Plastic and nonmetallic article shaping or treating: processes – With step of cleaning – polishing – or preconditioning...
Patent
1983-07-22
1984-11-13
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
With step of cleaning, polishing, or preconditioning...
249141, 249142, 264 451, 264 453, 264 469, 264255, 343909, 343910, 343911R, 425812, 425817R, 521123, B29D 2704
Patent
active
044825137
ABSTRACT:
A microwave lens is constructed of a homogeneous body of closed cell rigid polyurethane foam with aluminum flakes dispursed throughout and having a configuration defining an axis and opposed lens surfaces. The method of the invention includes selecting a mold having a cavity of the appropriate configuration, preheating the mold, and filling the mold with a mixture of low density polyurethane foam components and fine aluminum flakes evenly dispersed throughout the foam structure allowing the mixture to cool and form a body of the appropriate configuration.
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Anderson Philip
Baker Freling E.
General Dynamics Pomona Division
Johnson Edward B.
Martin Neil F.
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