The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 12, 1977
Filed:
May. 27, 1976
Edwin J Illig, Corning, NY (US);
Corning Glass Works, Corning, NY (US);
Abstract
A method of heat treating a plurality of geometrically congruent and flat lens blanks made from a phototropic glass, such heat treating being performed for development of the phototropic properties thereof. A plurality of lens blanks are formed into a stack by alternately positioning and clamping similar areas between the flat surfaces of two flat, annular, spacer members. The stack is then rotated about the longitudinal axis oriented in a substantially horizontal position while evenly heating the lens blanks to the phototropic development temperature of the glass. The stack of blanks is then vertically positioned while continuing the heating thereof and part of each of the blanks sags into the hollow of the spacer member therebelow to form such part of each blank into a curved configuration for an eyeglass lens.