Method for making hot-pressed thermoplastic elements for glass-p

Details Method for making hot-pressed thermoplastic elements for glass-p Method for making hot-pressed thermoplastic elements for glass-p

1978-09-05

1980-04-22

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

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

264320, B29D 1100, B29C 300

Patent

active

041995384

ABSTRACT:
A method for making curved zero-power plastic lens elements of precise curvature and excellent optical quality, wherein thin (not exceeding 15-mil) commercial-grade thermoplastic sheet is reformed through a hot-pressing procedure using optically smooth (e.g., glass) reforming surfaces having a specified relation of curvature, is described.

REFERENCES:
patent: 2302918 (1942-11-01), Smith
patent: 2330837 (1943-10-01), Mullen
patent: 2635289 (1953-04-01), Owens
patent: 2644985 (1953-07-01), Crandon
patent: 3681483 (1972-08-01), Moore

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