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. 13, 1983
Filed:
Sep. 10, 1981
Applicant:
Inventor:
Alexander Gotman, Santa Monica, CA (US);
Assignee:
Asta, Ltd., Irvine, CA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
B23K / ;
U.S. Cl.
CPC ...
2191 / ; 2191 / ;
Abstract
In securing a semiconductor chip to a substrate of ceramic material or the like, a de-focused laser beam having a wave length to which the substrate is substantially opaque is directed over a relatively large area of the reverse side of the substrate. Heat generated at the reverse side of the substrate then flows through the substrate to heat bonding material that is placed between the engaging surfaces of the chip and substrate. In this manner direct heating of the chip is avoided or minimized, and damage to both chip and substrate is also minimized.