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:
Jun. 27, 1989
Filed:
Jun. 06, 1988
Satoshi Ohta, Tokyo, JP;
Kouzi Tanagawa, Tokyo, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
In IC card with a built-in IC, comprising an external power supply terminal and a solar battery, the external power supply terminal is connected to an IC internal power supply line through a first switch, the solar battery is connected to the IC internal power supply line through a second switch, and a voltage detection circuit is connected to the external power supply terminal. When the voltage detection circuit detects a voltage on the external power supply terminal, it switches ON the first switch and switches OFF the second switch. When it does not detect a voltage on the external power supply terminal it switches OFF the first switch and switches ON the second switch.