Radiation imagery chemistry: process – composition – or product th – Radiation modifying product or process of making – Radiation mask
Patent
1984-03-08
1985-05-07
Martin, Roland E.
Radiation imagery chemistry: process, composition, or product th
Radiation modifying product or process of making
Radiation mask
430 22, 430329, 430331, 430311, G03F 900
Patent
active
045158789
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.
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patent: 3506442 (1970-04-01), Kerwin
patent: 3649273 (1972-04-01), Miller
patent: 3748975 (1973-07-01), Tarabocchia
patent: 4170819 (1979-10-01), Peter et al.
patent: 4262186 (1981-04-01), Provancher
patent: 4383016 (1983-05-01), Postupack
Couden, D. V., IBM Technical Disclosure Bulletin, vol. 2, No. 1, Jun. 1959, p. 1.
IBM TDB, "Producing Accurate Photographic Plates", D. V. Couden, vol. 2, No. 1, Jun. 1959.
IBM TDB, "Altering Circuit Connections", R. R. Rodite, vol. 11, No. 8, Jan. 1969.
Hall Douglas J.
Langley Robert F.
Thomas Edwin L.
Bouchard John H.
Dees Jos,e G.
International Business Machines - Corporation
Martin Roland E.
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