Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Including step of mold making
Patent
1989-10-23
1990-03-06
Lindsay, Robert L.
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Including step of mold making
65 37, 264219, 264222, 425808, B29D 1100
Patent
active
049064223
ABSTRACT:
A method is disclosed for constructing a glass mould, and particularly the primary glass mould member, for use in casting multifocal, ophthalmic lenses from organic polymers. The method comprises pressing a glass segment with a cavity, removing the base portion of the segment to form a perforation, mounting the perforated segment on a second glass body, and fusing the assembly to form a blank for finishing. For trifocal lenses, a composite, perforated segment is formed and sealed in a depression on a major element to form a blank.
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Corning Incorporated
Janes Jr. Clinton S.
Lindsay Robert L.
Peterson Milton M.
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