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:
Aug. 01, 2006
Filed:
Oct. 04, 2001
Toshikatsu Hosoi, Tokyo, JP;
Toshikatsu Hosoi, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
The invention provides a portable telephone apparatus wherein, when a necessary voltage is not obtained from a cell because the cell is removed or consumed, data can be backed up with a simple configuration and at a low cost. A cell is removably accommodated in a cell accommodation portion of the body of a portable telephone apparatus, and the cell accommodation portion is closed up with a cell cover. Opening or closing of the cell cover is detected by a switch serving as a cell cover opening/closing detection apparatus in the body, and is outputted as an interrupt signal to a CPU through a control circuit. When the remaining power of the cell becomes little, a cell remaining power detection signal is outputted as another interrupt signal to the CPU through the control circuit. In response to either interrupt signal, stored data of a RAM are transferred to and protected by a flash ROM.