hoffmann La Roche AG; inventors Earl Reeder…
View full analysis →added 9/23/2026
US3374225
0 cases1/8 sections
Patent Overview: US 3,374,225 — Aminobenzodiazepine Compounds and Methods Bibliographic data (from supplied text). Patent number US 3,374,225; application number US268553A. Inventors: Reeder Earl, Stempel Arthur, and Sternbach Leo Henryk…
View full analysis →added 9/23/2026
US3384155
0 cases1/8 sections
Patent Overview — US 3,384,155 Title: Air conditioning system Assignee: Borg Warner Corp (original and current assignee as listed) Inventor: Alwin B. Newton Key dates: Priority/filing — 1966-01-24; granted/publication — 1968-05-21…
View full analysis →added 9/23/2026
US3389827
0 cases1/8 sections
Patent Overview: US3389827A Title: Easy-open container and sealing tape Patent number: US3389827A Inventors: Joseph F Abere; Wilfred R Brochman Original assignee: Minnesota Mining and Manufacturing Co Current assignee (per listing): 3M Co…
View full analysis →added 9/23/2026
US3416730
0 cases1/8 sections
Patent Overview — US 3,416,730 Title: Apparatus for Providing Multiple Liquid Jets Inventor: Charles C. Perry Assignee: None stated — listed as "Individual" (original assignee also Individual) Application No.: US 664,554, filed Aug. 30…
View full analysis →added 9/17/2026
US3461103
0 cases1/8 sections
US3461103A — Concise Patent Overview Title: Water dispersible polyurethane plastics prepared from cyclic compounds Patent number: US3461103A Assignee (original and current, as listed): Bayer AG Inventors: Wolfgang Keberle, Dieter…
View full analysis →added 9/23/2026
US3463103
0 cases1/8 sections
Patent Overview — US 3,463,103 Title: Inactive position centering mechanism for sewing machines. Source: https://patents.google.com/patent/US3463103/en Bibliographic data (per supplied text): Patent number US3463103A; application number…
View full analysis →added 9/23/2026
US347710
0 cases1/8 sections
Patent Overview — US 347,710 Title: Automatic Apparatus for Accumulating and Utilizing Power Patentee: James Houlehan, of Toledo, Lucas County, Ohio. Assignee: The Railway Water Hoist Company, of Chicago, Illinois. Dates: Application filed…
View full analysis →added 9/23/2026
US3536809
0 cases1/8 sections
Patent Overview — US 3,536,809 Title: Medication method Inventor: Norman Applezweig (New York, N.Y.) Assignee: Alza Corporation, Palo Alto, Calif. (original assignee; Google's current-assignee data is expressly labeled an assumption)…
View full analysis →added 9/24/2026
US3543014
0 cases1/8 sections
Patent Overview: US 3,543,014 — "Buried Panel-Illuminating Installation" Bibliographic data (from source): Patent number US3543014A; application number US726824A; inventor Ronald K. Bustad; original and current assignee Farwest Electronics…
View full analysis →added 9/23/2026
US3571585
0 cases1/8 sections
Patent Overview — US 3571585 A Title: Panel and Edge Lighting Assembly Patent number: US 3571585 A Application number: US774938A Inventor: Louis Clarence Schermerhorn Original assignee: Coastal Dynamics Corp Priority/filing date…
View full analysis →added 9/23/2026
US3630200
0 cases1/8 sections
Patent Overview — US 3,630,200 ("Ocular insert") Bibliographic data (as supplied): US Patent 3,630,200; application US831481A; inventor Takeru Higuchi; original assignee and current assignee Alza Corp; priority/filing date 1969-06-09…
View full analysis →added 9/23/2026
US3648020
0 cases1/8 sections
Patent Overview — US 3648020A Title: Automatic deposit-receiving and cash-dispensing system Assignee: Original assignee Omron Tateisi Electronics Co.; current assignee listed as Omron Corp. Inventors: Kazuma Tateisi, Yukio Mizuta, Shizuya…
View full analysis →added 9/23/2026
US3660675
0 cases1/8 sections
Patent Overview — US 3,660,675 Title: "Transmission line series termination network for interconnecting high speed logic circuits" Assignee: Honeywell Inc. (original assignee). Inventor: John R. Andrews Jr. Dates: Priority/filing date…
View full analysis →added 9/21/2026
US3674840
0 cases1/8 sections
Patent Overview — US 3,674,840 A Title: "1-(para-alkoxyalkoxy-phenyl)-2-hydroxy-3-alkylaminopropanes and the salts thereof" Source: https://patents.google.com/patent/US3674840/en Key formal details (from the supplied text): - Publication…
View full analysis →added 9/21/2026
US3675657
0 cases1/8 sections
Patent Overview — US 3,675,657 A Title: Tourniquet Inventor: Oscar Gauthier (Ville Brossard, Province of Quebec, Canada) Assignee: Clebel Inc., L'Ange-Gardien, Co. Rouville, Quebec, Canada Application No.: US 841,445 Filing / Priority…
View full analysis →added 9/23/2026
US370363
0 cases1/8 sections
Patent Overview: US 370,363 — Cash Indicator and Register Title: Cash Indicator and Register Patentee: Jerome J. Webster, of Newport, Vermont Assignee: Boston Cash Indicator and Recorder Company, of Bangor, Maine Application filed: October…
View full analysis →added 9/24/2026
US3722371
0 cases1/8 sections
Patent Overview — US 3722371 A Title: High Ratio Linkage Mechanism Assignee: Pneumo Dynamics Corp (original assignee; also listed as current assignee) Dates: Priority/filing date 1970-03-12; publication/grant date 1973-03-27; anticipated…
View full analysis →added 9/23/2026
US3747859
0 cases1/8 sections
Patent Overview — US 3,747,859 Title: Torch for thermochemical processing of work pieces Inventors: Heinz Gabel; Gerhardt Lange (Frankfurt/Main, Germany) Assignee: Messer Griesheim GmbH (Frankfurt/Main, Germany) Priority: 1970-09-19…
View full analysis →added 9/21/2026
US3752974
0 cases1/8 sections
Patent Overview — US 3752974 A Title: Uniform illumination with edge lighting Patent number: US 3752974 A (application US00207218A; also referenced as US3752974D A / US3752974DA) Inventors: M. Baker; L. Myers Assignee: Coastal Dynamics…
View full analysis →added 9/23/2026