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:
Dec. 31, 1996
Filed:
Jan. 05, 1995
Michael D Fehnel, Fuquay-Varina, NC (US);
Ericsson Inc., Research Triangle Park, NC (US);
Abstract
A current time of day is generated in a cellular radiotelephone by monitoring changes in the registration ID (REGID) field of the overhead messages as the REGID is incremented. The cellular radiotelephone user is prompted to indicate a time of day, and a corresponding REGID value is obtained. The time interval between REGID updates is determined. When a current time of day is required, a current REGID value is obtained and a current time of day is calculated based on the user indicated time of day, the difference between the REGID values and the update interval. Current time of day may thereby be generated in cellular radiotelephone systems which do not broadcast a current time of day, without the need for real time clock chips in the cellular radiotelephone.