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:
May. 13, 1997
Filed:
Jan. 31, 1995
Applicant:
Inventors:
Lee A McConnel, Parkville, MO (US);
John H Johnson, Blue Springs, MO (US);
Assignee:
Harmon Industries, Inc., Blue Springs, MO (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B61L / ;
U.S. Cl.
CPC ...
246194 ; 246 / ;
Abstract
Inductive pickups for sensing coded cab current information employ short ferrite cores and exhibit a pronounced roll-off characteristic to provide a detection system that may be used with locomotives powered by alternating current traction motors. Desired response is enhanced by connecting the inductors in phase in a tuned circuit and by employing a cancelling coil in phase opposition that receives interfering motor noise but is insensitive to the coded information.