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. 20, 1990
Filed:
Feb. 03, 1989
Sharada Raghuram, Darien, IL (US);
Gary J Pregont, Elgin, IL (US);
Les Updegrove, Schaumburg, IL (US);
Thomas R Klaus, Palatine, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A radio-on timer and transmission-on timer of a cellular telephone (100) provide an accurate record of the total amount of time since manufacture that the cellular telephone (100) and its transmitter (160), respectively, have been turned on for the purpose of measuring the in-field reliability thereof. The cellular telephone (100) includes a processor (110) that is responsive an interrupt signal (117) for incrementing and storing an interrupt timer, the radio-on timer and the transmission-on timer in a volatile memory 114. When the processor (110) senses that power has been switched off, the processor (110) reads out from the volatile memory (114) the radio-on timer and transmission-on timer, reads out from the non-volatile memory (112) the previously stored radio-on timer and transmission-on timer, adds them together and stores the summed radio-on timer and transmission-on timer back in the non-volatile memory (112). The unique radio-on and transmission-on timers of the present invention may be advantageously utilized in any radio including a transmitter.