Backup material for small bore drilling

Details Backup material for small bore drilling Backup material for small bore drilling

1986-02-14

1987-02-17

Herbert, Thomas J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428215, 428412, 428421, 428458, 428461, 428464, 428901, B32B 1508, B32B 1510, B32B 2710

Patent

active

046439366

ABSTRACT:
A backup material for small bore drilling in hard crystalline materials, such as multilayer circuit boards containing polyimide/glass, polyimide kevlar or modified epoxy BT/glass, includes at least one layer of hard crystalline material. Standard LCOA material with an additional layer selected from the group comprising polyimides, fluorocarbons and high temperature polycarbonates has proven successful.

REFERENCES:
patent: 4343846 (1982-08-01), Kohn
patent: 4408365 (1983-10-01), Palmer
patent: 4456657 (1984-06-01), Cassat et al.
patent: 4562119 (1985-12-01), Darms et al.

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