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)

US6219706
0 cases1/8 sections
Patent Overview — US 6219706 B1 Title: Access control for networks Patent number: US 6219706 B1 Application number: US09/174,200 Inventors: Serene Fan; Steve Truong Assignee: Cisco Technology, Inc. (original assignee; listed current…
View full analysis →added 9/23/2026
US6219786
0 cases1/8 sections
Patent Overview: US 6,219,786 B1 Title: Method and system for monitoring and controlling network access Patent number: US 6,219,786 B1 Application number: US09/150,264 Inventors: Mark Cunningham; Andrew Trevarrow Original assignee…
View full analysis →added 9/23/2026
US6223029
0 cases1/8 sections
Patent Overview — US 6,223,029 B1 Title: Combined mobile telephone and remote control terminal Patent number: US 6,223,029 B1 Application number: US 08/845,938 Inventors: Anna-Karin Stenman, Mats Pettersson, Torbjörn Gärdenfors…
View full analysis →added 9/21/2026
US6226752
0 cases1/8 sections
Patent Overview: US 6,226,752 B1 Title: Method and apparatus for authenticating users Patent Number: US 6,226,752 B1 Application Number: US09/309,341 Inventors: Abhay Gupta, Chris Ferris, Alejandro Abdelnur Original Assignee: Sun…
View full analysis →added 9/23/2026
US6229059
0 cases1/8 sections
Patent Overview — US 6229059 B1 Title: Process for the production of 1,2-dichloroethane Assignee / Inventor: Original assignee Krupp Uhde GmbH; current assignee listed as Vinnolit Technologie GmbH and Co KG. Inventor: Joachim Motz. Key…
View full analysis →added 9/24/2026
US6229795
0 cases1/8 sections
Patent Overview — US 6229795 B1 Title: System for allocating resources in a communication system Patent number: US 6229795 B1 Application number: US09/229,432 Inventors: Rajesh Pankaj; Nagabhushana T. Sindhushayana Original/current…
View full analysis →added 9/21/2026
US6230179
0 cases1/8 sections
Patent Overview — US6230179B1 Title: Finite field multiplier with intrinsic modular reduction Patent number / application: US6230179B1; application US08/997,960, filed 1997-12-24. Dates: Prior-art date 1997-04-18; filing date 1997-12-24…
View full analysis →added 9/21/2026
US6233618
0 cases1/8 sections
Patent Overview: US 6233618 B1 — "Access Control of Networked Data" Title: Access control of networked data Patent number: US 6233618 B1 Application number: US09/052,236 Inventor: Steven Shannon Original/current assignee (as listed)…
View full analysis →added 9/21/2026
US6235224
0 cases1/8 sections
Patent Overview — US 6,235,224 B1 Title: Process for preparing microparticles through phase inversion phenomena Patent number: US 6,235,224 B1 Application number: US09/442,723 Filing date: 1999-11-18 Publication/grant date: 2001-05-22…
View full analysis →added 9/23/2026
US6243026
0 cases1/8 sections
Patent Overview: US 6,243,026 B1 Title: Automatic determination of traffic signal preemption using GPS, apparatus and method Source: https://patents.google.com/patent/US6243026/en Bibliographic data (as listed): - Patent number: US…
View full analysis →added 9/23/2026
US6246179
0 cases1/8 sections
Patent Overview — US 6,246,179 B1 Title: "Emissive element and display device using such element" Assignee: Sanyo Electric Co., Ltd. (original assignee; listed current assignee also Sanyo Electric Co., Ltd.) Inventor: Tsutomu Yamada Key…
View full analysis →added 9/23/2026
US6251295
0 cases1/8 sections
Patent Overview — US 6,251,295 B1 Title: Method for recirculation washing of blood cells Inventor: Craig L. Johnson Assignee: Nexell Therapeutics Inc (original and listed current assignee) Application No.: US 09/004,344 Priority/filing…
View full analysis →added 9/20/2026
US6252617
0 cases1/8 sections
Patent Overview — US 6,252,617 B1 Title: Ink jet recording method Patent number: US6252617B1 Application number: US08/067,850 Inventor(s): Kenji Hasegawa; Koichi Toma; Isao Kimura; Atsushi Shiozaki Original assignee / current assignee (as…
View full analysis →added 9/23/2026
US6267670
0 cases1/8 sections
Patent Overview — US 6267670 B1 Title: System and method for performing lottery ticket transactions utilizing point-of-sale terminals Patent number: US 6267670 B1 Application number: US08/822,709 Inventors: Jay S. Walker, James A. Jorasch…
View full analysis →added 9/23/2026
US6275470
0 cases1/8 sections
US 6,275,470 B1 — Patent Overview Title: On-demand overlay routing for computer-based communication networks Patent number / application: US 6,275,470 B1; application US09/336,487 Inventor: Livio Ricciulli Original assignee: Digital Island…
View full analysis →added 9/21/2026
US6276113
0 cases1/8 sections
Patent Overview: US6276113B1 — Setup Table for Bottle Handling Machines Title: Setup table for bottle handling machines Patent number: US6276113B1 Inventor: Herbert Bernhard Original assignee: KHS Maschinen und Anlagenbau AG (current…
View full analysis →added 9/17/2026
US6276822
0 cases1/8 sections
Patent Overview — US 6,276,822 B1 Title: Method of replacing a conventional vehicle light bulb with a light-emitting diode array Patent number: US 6,276,822 B1 Application number: US09/239,196 Inventors: Yerchanik Bedrosian; Ara Bedrosian…
View full analysis →added 9/23/2026
US6282575
0 cases1/8 sections
Patent Overview — US 6282575 B1 Title: Routing mechanism for networks with separate upstream and downstream traffic Patent number / application: US 6282575 B1; Application US08/999,679 Assignee: Intel Corp (original assignee); assignment…
View full analysis →added 9/23/2026
US6290670
0 cases1/8 sections
Patent Overview — US 6,290,670 B1 Title: Device for removing pathological centers for use in humans and animals Patent number: US 6,290,670 B1 Application number: US09/420,199 Inventor: Andreas Pein Original assignee: Andreas Pein…
View full analysis →added 9/23/2026
US6292566
0 cases1/8 sections
Patent Overview — US 6,292,566 B1 Title: Telephone and associated method for routing a call Patent number: US 6,292,566 B1 Application number: US09/201,022 Inventors: Bradley S. Reeves; Craig I. Weich; Lee Quintanar Original assignee…
View full analysis →added 9/23/2026