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 Title: |
US4537612:
Colored photochromic glasses and method
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Borrelli, Nicholas F.; Elmira, NY
Hares, George B.; Corning, NY
Smith, Dennis W.; Corning, NY
Wedding, Brent M.; Corning, NY
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| Assignee: |
Corning Glass Works, Corning, NY
other patents from CORNING INCORPORATED (123425) (approx. 3,659)
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| Published / Filed: |
1985-08-27
/ 1984-09-17
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| Application Number: |
US1984000650846
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| IPC Code: |
Advanced:
C03C 4/06;
C03C 21/00;
C03C 23/00;
Core:
C03C 4/00;
more...
IPC-7:
C03C 3/26;
C03C 21/00;
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| U.S. Class: |
Current:
065/030.11;
501/013;
Original:
065/030.11;
501/013;
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| Field of Search: |
065/30.11,32
501/013
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| Priority Number: |
| 1984-09-17 |
US1984000650846 |
| 1982-04-01 |
US1982000364472 |
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| Abstract: |
This invention is directed to a method for modifying the coloration produced in a silver halide-containing photochromic glass when heat treating the glass at a temperature not exceeding 450° C. under reducing conditions. The method comprises subjecting such a glass having a base composition which contains at least 1% by weight Li2 O, at least 2% by weight Na2 O, and at least 6% by weight Li2 O+Na2 O+K2 O to an ion exchange reaction, wherein lithium ions, and potassium ions, when the latter are present in the composition, in the glass surface are exchanged with sodium ions from an external source, prior to the reduction heat treatment.
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| Attorney, Agent or Firm: |
Janes, Jr., C. S. ;
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| Primary / Asst. Examiners: |
Schor, Kenneth M.;
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| INPADOC Legal Status: |
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