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:
Aug. 05, 1986
Filed:
May. 10, 1982
Applicant:
Inventors:
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ; H03K / ; H03K / ;
U.S. Cl.
CPC ...
307570 ; 307270 ; 307304 ; 307544 ; 307581 ; 357 43 ;
Abstract
A switching device and circuit comprises a bipolar transistor and at least two field effect transistors for controlling the bipolar transistor. A first field effect transistor has its drain and source connected across the collector-base of the bipolar transistor and a second field effect transistor has its drain and source connected across the base-emitter of the bipolar transistor. Gates of the first and second field effect transistors are connected in common and supplied with a voltage signal. The first field effect transistor is of an enhancement type and the second field effect transistor is of a depletion type.