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. 22, 2006
Filed:
Apr. 01, 2004
Minoru Sudo, Chiba, JP;
Takashi Niwa, Chiba, JP;
Norio Chiba, Chiba, JP;
Susumu Ichihara, Chiba, JP;
Minoru Sudo, Chiba, JP;
Takashi Niwa, Chiba, JP;
Norio Chiba, Chiba, JP;
Susumu Ichihara, Chiba, JP;
Seiko Instruments Inc., Chiba, JP;
Abstract
A battery pack has a secondary battery connected to a plus side terminal. A protective circuit protects the secondary battery from overcharge and over-discharge. A calculation circuit operates with a minus side terminal as a reference for calculating a remaining capacity of the secondary battery. An N-channel MOS transistor is connected between the secondary battery and the minus terminal for controlling charge and discharge of the secondary battery in accordance with a signal from the protective circuit. A level shifter circuit is connected between the calculation circuit and a communication terminal.