Blocking shim and method for prescription-laboratory processing

Details Blocking shim and method for prescription-laboratory processing Blocking shim and method for prescription-laboratory processing

1988-06-09

1990-07-24

Rose, Robert

Abrasive tool making process, material, or composition

Impregnating or coating an abrasive tool

51216LP, 51284R, 33 28, B24B 13005

Patent

active

049426966

ABSTRACT:
A thin sheet of flexible material shaped like an inverted "T", is applied to the aspheric distance portion of a progressive-addition ophthalmic lens, to provide stable three-point contact for blocking the lens prior to second-side surfacing in the prescription laboratory.

REFERENCES:
patent: Re31897 (1985-05-01), Johnson
patent: 2166037 (1939-07-01), Campos
patent: 3140568 (1964-07-01), Beasley
patent: 4227349 (1980-10-01), Bicskei

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