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:
Aug. 03, 1993
Filed:
Jul. 01, 1991
Thomas A Bartush, Wappingers, NY (US);
James J Curtin, Fishkill, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A process of fabricating an electrical resistor and a product produced thereby in which trimming of a resistive element of a material exhibiting thermosetting properties is accomplished by in-situ annealing of one or more regions across the width of the resistive element to certain predetermined temperatures, thereby altering the crystal properties and the sheet resistance within those regions. Annealing is preferably done by laser radiation at levels below that at which any cutting or ablation of the resistive element will occur, thus avoiding defects in the resistor or associated circuits. By controlling laser radiation and the annealing process, virtually any desired trim slope may be obtained, resulting in improved trimming accuracy. Efficiency of the process is enhanced by annealing the resistive element to obtain compound trim slopes corresponding to coarse and fine trimming of the resistive element.