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. 09, 1986
Filed:
May. 16, 1985
Applicant:
Inventor:
Harry S Koontz, Pittsburgh, PA (US);
Assignee:
PPG Industries, Inc., Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C03C / ; G01R / ; G01R / ;
U.S. Cl.
CPC ...
65 29 ; 65 50 ; 65 591 ; 65160 ; 324 52 ; 3241 / ;
Abstract
A method and apparatus for detecting discontinuities in electric conductor heating lines in automobile heated back lights is disclosed. The apparatus includes a 'Hall effect' probe, a microprocessor, a display, a stepping motor drive, an optical scanner and associated circuitry. The method includes the steps of energizing the heating grid and moving a Hall effect probe in the vicinity of each conductor line. Any heater line having discontinuity will lack a detectable magnetic field.