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
1993-08-20
1994-12-27
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
264154, 2643282, 264DIG30, B29C 3340
Patent
active
053763238
ABSTRACT:
The method of the present invention creates a hollow plastic prosthesis using the following steps. First, a mold of the prosthetic article is created and the mold is injected with room temperature vulcanizable plastic. The mold containing the RTV plastic is maintained at a fixed temperature for a sufficient period of time for the outer most portions of the RTV plastic to form a vulcanized layer in proximity to the inner surface of the mold. The RTV plastic article is then removed from the mold and the remaining unvulcanized plastic is expressed from the interior. The opening is then sealed and the entire article is allowed to completely cure. The prosthetic article thus created is a one piece seamless article conforming substantially to the shape of the mold. The article is hollow and contains no openings communicating with the exterior so that the article retains flexibility and furthermore has the property of being compressible while retaining the ability to return to its original shape once pressure has been moved.
REFERENCES:
patent: 4661187 (1987-04-01), Beasley
patent: 4735754 (1988-04-01), Buckner
patent: 5091121 (1992-02-01), Nakada et al.
patent: 5133753 (1992-07-01), Bark et al.
Board of Trustees of University of Arkansas
Cox, Jr. Ray F.
Davis Robert B.
Woo Jay H.
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