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:
Nov. 22, 1983
Filed:
May. 06, 1982
Applicant:
Inventor:
H James Wilson, La Grange, KY (US);
Assignee:
Safetran Systems Corporation, Louisville, KY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B61L / ; G08C / ;
U.S. Cl.
CPC ...
340 47 ; 246 / ; 2461 / ; 340658 ;
Abstract
Means for differentiating between traction current and signal current in an electrified railroad includes a first input transformer providing an input signal of the same frequency and phase as the track signal current. A second input transformer is connected to the track to provide a track signal. There are means for comparing the phase and frequency of the input signal and the track signal and means responsive to an output from the comparison means indicating a correct comparison for providing a relay driving signal.