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:
Apr. 11, 1989
Filed:
Apr. 09, 1987
Yoshio Hattori, Tokyo, JP;
Seiko Instruments Inc., Tokyo, JP;
Abstract
A variable capacitive semiconductor element is connected to a piezo-electric resonator for controlling the oscillating frequency thereof according to the variable capacitance of the capacitive element. The variable capacitive semiconductor element comprises a floating electrode disposed on and electrically isolated from a semiconductor substrate for storing electric charge to form a capacitance region in the semiconductor substrate, a control electrode for injecting electric charge into the floating electrode to determine the amount of capacitance, and a terminal electrode for connecting the variable capacitive element to the piezo-electric resistor. A bias circuit is connected to apply a given voltage to the terminal electrode to adjust the amount of capacitance according to the given voltage.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile