Wednesday, July 8, 2026

Patent intelligence · US

US 6544528

Multi-subtype FIV vaccines

expired A61KA61K2039/515A61K2039/5252A61K2039/545
Status expired
Linked drugs 1
Pipeline programs 6
Years to expiry 0
Applicant portfolio 8,292
Patent details — US 6544528
Jurisdiction
US
Status
expired
Grant date
Apr 8, 2003
Expiration
Apr 3, 2023
Claims
33
CPC classes
A61K, A61K2039/515, A61K2039/5252, A61K2039/545
View on Google Patents ↗

Quick answer

US 6544528 (Multi-subtype FIV vaccines) is held by THE REGENTS OF THE UNIV. OF CALIFORNIA. Status: expired. Granted Apr 8, 2003. Expires Apr 3, 2023 (0 years remaining) — relevant for patent-cliff and LOE planning.

Key facts

Grant date
Expiration
Claims
33
CPC classes
A61K, A61K2039/515, A61K2039/5252, A61K2039/545, A61K2039/57, A61K39/12

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Frequently asked questions

What is US patent 6544528?

US 6544528 (Multi-subtype FIV vaccines) is held by THE REGENTS OF THE UNIV. OF CALIFORNIA. Status: expired. Granted Apr 8, 2003. Expires Apr 3, 2023 (0 years remaining) — relevant for patent-cliff and LOE planning.

Who owns US 6544528?

THE REGENTS OF THE UNIV. 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 6544528 expire?

Our index shows an expiration date of Apr 3, 2023 (0 years from today). Confirm material dates against USPTO, FDA Orange Book, or qualified counsel before contractual decisions.