Method of forming thin thermoplastic elements of complex curvatu

Details Method of forming thin thermoplastic elements of complex curvatu Method of forming thin thermoplastic elements of complex curvatu

1978-09-05

1980-07-15

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Utilizing plasma, electric, electromagnetic, particulate, or...

264225, 264316, 264320, B29D 1100

Patent

active

042128366

ABSTRACT:
Thin thermoplastic film is reformed to provide matching elements for surfaces of complex curvature, such as the surfaces of compound or aspheric glass lenses. The film is hot-pressed between the curved surface to be matched and a pressing piece of similar curvature, formed by casting a low-melting-point alloy against the curved surface to be matched.

REFERENCES:
patent: 2644985 (1953-07-01), Crandon
patent: 2990574 (1961-07-01), De Carle
patent: 3240854 (1966-03-01), Ewer
patent: 3422168 (1969-01-01), Bowser
patent: 3542907 (1970-11-01), Wichterle
patent: 3594457 (1971-07-01), Wright
patent: 3662041 (1972-05-01), Hartman
patent: 4038014 (1977-07-01), Dusza et al.

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