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:
Jun. 14, 1983
Filed:
Mar. 09, 1981
Applicant:
Inventors:
Thomas E Salzer, Bedford, MA (US);
John R Saxelby, Jr, Dallas, TX (US);
Assignee:
Raytheon Company, Lexington, MA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
B23K / ;
U.S. Cl.
CPC ...
219 5622 ; 219 561 ; 2191 / ; 2191304 ;
Abstract
A method and apparatus for forming a spherical shape on the end of an aluminum wire using a relatively low voltage across an arc gap to heat the end. Because the voltage is below the minimum sparking potential, a high voltage impulse is superimposed on the electrode to ionize the gas therebetween and initiate the arc. The gap may be in a protective environment such as an inert gas to prevent the formation of additional oxide. The wire may then be used in an aluminum ball bond.