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. 29, 2000
Filed:
Sep. 29, 1998
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
An electronic device including an internal battery and an expansion battery can not be operated when the charge in both batteries is drained. Accordingly, when charging the batteries, a control circuit, after confirming that the internal battery is not fully charged, sets an FET to a conductive state and an FET to a non-conductive state. The result is that charging occurs from the internal battery provided the internal battery is not fully charged. After the internal battery is fully charged, the control circuit sets the FET to a non-conductive state and the FET to a conductive state so that this time the expansion battery is charged. Thus, if a short operating time is sufficient, the internal battery can be rapidly charged so that the electronic equipment can be operated by itself after charging for only a short period.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile