Stock material or miscellaneous articles – Circular sheet or circular blank
Patent
1993-10-08
1996-04-30
Ahmad, Nasser
Stock material or miscellaneous articles
Circular sheet or circular blank
351163, 351164, 351168, 351172, 359462, 428156, 428161, 428212, 428213, 428215, 428220, 428426, C03B 2322
Patent
active
055123449
ABSTRACT:
A button for forming a segment of a multifocal lens the button comprising a first portion composed of a lead oxide-containing glass, a second portion composed of a glass which contains substantially no lead oxide, the first and second portions being adjacent and forming a face of button for machining to a desired shape, and a third portion composed of a glass which contains substantially no lead oxide, the first and second glass portions being fused the third glass portion on a side of the first and second portions remote from the said face of the button. The invention also provides a method of making a multifocal lens by (a) providing a button in accordance with the invention, (b) machining the said face of the button to the desired shape to match a recess in a lens blank; (c) disposing the button in the recess with the machined face adjacent to the face of the recess; (d) fusing the button in the recess; and (e) removing by grinding the third portion, and unwanted regions of the first and second portions so as to form a desired lens surface.
REFERENCES:
patent: 1957117 (1934-05-01), Tillyer
patent: 2885829 (1959-05-01), Emerson
patent: 2923201 (1960-02-01), Beasley
patent: 2963823 (1960-12-01), Ohliger
patent: 3649236 (1972-03-01), Rosenbauer
patent: 3975093 (1976-08-01), Upton
patent: 4992086 (1991-02-01), Buckley
Kelley William C.
Neal George H.
Ahmad Nasser
Sola International Holdings Ltd.
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