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
1991-07-30
1993-09-07
Woo, Jay H.
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
264232, 264313, 264344, 65901, 423338, B29C 3900, B29C 7100, C01B 3314, C03B 1902
Patent
active
052426475
ABSTRACT:
The invention describes a method for making monolithic castings of transparent silica aerogel with densities in the range from 0.001 g/cm.sup.3 to 0.6 g/cm.sup.3. Various shapes of aerogels are cast in flexible polymer molds which facilitate removal and eliminate irregular surfaces. Mold dimensions are preselected to account for shrinkage of alcogel which occurs during the drying step of supercritical extraction of solvent.
REFERENCES:
patent: 3320344 (1967-05-01), Slipp
patent: 3520961 (1970-07-01), Suda et al.
patent: 4419115 (1983-12-01), Johnson, Jr.
patent: 4776867 (1988-10-01), Onorato et al.
Grzybicki Daryl S.
Hackett Nora
Regents of the University of California
Sartorio Henry P.
Smith Duane S.
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