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 patent
Drop a US patent number — we’ll verify it on Google Patents and generate the full invalidity dossier.
By industry
- US51793600 cases1/8 sections
Patent Overview: US 5,179,360 Title: Transmitting/receiving apparatus switchable between digital and analog modulation modes Patent number: US 5,179,360 A Inventor: Mitsuhiro Suzuki Assignee: Sony Corporation Priority date: 1991-03-20…
View full analysis →added 9/23/2026 - US51862810 cases1/8 sections
Patent Overview — US5186281A Title: Method for retail checkout Patent number: US5186281A Application number: US07/712,835 Inventor: Alfred D. Jenkins Original assignee: NCR Corp; current assignee listed as NCR Voyix Corp Priority/filing…
View full analysis →added 9/23/2026 - US51903700 cases1/8 sections
Patent Overview — US5190370A Title: High aspect ratio lighting element Patent number: US5190370A Application number: US07/748,030 Filing / priority date: 1991-08-21 (both listed as the same date) Publication (grant) date: 1993-03-02…
View full analysis →added 9/23/2026 - US51929870 cases1/8 sections
Patent Overview — US 5,192,987 Title: High electron mobility transistor with GaN/AlₓGa₁₋ₓN heterojunctions Patent number: US5192987A (application US07/701,792) Assignee: APA Optics Inc. (original assignee). The source also lists current…
View full analysis →added 9/21/2026 - US52074930 cases1/8 sections
Patent Overview — US 5,207,493 Title: Edge light panel device Patent number: US5207493A Application number: US07/725,661 Inventors: Shinzo Murase; Hirokazu Matsui Assignee: KABUSHIKI KAISHA MEITAKU SHISUTEMU (Meitaku Shisutemu KK) Priority…
View full analysis →added 9/23/2026 - US52150870 cases1/8 sections
Patent Overview — US 5215087 A Title: Biomedical electrode construction Patent number: US 5,215,087 A Application number: US 07/686,049 Inventors: Clifford J. Anderson; Jerome E. Strand Original assignee: Minnesota Mining and Manufacturing…
View full analysis →added 9/23/2026 - US52241200 cases1/8 sections
Patent Overview — US 5,224,120 A Title: "Dynamic capacity allocation CDMA spread spectrum communications" Inventor: Donald L. Schilling Assignee of record in the excerpt: InterDigital Technology Corp. (original assignee); earlier…
View full analysis →added 9/21/2026 - US52254730 cases1/8 sections
Patent Overview: US5225473A — Pressure-Sensitive Adhesives Title: Pressure-sensitive adhesives Patent number: US5225473A Application number: US07/866,207 Inventor: Daniel C. Duan Original assignee: Minnesota Mining and Manufacturing Co…
View full analysis →added 9/23/2026 - US52280740 cases1/8 sections
Patent Overview: US5228074A — Dual Mode Cellular Telephone Apparatus Title: Dual mode cellular telephone apparatus Patent number / application: US5228074A; application US07/684,774 Inventor: Semyon Mizikovsky Assignee (per source)…
View full analysis →added 9/23/2026 - US52362150 cases1/8 sections
Patent Overview — US 5,236,215 A Title: Trailer hitch coupling guide Inventor: Thomas S. Wylie Assignee: Individual (no corporate assignee listed) Application No.: US 07/914,316 Priority/Filing Date: 1992-07-17 Publication (Grant) Date…
View full analysis →added 9/23/2026 - US52367070 cases1/8 sections
Patent Overview: US 5,236,707 — "Stabilization of Human Interferon" Bibliographic data (per supplied text): US Patent 5,236,707; application US07/790,670; inventor William E. Stewart II; original assignee Dallas Biotherapeutics, Inc…
View full analysis →added 9/23/2026 - US52415030 cases1/8 sections
Patent Overview — US 5,241,503 A Title: Dynamic random access memory with improved page-mode performance and method therefor having isolator between memory cells and sense amplifiers. Patent number / application: US 5,241,503 A…
View full analysis →added 9/21/2026 - US52415370 cases1/8 sections
US 5,241,537 — Patent Overview Title: Conventional base station interface architecture for RF trunking multisite switch Patent number: US 5,241,537 A Application number: US 07/709,987 Inventors: Philip C. Gulliford, Charles P. Brame, Wim…
View full analysis →added 9/23/2026 - US52475750 cases1/8 sections
Patent Overview: US 5,247,575 A — "Information Distribution System" Title: Information distribution system Patent number: US 5,247,575 A Application number: US07/874,991 Inventors: Peter J. Sprague; Thomas H. Lipscomb Original assignee…
View full analysis →added 9/23/2026 - US52572570 cases1/8 sections
Patent Overview — US 5257257 A Title: Method of controlling the operation of a packet switched CDMA communication network for controlling the operation of transmitters and receivers. Patent number / application: US5257257A; application…
View full analysis →added 9/21/2026 - US52573870 cases1/8 sections
Patent Overview: US5257387A Title: Computer implemented method and apparatus for dynamic and automatic configuration of a computer system and circuit boards including computer resource allocation conflict resolution. Assignee/Inventor…
View full analysis →added 9/23/2026 - US52609990 cases1/8 sections
Patent Overview — US5260999A Title: Filters in License Management System (source as given). Patent number / application: US5260999A; application US07/946,009, filed 1992-09-15; granted and published 1993-11-09. Inventor / assignees: Robert…
View full analysis →added 9/23/2026 - US52623910 cases1/8 sections
Patent Overview: US5262391A Title: Oxide superconductor and process for preparation thereof Patent number: US5262391A Application number: US07/635,628 Inventor(s): Mitsuru Morita; Katsuyoshi Miyamoto; Kiyoshi Sawano; Shouichi Matsuda…
View full analysis →added 9/23/2026 - US52648220 cases1/8 sections
Patent Overview — US 5264822 A Title: System for transmitting audio advertising messages to shopping carts moving through spatially defined transmission zones arranged in a store. Patent number / application: US 5264822 A; application…
View full analysis →added 9/24/2026 - US52684610 cases1/8 sections
US5268461A — Alkylated oligosaccharides and acetyl derivatives of the same Bibliographic data (from the supplied source): Application US07/834,305; priority date 1990‑06‑27; filing date 1991‑06‑27; granted/publication date 1993‑12‑07…
View full analysis →added 9/23/2026