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:
Jan. 19, 2016
Filed:
Dec. 23, 2011
Amedeo Veneroso, Caserta, IT;
Vitantonio Distasio, Caserta, IT;
Francesco Varone, Bellona, IT;
STMICROELECTRONICS INTERNATIONAL N.V., Amsterdam, NL;
Abstract
A clock frequency of a clock signal is calculated, with the clock signal being received by an IC card from a terminal or an internal clock within the IC card. A first time-stamp is received from the terminal, and a first value of the timer is set. The timer of the IC card is started when the first time-stamp is received. A second time-stamp is received, and a second value of the timer is read when the second time-stamp is received. The frequency is calculated by comparing a difference between the second and the first timer values, and a difference between the second and the first time stamps.