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. 20, 2001
Filed:
Jul. 02, 1999
Shinichi Nakane, Okazaki, JP;
Yutaka Matsunaga, Yokkaichi, JP;
Tomoo Muramatsu, Nisshinn, JP;
Kazuyoshi Horikawa, Tenryu, JP;
Other;
Abstract
An improved charging system for preventing battery deterioration and for accurate indication of the remaining battery charge level includes an electric power tool (,) and a charger (,). The electric power tool (,) is provided with an internal rechargeable batteries (,) and a second controller (,). The charger (,) is provided with circuitry for charging, a microcomputer (,), and discharge circuitry which is comprised of a manually-operated battery refreshing button (,), a discharge relay (,) and a discharge resistor (,). Upon depression of the battery refreshing button (,), the microcomputer (,) causes the batteries (,) of the electric power tool (,) to be charged to a full level and discharged to a predetermined level twice. When the two-cycle operation of full charge and discharge is completed, the second controller (,) of the electric power tool (,) updates the remaining charge level of the batteries (,).