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:
Nov. 26, 1991
Filed:
Apr. 20, 1989
Applicant:
Inventor:
Richard J Molnar, Willoughby, OH (US);
Assignee:
Elsag International B.V., Amsterdam, NL;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ; H03K / ; H03K / ; H01S / ;
U.S. Cl.
CPC ...
307311 ; 307270 ; 307261 ; 328 28 ; 372 38 ;
Abstract
An input circuit for conditioning a control signal having a variety of waveforms and voltage levels, comprises a pair of input terminals having a metal oxide varistor connected thereacross. One terminal is connected to the base of a transistor thru a resistor, the emitter of the transistor driving an opto-coupler for isolating the control signal from a micro-processor which receives the control signal over an inverter having a schmitt trigger input.