Plastic and nonmetallic article shaping or treating: processes – Removal of liquid component or carrier through porous mold...
Patent
1991-05-14
1992-08-04
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
Removal of liquid component or carrier through porous mold...
249113, 249134, 249141, 249189, 264219, B28B 736, B28B 126, E04G 910
Patent
active
051356929
ABSTRACT:
A concrete form with provision for draining excess water and air from wet concrete by placing fabric over a grid on the support portion of the form. A patterned surface of increased hardness results from use of the form. One embodiment results in concrete with a completely smooth surface.
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E. I. Du Pont de Nemours and Company
Nguyen Khanh P.
Woo Jay H.
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