公开(公告)号：DE2625313A1

公开(公告)日：1977-01-20

申请号：DE2625313

申请日：1976-06-03

Applicant: AMERICAN OPTICAL CORP

Inventor： KROHN DAVID A ,  GRAF ROBERT E ,  SOUTHBRIDGE MASS ,  DEEG EMIL W

IPC: G02C7/02 ,  C03C3/076 ,  C03C3/095 ,  C03C21/00 ,  G02B1/00 ,  G02C7/00

Abstract: An ophthalmic glass lens having a compressively stressed surface zone after ion exchanging which is at least 60 micrometers in depth can be formed from an alkali metal oxide silicate glass comprising by weight about 4 to about 15 percent sodium oxide, about 3 to about 15 percent potassium oxide provided the total amount of sodium, potassium and other alkali metal oxides is up to about 20 percent and about 3 to about 15 percent lanthanum oxide. The ion exchange process can take place at a temperature either above or below the strain point of conventional ophthalmic crown glass to produce satisfactory physical properties in the ophthalmic glass lens.

公开(公告)号：DE2639418A1

公开(公告)日：1977-03-31

申请号：DE2639418

申请日：1976-08-30

Applicant: AMERICAN OPTICAL CORP

Inventor： DEEG EMIL WOLFGANG ,  GRAF ROBERT EDMOND ,  KROHN DAVID ARNOLD ,  SOUTHBRIDGE MASS

IPC: G02B1/00 ,  A61F2/00 ,  A61F2/16 ,  A61L27/00 ,  A61L27/12 ,  C03C3/066 ,  C03C4/00 ,  C03C4/20 ,  C03C3/08 ,  C03C3/30 ,  G02C7/02

Abstract: A chemically durable, inert optical implant lens and glass composition for the manufacture of same.