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US3989532A
Expired / Lapsed
US
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Anti-misting inorganic oxide glass compositions
Assignee: Imperial Chemical Industries Ltd
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Filing: 1974-02-04
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Granted: 1976-11-02
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Expires: 1994-02-04
Abstract
Abstract An optical article, for example, a lens, window or mirror, at least part of the surface of which, and preferably the whole of which, is an inorganic oxide glass having a P2O5 content of at least 52 mole %, and preferably 55 to 68.5 mole %, an alkaline earth content of 2.7 to 20 mole %, and a transformation temperature of not greater than 300 DEG C, the glass optionally containing B2O3 and at least one alkali metal oxide.
Inventors
- 👤 Neil Hunter Ray
- 👤 William Derek Robinson
- 👤 Cyril John Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:33
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/16; C03C3/19; C03C3/21
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
60 words
An optical article at least part of the surface of which is an inorganic oxide glass having a P 2 O 5 content of at least 52 mole %, an alkaline earth oxide content of 2.7 to 20 mole %, said percentages based on 100% of the total composition, and a transformation temperature range of not greater than 300° C.
Claim 2
Dependent Claim
60 words
An optical article at least part of the surface of which is an inorganic oxide glass having a P 2 O 5 content of at least 52 mole %, an alkaline earth oxide content of 2.7 to 20 mole %, said percentages based on 100% of the total composition, and a transformation temperature range of not greater than 300° C.
Claim 3
Dependent Claim
19 words
An optical article the whole of the surface of which is an inorganic glass as defined in claim 1.
Claim 4
Dependent Claim
16 words
An optical article as claimed in claim 2 which is made of an inorganic oxide glass.
Claim 5
Dependent Claim
26 words
An optical article as claimed in claim 1 in which the inorganic oxide glass comprises at least 55 mole % of P 2 O 5 .
Claim 6
Dependent Claim
27 words
An optical article as claimed in claim 4 in which the inorganic oxide glass comprises from 55 to 68.5 mole % of P 2 O 5 .
Claim 7
Dependent Claim
27 words
An optical article as claimed in claim 5 in which the inorganic oxide glass comprises from 58 to 65 mole % of P 2 O 5 .
Claim 8
Dependent Claim
23 words
An optical article as claimed in claim 1 which contains B 2 O 3 in a proportion of 1.2 to 3.5 mole %.
Claim 9
Dependent Claim
27 words
An optical article as claimed in claim 1 in which the inorganic oxide glass comprises at least 5 mole % of at least one alkali metal oxide.
Claim 10
Dependent Claim
27 words
An optical article as claimed in claim 8 in which the inorganic oxide glass comprises at least 10 mole % of at least one alkali metal oxide.
Claim 11
Dependent Claim
30 words
An optical article as claimed in claim 8 in which in the inorganic oxide glass the alkali metal oxide is Li 2 O, Na 2 O, or a mixture thereof.
Claim 12
Dependent Claim
25 words
An optical article as claimed in claim 1 in which the inorganic oxide glass contains PbO in a proportion of 4 to 6 mole %.
Claim 13
Dependent Claim
25 words
An optical article as claimed in claim 1 in which the inorganic oxide glass comprises from 3.6 to 15 mole % of alkaline earth oxide.
Claim 14
Dependent Claim
25 words
An optical article as claimed in claim 12 in which the inorganic oxide glass comprises from 3.6 to 10 mole % of alkaline earth oxide.
Claim 15
Dependent Claim
24 words
An optical article as claimed in claim 1 in which the inorganic oxide glass has a refractive index in the range 1.51 to 1.53.
Claim 16
Dependent Claim
58 words
An optical article as claimed in claim 14 in which the inorganic oxide glass has a composition P 2 O 5 58 to 65 mole %, B 2 O 3 2 to 2.5 mole %, PbO 4 to 6 mole %, Na 2 O 12 to 20 mole %, the balance being Li 2 O, CaO and MgO.
Claim 17
Dependent Claim
25 words
An optical article as claimed in claim 1 in which the inorganic oxide glass has a transformation temperature in the range 190° to 300° C.
Claim 18
Dependent Claim
25 words
An optical article as claimed in claim 16 in which the inorganic oxide glass has a transformation temperature in the range 220° to 275° C.
Claim 19
Dependent Claim
25 words
An optical article which is a laminated structure at least an outer surface of which is an inorganic oxide glass. As claimed in claim 1.
Claim 20
Dependent Claim
26 words
An optical article as claimed in claim 1 which is capable of transmitting an optical image by a process involving transmission of light through said glass.
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) | 1979-11-02 | 1980-05-03 | 1980-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-02 | 1984-05-03 | 1984-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-02 | 1988-05-03 | 1988-11-02 | $7700.00 | Window Closed / Lapsed |