US3811901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-toxic invert analog glass compositions of high modulus
Assignee: United States, AS REPRESENTED BY NATIONAL AERONAUTICS AND SPACE ADMINISTRATON
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Filing: 1972-04-21
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Granted: 1974-05-21
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Expires: 1992-04-21
Abstract
Abstract Glass compositions having a Young''s modulus of at least 15 million psi and a specific modulus of at least 110 million inches consisting essentially of, in mols, 15-40% SiO2, 6-15% Li2O, 2445 percent of at least two bivalent oxides selected from the group consisting of Ca, ZnO, MgO and CuO; 13-39 percent of at least two trivalent oxides selected from the group consisting of Al2O3, Fe2O3, B2O3, La2O3, and Y2O3 and up to 15 percent of one or more tetravalent oxides selected from the group consisting of ZrO2, TiO2 and CeO2.
Inventors
- 👤 J Bacon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:17
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/064; C03C13/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
49 words
A fiberizable glass composition having a Young''s modulus of at least 17 million psi and a specific modulus of at least 140 million inches consisting essentially of about, in mols: 25% SiO2; 5% Li2O; 20% MgO; 9% CaO; 2% CuO; 8% Al2O3; 14% B2O3; 14% Y2O3 and 3% TiO2.
Claim 2
Dependent Claim
23 words
The glass composition of claim 2 wherein said CaO content is 6 percent and Fe2O3 is present in an amount of 3 percent.
Claim 3
Dependent Claim
49 words
A fiberizable glass composition having a Young''s modulus of at least 17 million psi and a specific modulus of at least 140 million inches consisting essentially of about, in mols: 25% SiO2; 6% Li2O; 20% MgO; 15% CaO, 4% ZnO; 2% CuO; 13% B2O3; 12% Y2O3 and 3% TiO2.
Claim 4
Dependent Claim
44 words
A fiberizable glass composition having a Young''s modulus of at least 16 million psi and a specific modulus of at least 140 million inches consisting essentially of about, in mols: 25% SiO2; 15% Li2O; 15% MgO; 15% CaO; 10% ZnO; 15% B2O3; 5% Y2O3.
Claim 5
Dependent Claim
47 words
A glass composition having a Young''s modulus of at least 20 million psi and a specific modulus of approximately 200 million inches consisting essentially of about, in mols: 24% SiO2; 12% Li2O; 16% MgO; 12% CaO; 8% ZnO; 3% Al2O3; 10% B2O3; 12% ZrO2 and 3% TiO2.
Claim 6
Dependent Claim
43 words
A glass composition having a Young''s modulus of at least 20 million psi and a specific modulus of approximately 189 million inches consisting essentially of about, in mols: 22% SiO2; 11% Li2O; 22% MgO; 11% ZnO; 11% Al2O3; 12% Y2O3 and 11% ZrO2.
Claim 7
Dependent Claim
43 words
A glass composition having a Young''s modulus of at least 20 million psi and a specific modulus of approximately 159 million inches consisting essentially of about, in mols: 25% SiO2; 15% Li2O; 15% MgO; 15% CaO, 15% ZnO; 8% Al2O3 and 7% Y2O3.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |