The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 10, 2026
Filed:
Oct. 01, 2021
Hewlett-packard Development Company, L.p., Spring, TX (US);
Gary T. Brown, Boise, ID (US);
Vincent C. Skurdal, Boise, ID (US);
Hewlett-Packard Development Company, L.P., Spring, TX (US);
Abstract
Secure circuitry of an integrated circuit detects a duration of a clock cycle of a crystal oscillator external to the integrated circuit, using a digital ring oscillator internal to the integrated circuit and having a higher frequency than the crystal oscillator. The secure circuitry calculates a variation in the duration of the clock cycle. In response to the duration being greater than a maximum duration limit, the duration being less than a minimum duration limit, and/or the variation being greater than a maximum variation limit, the secure circuitry performs an action.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile