The catalog
Patent invalidity dossiers.
7,163 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
I'll run targeted searches for this patent number and its litigation history. Now let me check specifically for litigation / CAFC activity involving this patent. Let me check for any 2026 activity and confirm the prosecution/priority…
View full analysis →added 9/28/2026I'll search for authoritative information on this patent number. Let me dig deeper into litigation/docket records and confirm the bibliographic details. Let me confirm the independent claim language and the litigation history. US Patent…
View full analysis →added 9/20/2026I'll search for this specific patent number across patent and litigation sources. Good — I have claim text from the RPX litigation database. Let me check for litigation/docket activity and verify the claim set. Let me check the litigation…
View full analysis →added 9/28/2026I'll search for authoritative information on this specific patent number and any 2026 CAFC docket activity. Let me run a few more targeted searches to check for any 2026 litigation or CAFC activity and to confirm bibliographic details. US…
View full analysis →added 9/27/2026I'll verify the details against live sources before summarizing. Let me check for litigation and any CAFC docket activity involving this specific patent. Verification note I searched the web (Google Patents, Espacenet, Justia/FPO…
View full analysis →added 9/24/2026I'll verify the current status of US 5634051 against live sources before summarizing. Let me check the recorded litigation history and any 2026 activity specifically. Verification summary — US 5,634,051 I checked live sources (Google…
View full analysis →added 10/1/2026I'll search for this specific patent number to verify details and check for any litigation. US 5,643,575 — Verification and Summary Scope of what I could verify. I searched Google Patents (which mirrors USPTO bibliographic data), the full…
View full analysis →added 9/24/2026I'll search for authoritative information on this specific patent number. Let me run a couple more targeted searches on litigation and any 2026 appellate activity. Patent Analysis Report — US 5,646,390 Scope note: I searched for the exact…
View full analysis →added 9/24/2026I'll verify the patent against live sources before summarizing. US 5,658,759 — verified summary Caveat on scope of verification: the details below are drawn from the patent's own full text plus live web results (Google Patents…
View full analysis →added 9/27/2026I'll search for information on this specific patent number, including any 2026 litigation activity. Let me look for claim text and any 2026 litigation activity. Let me check for any recent (2025–2026) litigation or docket activity, and…
View full analysis →added 9/30/2026I'll search for authoritative information on US patent 5710557, including any CAFC 2026 docket activity. Let me search specifically for litigation and any 2026 Federal Circuit activity. Let me run a few more targeted searches for any 2026…
View full analysis →added 9/24/2026I'll verify the CAFC 2026 docket status and try to pin down the issued claims, which the authoritative text above omits. No CAFC docket surfaced. Let me try to retrieve the issued claim text from a source that reproduces it. Let me run one…
View full analysis →added 9/28/2026I'll search for authoritative information on US 5745681, including any litigation or CAFC docket activity. Let me search for the specific litigation and any Federal Circuit activity involving this patent. Summary: US Patent 5,745,681…
View full analysis →added 9/24/2026Here is a concise summary of US Patent 5,758,328: Title: Computerized quotation system and method Current Assignee: SOURCE SEARCH TECHNOLOGIES LLC Original Assignee: Individual Inventor: Joseph Giovannoli Filing Date: 1996-02-22 Issue…
View full analysis →added 7/3/2026I'll verify the litigation/docket angle and any recent activity, then summarize from the authoritative patent text. US Patent 5,760,916 — Verification and Summary Search-scope note first: I searched for the exact number "5760916" /…
View full analysis →added 9/29/2026I'll verify the patent details against live sources and check for any current litigation. Let me check for the specific litigation reference in the patent record and any 2026 appellate activity. The patent's own record shows no 2026…
View full analysis →added 9/27/2026I'll verify this patent against live sources before summarizing. Let me run targeted searches. Let me check the CAFC dockets and the specific district court case tied to this patent. US Patent 5,802,068 — Verification Summary I…
View full analysis →added 9/28/2026I'll search for information on US Patent 5,807,522 and any CAFC 2026 docket activity. Both searches returned empty results. Let me try broader and alternate queries. Let me search specifically for litigation and CAFC docket activity…
View full analysis →added 9/8/2026I'll run targeted searches for US 5,809,623, including any 2026 CAFC activity. The first pass confirms the patent record but returned nothing on litigation. Let me probe the court docket angle and the assignee history more specifically. No…
View full analysis →added 9/30/2026I'll search for authoritative information on patent 5809638, including any litigation activity. Let me verify litigation status and the patent's family/current owner with additional targeted searches. US Patent 5,809,638 — Verification…
View full analysis →added 9/30/2026