Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1978-11-13
1980-05-20
Smith, Gary L.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
51317, B24B 1922
Patent
active
042032571
ABSTRACT:
Multilaminate printed circuit boards have at least three conductor layers separated by two insulator layers. After drilling through the boards, cleaning of the drilled hole is accomplished by forcing a slurry of granular abrasive grit in a liquid carrier through the hole. Manifolds direct the slurry through the holes thereby cleaning them.
REFERENCES:
patent: 2419448 (1947-04-01), Gordon
patent: 3009468 (1961-11-01), Eberle
patent: 3039234 (1962-06-01), Balman
patent: 3521412 (1970-07-01), McCarty
patent: 3728821 (1973-04-01), Perry
patent: 3931828 (1976-01-01), Lawler
Jamison John W.
Masciello, deceased Vincent A.
Welty William R.
Dicke, Jr. Allen A.
Hughes Aircraft Company
MacAllister W. H.
Smith Gary L.
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