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. 24, 1987
Filed:
Jun. 21, 1984
Kosuke Nishimura, Yamatokoriyama, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
In an electronic apparatus, for example, a programmable calculator, a portable or handheld computer, a memory module, or a data collector, incorporating a battery backup RAM, the present invention provides means for first checking the memory contents when the power-OFF command has been activated, and then causes the results of the checking to be stored in a specific area of the RAM. When the memory contents checking command has been activated, the system rechecks the memory contents to see if the memory contents have varied. The invention securely confirms whether the memory contents of either the effective programs or data have been correctly backed up when either replacing the battery or during storage of an electronic apparatus that uses the battery backup RAM. This is particularly effective for portable or handheld programmable computers.