The catalog

Patent invalidity dossiers.

6,487 patents in the database, sorted by number of on-file litigation cases. Of these, 2,477 have at least one tracked case across 5,367 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)(1031)Medical (M)(506)High-Tech (T)(500)Wireless Technologies(398)Semiconductor (T)(262)Industrial Manufacturing (IM)(192)Automotive (A)(182)Media & Broadcasting (T)(142)Energy (E)(106)Biotechnology(104)Optical Technology(92)Financial Technology (FT)(91)Sporting Goods (S)(71)Other (O)(64)Audio Technology(47)Lighting (L)(45)Gaming (G)(32)Consumer Durables(31)Home Appliance (HA)(29)Firearms (F)(27)Food (FD)(24)Railroad(22)Agriculture (AG)(21)Footwear(19)Optical Communication(16)Audience Measurement(15)Home Security(14)Plumbing(14)Baby Products(10)Tech (T)(4)Telecommunications(3)Aerospace(2)Telecommunications (TC)(2)Toys(2)Aerospace (Ae)(1)Aerospace (AS)(1)Aviation(1)Building Materials(1)Chemical Sensing(1)Construction (C)(1)Cosmetics (C)(1)Data Communication(1)Electrical Components(1)Environmental Monitoring (EM)(1)Fire Safety(1)Fire Safety (FS)(1)Furniture (F)(1)High-Tech(1)Logistics (L)(1)Logistics & Shipping(1)Musical Instruments (MI)(1)Office Equipment(1)Pet Products(1)Printing (P)(1)Printing Technology(1)Printing Technology (P)(1)Software Technology (T)(1)Telecommunications (T)(1)Textiles(1)Tobacco (TB)(1)Vaping (V)(1)Video Technology(1)Water Treatment(1)