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:
Oct. 25, 1994
Filed:
Oct. 29, 1992
Takayuki Asai, Tokyo, JP;
Yukio Sato, Shizuoka, JP;
NEC Corporation, Tokyo, JP;
Abstract
In a hand-held electronic apparatus, such as radio display pager, a control circuit is powered by a first battery to produce an control signal for operating an inductive device such as vibrator. A second battery is provided having an internal resistance lower than the internal resistance of the first battery. A capacitor is connected in parallel with the inductive device and the voltage developed thereacross is monitored by a voltage sensor, which produces a sensor output when the voltage exceeds a prescribed level. A first switching circuit is responsive to the control signal for coupling the inductive device to the second battery and responsive to the sensor output for decoupling it from the second battery. A second switching circuit also responds to the sensor output for coupling the inductive device to the first battery until the control signal ceases to exist.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile