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. 13, 2004
Filed:
Feb. 23, 2001
Junji Ishigaki, Hachioji, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
When any application can be operated, a control section first indexes a table for defining validness or invalidness of an operating key corresponding to an application in a memory. Then, if the control section detects that any key is operated, the control section starts to turn ON a back light. Thereafter, the control section detects that any key is manipulated again before a lighting time set by a timer elapses, and it is decided whether the operation section is a valid key. If the valid key is operated, a first back light for illuminating the most neighboring part of the valid key and a second back light for illuminating a display section are continuously turned ON until the lighting time set by the timer of the control section elapses. However, if the lighting time set by the timer of the control section elapses, the back light is turned OFF.