Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1984-08-02
1986-09-02
Swisher, Nancy A. B.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428901, 428408, 428418, 428245, H05K 104, B05D 512
Patent
active
046095861
ABSTRACT:
A printed wiring board laminate is disclosed that is particularly suitable for use with leadless surface mounted devices such as ceramic chip carries. The laminate combines a low coefficient of thermal expansion in the X-Y direction with thermal conductivity. In one embodiment, the laminate comprises a support fabricated from graphite fiber reinforced metal adhesively secured to a printed wiring board fabricated from dielectric (e.g., glass) fiber reinforced resin. The support has an X-Y coefficient of thermal expansion less than about 4 ppm/.degree.C., and the printed wiring board has a coefficient of thermal expansion greater than about 10 ppm/.degree.C. In a second embodiment, the support comprises a core of graphite fiber reinforced metal or resin sandwiched between two metal sheets.
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Jensen Warren M.
Wilkinson William C.
Swisher Nancy A. B.
The Boeing Company
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