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:
Aug. 07, 1984
Filed:
Jul. 13, 1982
Applicant:
Inventor:
Shan C Sun, Coral Springs, FL (US);
Assignee:
Westinghouse Electric Corp., Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02H / ;
U.S. Cl.
CPC ...
361 64 ; 361 66 ; 361 68 ; 361 69 ;
Abstract
Protective relaying apparatus of the pilot type, incorporating a direct transfer trip function (DTT) which reliably and securely utilizes the same communication channel utilized by the pilot relaying function. The DTT function operates within the constraints of a PPM modem, utilizing a signal extracted from the carrier signal, to provide a perfectly synchronized tone for the DTT signal.