US4026714A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphate glass compositions
Assignee: Imperial Chemical Industries Ltd
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Filing: 1976-08-30
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Granted: 1977-05-31
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Expires: 1996-08-30
Abstract
Abstract A glass having a good combination of anti-misting properties and durability to water is produced from an inorganic glass composition comprising: A. P 2 O 5 -- 52 to 72 mole % B. one or more oxides selected from B 2 O 3 , SiO 2 and Al 2 O 3 -- in total more than 3.5 mole % and not more than 12 mole %. C. PbO -- 1 to 12 mole% and D. alkali metal oxides, alkaline earth metal oxides or zinc oxide -- in total 4 to 30 mole %.
Inventors
- 👤 Cyril John Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:52
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/07; C03C3/072; C03C17/00; C03C17/02; C03C3/064; C03C3/12; C03C3/16; C03C3/19
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
112 words
An inorganic oxide glass composition comprising P 2 o 5 -- 52 to 72 mole %, one or more oxides selected from B 2 O 3 , SiO 2 and Al 2 O 3 -- in total more than 3.5 mole % and not more than 12 mole %, PbO-- 1 to 12 mole %, alkali metal oxides, alkaline earth metal oxides or zinc oxide-- in total 4 to 30 mole %, there being present in the composition at least one alkali metal oxide and at least one oxide selected from alkaline earth metal oxides and zinc oxide, the composition having a transformation temperature in the range 180° C. to 400° C.
Claim 2
Dependent Claim
112 words
An inorganic oxide glass composition comprising P 2 o 5 -- 52 to 72 mole %, one or more oxides selected from B 2 O 3 , SiO 2 and Al 2 O 3 -- in total more than 3.5 mole % and not more than 12 mole %, PbO-- 1 to 12 mole %, alkali metal oxides, alkaline earth metal oxides or zinc oxide-- in total 4 to 30 mole %, there being present in the composition at least one alkali metal oxide and at least one oxide selected from alkaline earth metal oxides and zinc oxide, the composition having a transformation temperature in the range 180° C. to 400° C.
Claim 3
Dependent Claim
23 words
An inorganic oxide glass composition as claimed in claim 1 which contains at least 58 mole % of P 2 O 5 .
Claim 4
Dependent Claim
24 words
An inorganic oxide glass composition as claimed in claim 1 which contains not more than 68 mole % of P 2 O 5 .
Claim 5
Dependent Claim
27 words
An inorganic oxide glass composition as claimed in any one of claim 1 which contains from 4 to 10 mole % of B 2 O 3 .
Claim 6
Dependent Claim
27 words
An inorganic oxide glass composition as claimed in any one of claim 1 which contains not more than 6 mole % of Al 2 O 3 .
Claim 7
Dependent Claim
25 words
An inorganic oxide glass composition as claimed in any one of claim 1 which contains not more than 5 mole % of SiO 2 .
Claim 8
Dependent Claim
23 words
An inorganic oxide glass composition as claimed in any one of claim 1 which contains from 2 to 8 mole % of PbO.
Claim 9
Dependent Claim
27 words
An inorganic oxide glass composition as claimed in any one of claim 1 which contains at least 5 mole % of at least one alkali metal oxide.
Claim 10
Dependent Claim
34 words
An inorganic oxide glass composition as claimed in any one of claim 1 which contains at least 5 mole % of at least one oxide selected from alkaline earth metal oxides and zinc oxide.
Claim 11
Dependent Claim
34 words
An inorganic oxide glass composition as claimed in any one of claim 1 which contains not more than 20 mole % of oxide or oxides selected from alkaline earth metal oxides and zinc oxide.
Claim 12
Dependent Claim
22 words
An inorganic oxide glass composition as claimed in any one of claim 1 having a transformation temperature of less than 380° C.
Claim 13
Dependent Claim
22 words
An inorganic oxide glass composition as claimed in any one of claim 1 having a transformation temperature of greater than 250° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |