Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1981-02-09
1982-03-09
Herbert, Jr., Thomas J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
174 685, 427 96, 427 97, 428212, 428241, 428408, 428901, B32B 300, B32B 900, B05D 512
Patent
active
043189547
ABSTRACT:
A composite printed wiring board is provided wherein the surface of the board is fabricated from conventional fiber reinforced plastic laminates such as glass fiber reinforced epoxy laminates and that laminate is secured by means of a thermoset adhesive to a support member which is fabricated from graphite filament reinforced thermoset resin having a low coefficient of thermal expansion approaching zero. The unrestrained coefficient of thermal expansion of the printed wiring board is significantly greater than that of the support member. However, in the composite assembly, the apparent coefficient of thermal expansion of the printed wiring board is greatly reduced and can approximate the coefficient of thermal expansion of a ceramic chip carrier. The coefficient of thermal expansion of the printed wiring board in its thickness direction is only slightly reduced in the composite assembly.
REFERENCES:
patent: 3700538 (1972-10-01), Kennedy
patent: 4103102 (1978-07-01), Klein
patent: 4249302 (1981-02-01), Crepeau
patent: 4279783 (1981-07-01), Kehrer et al.
patent: 4284664 (1981-08-01), Rauch
Boeing Aerospace Company
Herbert, Jr. Thomas J.
Keck Harry B.
Murray Thomas H.
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