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:
Mar. 01, 1977
Filed:
Nov. 24, 1975
William B Mason, Arlington, TX (US);
TECCOR Electronics, Inc., Euless, TX (US);
Abstract
Circuitry operating as a time delay/holding relay whereby a connection is established between a pair of output terminals whenever power is applied between input terminals and for a timed period after the receipt of a predetermined signal. A first integrated circuit is connected as a free running multivibrator to generate a pulse train for maintaining a bilateral thyristor in its conductive state to close the connection. A second integrated circuit, identical to the first, is utilized to enable the first integrated circuit. The second integrated circuit is connected as a free running multivibrator but oscillations are disabled until the receipt of the predetermined signal. This maintains the enabling signal for the specified time period after the signal is received. External connections of components to the second integrated circuit changes the internal operation of that circuit.