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. 23, 1981
Filed:
May. 14, 1979
Applicant:
Inventors:
Odo J Struger, Chagrin Falls, OH (US);
Joseph R Branc, Wickliffe, OH (US);
Assignee:
Allen-Bradley Company, Milwaukee, WI (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
250551 ; 307311 ;
Abstract
An input circuit for a digital control system includes a rectifier circuit, a current limiting circuit and a set of zener diodes which can be selectively employed to receive a wide variety of signals from industrial sensing devices. The signal is generated to an output drive circuit by an optocoupler which provides electrical isolation. The output drive circuit generates a logic level signal which is compatible with the digital electronic control system. The input circuit is particularly well suited for fabrication as an integrated circuit.