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:
May. 07, 1985
Filed:
Mar. 08, 1984
Douglas J Hall, Newark Valley, NY (US);
Robert F Langley, Vestal, NY (US);
Edwin L Thomas, Apalachin, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A process is provided for modifying internal circuits in a multilayer printed circuit board by modifying the glass master which produces the internal circuit patterns. An inexpensive film copy of the glass master to be changed is used to identify the circuit lands to be removed. Holes are made in the film at these locations thereby removing the image of the land and these alterations are verified in accordance with the engineering change instructions. The perforated film is used as a template to alter the glass master by removing the emulsion through the holes in the film and then the glass master is verified and used to produce the modified circuit board.