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. 26, 1993
Filed:
Oct. 18, 1990
Applicant:
Inventors:
Kentoku Yamaguchi, Hino, JP;
Kenichi Sato, Hino, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04M / ;
U.S. Cl.
CPC ...
379387 ; 379413 ; 379355 ; 379356 ;
Abstract
A telephone set includes a volatile memory (14) for storing data such as telephone numbers or messages and a battery (17) for maintaining the data stored in the volatile memory (14). In order to prevent the data stored in the volatile memory (14) from being lost when the battery (17) is consumed, a detection circuit (18) detects the consumption of the battery (17) and supplies the voltage fed through a line from the telephone office side to the volatile memory (14) through a switch (19) on the basis of that detection. It is possible to transfer the data in the volatile memory to the non-volatile memory directly before the battery is consumed.