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. 23, 1996
Filed:
Jun. 14, 1994
Ronald W Pearson, Denton, TX (US);
Kevin E Deierling, Dallas, TX (US);
Clark R Williams, Plano, TX (US);
Dallas Semiconductor Corporation, Dallas, TX (US);
Abstract
An integrated circuit which includes not only a real time clock, but also an elapsed time counter, and a third counter. The elapsed time counter measures the total number of seconds during which a system has been powered up. The third counter is a 'cycle counter,' which measures the number of times a power cycle (power-up and power-down) has occurred. Thus, by reading the cycle counter and the elapsed time indicator, the general power history of a system can readily be determined, even if the system itself has totally failed. This integrated circuit is battery backed, and is advantageously combined with a system for which power history must be maintained.