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:
Dec. 16, 1980
Filed:
Jan. 10, 1978
Applicant:
Inventor:
Isao Kondo, Hachioji, JP;
Assignee:
Olympus Optical Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K / ;
U.S. Cl.
CPC ...
307237 ; 3072 / ; 307304 ; 307353 ;
Abstract
A signal system includes a switching element which is turned on or off in response to an electrical signal. The signal system includes a field effect transistor which is arranged such that the drain current does not change in response to a variation in voltage across the source and the drain of the transistor, whereby every signal is applied to the switching element when a circuit voltage is applied to the switching element while a signal is prevented from being applied to the switching element when a circuit voltage is not applied to the switching element.