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. 15, 1993
Filed:
Jul. 23, 1991
Applicant:
Inventor:
Martin Schuyler, Hastings-on-Hudson, NY (US);
Assignee:
Cox & Company, Inc., New York, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B / ;
U.S. Cl.
CPC ...
219497 ; 219501 ;
Abstract
A control system and circuit has a positive feedback characteristic but is nonetheless stable. Stability is achieved by superimposing a negative feedback loop with a short time constant and a positive feedback loop with a long time constant. The system and circuit are useful in situations where the sensor and the controlled variable (e.g. a heater) are well-coupled.