Method and apparatus for masking removable optical lens markings

Details Method and apparatus for masking removable optical lens markings Method and apparatus for masking removable optical lens markings

1997-05-20

1998-08-11

Le, H. Thi

Stock material or miscellaneous articles

Two dimensionally sectional layer

With frame, casing, or perimeter structure

351 41, 351 54, 351 55, 351174, 428 46, 428 54, 428 80, 428101, 428343, 428352, 428543, B32B 1504, G02C 706

Patent

active

057925372

ABSTRACT:
A method and apparatus for protecting removable markings on an optical lens during grinding thereof to a desired prescription. A mask is placed over the markings prior to application of an adhesive tape, to which a low temperature alloy block is bonded for holding of the lens during grinding. The mask preferably covers only the markings, and is transparent to allow alignment thereof. Preferably the mask is held in place on the lens surface without the use of an adhesive, although a low tack adhesive may be used which does not remove the markings when the mask is peeled away from the lens. A preferred material for the mask is a static cling vinyl.

REFERENCES:
patent: 4145125 (1979-03-01), Chika
patent: 4221083 (1980-09-01), Carroll
patent: 4781957 (1988-11-01), Brown et al.
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patent: 4925518 (1990-05-01), Wasserman et al.
patent: 4942696 (1990-07-01), Winthrop et al.
patent: 4985302 (1991-01-01), Sala et al.
patent: 5101603 (1992-04-01), Sevilla
patent: 5116676 (1992-05-01), Winslow
patent: 5343657 (1994-09-01), Ohlin, Jr.

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