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:
Apr. 18, 1994
Motoki Ide, Tokyo, JP;
Hiroaki Shibayama, Shizuoka, JP;
NEC Corporation, , JP;
Abstract
A radio selective calling receiver including an exchangeable first battery and a second battery which can be charged by the first battery. A CPU stops operating at a stop voltage. A RAM stores a user data. A stop detector detects operational stop of the CPU. A power supply changer changes one of the first and second batteries into the other and selectively supplies one of electric energies of the batteries to the CPU, RAM and stop detector. The minimum operable voltages of the RAM and the stop detector are lower than the stop voltage. The first battery supplies its electric energy to the CPU, RAM and stop detector until the supply voltage of the first battery lowers to the stop voltage. The power supply changer changes the first battery into the second battery when the operational stop of the CPU is detected, so that the second battery supplies its electric energy to the CPU, RAM and stop detector until the first battery thus lowered in supply voltage is exchanged by a new one. The capacity of the first battery can be effectively used without any malfunction of the receiver and no troublesome reinput action is required for the user.