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:
Mar. 22, 1977
Filed:
Mar. 26, 1976
Applicant:
Inventors:
Koji Kataoka, Musashino, JA;
Hisayuki Uchiike, Musashino, JA;
Assignee:
Kabushikikaisha Yokogawa Denki Seisakusho, Tokyo, JA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03G / ; H03G / ; H03G / ; H03F / ;
U.S. Cl.
CPC ...
330145 ; 307237 ; 328171 ; 328172 ; 330 86 ;
Abstract
A variable resistance circuit comprising a field effect transistor, a plurality of amplifiers and a feedback circuit for one of the amplifiers with the equivalent resistance value derived from a circuit comprising the field effect transistor electrodes and a reference resistor being controlled by a digital signal or a pulse-width signal supplied to the feedback circuit.