Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1991-12-06
1992-07-14
Powell, William A.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
174256, 428325, 428328, H05K 100, B32B 300, B32B 1800, B32B 516
Patent
active
051301792
ABSTRACT:
A multilayer printed wiring board and a method of manufacturing the board are provided. The board has a printed wiring incorporating metal powder consisting of fine grains and a layer of insulation material which is adhesive when uncured. The fine grains of the metal powder are securely fixed to the layer of insulation material so as to strengthen the bond between the printed wiring and the layer of insulation material. Alternatively, the layer of insulation material incorporates a layer of glass powder to enhance the insulation thereof. In this case, the layer of glass powder is made by evenly spreading glass powder on a first coat of uncured adhesive insulation material. The layer of glass powder is covered by a second coat of insulation material after the first coat of insulation material is cured so that the layer of glass powder is sandwiched between the two coats of insulation material. The metal powder is evenly spread on a layer of insulation material or the second coat of insulation material while the insulation material is uncured and adhesive. After the insulation material is cured, the surface of the insulation material covered with metal powder is copper-plated and is etched to form a printed wiring incorporating the metal powder.
REFERENCES:
patent: 2739881 (1956-03-01), Kepple
patent: 2778762 (1957-01-01), Eisler
patent: 3330695 (1967-07-01), Curran
patent: 3808042 (1974-04-01), Dietz
patent: 4720394 (1988-01-01), Kojima et al.
patent: 4994302 (1991-02-01), Kellerman
patent: 5055321 (1991-10-01), Enomoto et al.
patent: 5061438 (1991-10-01), Lillie et al.
Miyazaki Masafumi
Tanabe Teruhisa
Tomura Yoshiharu
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