US4731348A
Expired / Lapsed
US
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Aluminosilicate optical glass
Assignee: Battelle Memorial Institute Inc
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Filing: 1985-03-04
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Granted: 1988-03-15
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Expires: 2005-03-04
Abstract
Abstract Optical glasses based on silica and alumina, rich in modifying metals such as silver, thallium and cesium. The exchange by cathodic migration in a melted salt bath of said modifying metals by metals such as K, Na and Li, exchange which leads to a corresponding variation of the refraction index of the glass according to a certain predetermined profile, is performed very efficiently and rapidly. Such an exchange is performed either on the finished glass or on a microporous form thereof.
Inventors
- 👤 Carlos Gonzales-Oliver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:10
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/083; C03C13/00; C03C13/04; C03C13/045; C03C13/046; C03C21/00; C03C21/001; C03C21/005; C03C23/00; Y; Y10; Y10S; Y10S65/00; Y10S65/901
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
93 words
An aluminosilicate optical glass without boron oxide, characterized in that it contains: (a) 60-95 mole % of silica; (b) at least 2 mole % of alumina; and (c) at least 2 mole % of a modifying metal component selected from the group consisting of (i) an oxide of silver, (ii) a mixture of an oxide of silver and an oxide of thallium, (iii) a mixture of a oxide of silver and an oxide of cesium, and (iv) a mixture of an oxide of silver, an oxide of thallium and an oxide of cesium.
Claim 2
Dependent Claim
93 words
An aluminosilicate optical glass without boron oxide, characterized in that it contains: (a) 60-95 mole % of silica; (b) at least 2 mole % of alumina; and (c) at least 2 mole % of a modifying metal component selected from the group consisting of (i) an oxide of silver, (ii) a mixture of an oxide of silver and an oxide of thallium, (iii) a mixture of a oxide of silver and an oxide of cesium, and (iv) a mixture of an oxide of silver, an oxide of thallium and an oxide of cesium.
Claim 3
Dependent Claim
28 words
Glass according to claim 1 characterised in that the proportion of alumina is 2 to 20 mole % and the proportion of modifying-metal oxides is 3-20 mole %.
Claim 4
Dependent Claim
39 words
The aluminosilicate optical glass according to claim 1, characterised in that it contains: (a) 60-95 mole % of silica; (b) at least 2 mole % of alumina; and (c) at least 2 mole % of an oxide of silver.
Claim 5
Dependent Claim
24 words
The optical glass of claim 1 wherein said modifying metal component is a mixture of an oxide of silver and an oxide of thallium.
Claim 6
Dependent Claim
24 words
The optical glass of claim 1 wherein said modifying metal component is a mixture of an oxide of silver and an oxide of cesium.
Claim 7
Dependent Claim
28 words
The optical glass of claim 1 wherein said modifying metal component is a mixture of an oxide of silver, an oxide of thallium and an oxide of cesium.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-15 | 1991-09-14 | 1992-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-15 | 1995-09-14 | 1996-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-15 | 1999-09-14 | 2000-03-15 | $7700.00 | Window Closed / Lapsed |