Wednesday, June 10, 2026

Patent intelligence · US

US 6617331

Purine inhibitors of protein kinases, G proteins and polymerases

expired A61KA61K31/52A61PA61P25/28
Status expired
Linked drugs 2
Pipeline programs 6
Years to expiry 0
Applicant portfolio 8,292
Patent details — US 6617331

Quick answer

US 6617331 (Purine inhibitors of protein kinases, G proteins and polymerases) is held by The Regents of the University of California. Status: expired. Granted Sep 9, 2003. Expires Sep 4, 2023 (0 years remaining) — relevant for patent-cliff and LOE planning.

Key facts

Grant date
Expiration
Claims
5
CPC classes
A61K, A61K31/52, A61P, A61P25/28, A61P35/00

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Frequently asked questions

What is US patent 6617331?

US 6617331 (Purine inhibitors of protein kinases, G proteins and polymerases) is held by The Regents of the University of California. Status: expired. Granted Sep 9, 2003. Expires Sep 4, 2023 (0 years remaining) — relevant for patent-cliff and LOE planning.

Who owns US 6617331?

The Regents of the University of California is listed as the applicant in USPTO PatentsView records indexed by NovaPharmaNews. We track 8,292 pharmaceutical patents for this assignee.

When does US 6617331 expire?

Our index shows an expiration date of Sep 4, 2023 (0 years from today). Confirm material dates against USPTO, FDA Orange Book, or qualified counsel before contractual decisions.