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:
Jun. 13, 1995
Filed:
Aug. 19, 1992
Applicant:
Inventors:
Mitsuhiko Noda, Kyoto, JP;
Shozo Miyagawa, Kyoto, JP;
Assignee:
Rohm, Co., Ltd., Kyoto, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04M / ;
U.S. Cl.
CPC ...
379 68 ; 379 67 ; 379355 ; 379356 ; 379413 ; 365229 ; 369 15 ; 360 32 ;
Abstract
A data backup apparatus for temporarily storing the data stored in a volatile memory using an internal battery when the main power is stopped. When the operation of the internal battery is started, the data stored in the volatile memory as a digital signal is converted into an analog signal by a D/A converter, and then it is stored in a magnetic storage unit. When the power supply is restored, the data stored in the magnetic storage unit as the analog signal is read out and converted into the digital signal, and then it is restored to the volatile memory.