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:
Feb. 06, 1996
Filed:
Jun. 23, 1993
Applicant:
Inventors:
Jean-Louis Goudard, Guyancourt, FR;
Denis Pottier, L'Hay les Roses, FR;
Joseph Hoppe, Les Molieres, FR;
Assignee:
U.S. Philips Corporation, New York, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A63B / ; A63F / ;
U.S. Cl.
CPC ...
2731 / ; 380-3 ; 380-4 ; 380 25 ; 364700 ;
Abstract
The clock circuit is formed by an oscillator (10-12) which is coupled to a counter/divider circuit (15) provided with read accesses (30). In order to prevent falsification of its data, the circuit is formed as a protected casing and includes a protected access circuit (50) which is connected between said accesses and the counter/divider circuit. Furthermore, a circuit for monitoring the frequency of the oscillator may be provided (100-50).