Patent · US Expired

Ophthalmic lens with locally variable index of refraction and method of making same

US4073579A · kind A · utility

79Cited by
12References
8Claims
0Family size

Assignee

Inventors

Key dates

Filing dateJun 9, 1976
Grant dateFeb 14, 1978
Priority date—
Expiry dateJun 9, 1996

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC03C23/008
  • WIPO fieldMaterials, metallurgy
  • WIPO sectorChemistry

Abstract

Ophthalmic lenses with locally variable indices of refraction produced from microporous glass bodies diffused with inorganic salts and rendered transparent by heat treatment. Local variations in refractive index result from differences in concentrations of the salts produced by controlled diffusion and/or selective leaching after impregnation of the porous bodies.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.