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:
Jun. 27, 1989
Filed:
Aug. 27, 1982
Applicant:
Inventor:
Robert H Lacy, Bartlesville, OK (US);
Assignee:
Phillips Petroleum Company, Bartlesville, OK (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K / ; H03K / ;
U.S. Cl.
CPC ...
307362 ; 307290 ;
Abstract
A combination of an npn transistor, a pnp transistor and associated circuitry is utilized to provide a threshold amplifier which has a variable threshold. The voltage level at the emitter of the npn transistor, when the npn transistor is off, determines the variable threshold. A second pnp transistor is preferably utilized to provide a means by which the threshold voltage can be set to a very low voltage level.