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:
Sep. 18, 1979
Filed:
Mar. 02, 1978
John H Auer, Jr, Fairport, NY (US);
David B Rutherford, Rochester, NY (US);
General Signal Corporation, Stamford, CT (US);
Abstract
A microprocessor based vital delay circuit is provided which is arranged to emit an output no less than a predetermined time after an input stimulus. The predetermined time, which corresponds to the delay, is controlled by selecting the relationship between two quantities. A digital processor performs a series of computations on the two quantities, each computation is arranged to take unit time and by selecting the proper relationship between the two quantities, the total series of computations takes a predetermined amount of time. Before the output is allowed to occur, several checks are performed to insure that no hardware or software failures have erroneously generated the result. One novel checking technique insures that the clock frequency has not changed, and this technique is applicable to a wide variety of devices in which digital techniques are employed.