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:
Jan. 27, 1987
Filed:
Apr. 01, 1985
Applicant:
Inventor:
Gerald Dufrenne, LaVerne, CA (US);
Assignee:
Unitek Corporation, Monrovia, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23K / ;
U.S. Cl.
CPC ...
219109 ; 324 / ;
Abstract
Apparatus provides for measuring weld resistance of each of a group of weld sites that are subject to variation with respect to weld resistance. The apparatus includes circuitry for inducing a flow of alternating current in a weld site. The magnitude of the induced alternating current is substantially constant; in particular, the percentage variation in its magnitude is substantially less than the percentage variation in resistance to which the weld sites are subject. The apparatus further includes voltage responsive circuitry for producing a signal representative of the magnitude of the resistance of the weld site.