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:
Jan. 01, 2002
Filed:
Dec. 04, 2000
Nobuhiro Takano, Hitachinaka, JP;
Shigeru Moriyama, Kumamoto, JP;
Hitachi Koki Co., Ltd., Tokyo, JP;
Abstract
A battery charger is capable of accurately determining that a battery has reached a fully charged condition regardless of the kind of the batteries to be charged, the condition of the battery, battery temperature at the time when charging starts, charge current, and ambient temperature. A battery temperature is sampled at every predetermined timing, and a change in battery temperature rise gradient is computed each time the battery temperature is sampled. It is determined that the battery has reached the fully charged condition based on a transition changing from increment to decrement of the change in battery temperature rise gradient.