Plastic and nonmetallic article shaping or treating: processes – With step of making mold or mold shaping – per se – Utilizing surface to be reproduced as an impression pattern
Patent
1982-07-06
1984-01-03
Epstein, Henry F.
Plastic and nonmetallic article shaping or treating: processes
With step of making mold or mold shaping, per se
Utilizing surface to be reproduced as an impression pattern
249 61, 264255, 264316, 264317, 264DIG44, B28B 734
Patent
active
044241836
ABSTRACT:
A destructible core is formed from a frangible plastic shell filled with inert ballast. The core is used for forming complex cavities in the production of cast resin parts.
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patent: 3136831 (1964-06-01), Zinn
patent: 3692551 (1972-09-01), Weaver
patent: 4155970 (1979-05-01), Cassell
Baker International Corporation
Epstein Henry F.
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