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:
Apr. 09, 1991
Filed:
Sep. 06, 1990
Applicant:
Inventors:
Klaus G Schmitt, Giessen, DE;
Harald Knetsch, Herborn, DE;
Assignee:
Emhart Inc., Newark, DE (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23K / ;
U.S. Cl.
CPC ...
219 99 ;
Abstract
Method of controlling stud-welding apparatus wherein the lifting coil is essentially current and voltage free at the beginning of the plunge stroke but the plunge stroke is damped by a pulse current applied to the lifting coil a very short time before impact and ceased when the stud contacts the workpiece.