US3785836A
Expired / Lapsed
US
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High modulus invert analog glass compositions containing beryllia
Assignee: United States, AS REPRESENTED BY NATIONAL AERONAUTICS AND SPACE ADMINISTRATON
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Filing: 1972-04-21
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Granted: 1974-01-15
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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, 10-45% SiO2, 2-15% Li2O, 334% BeO, 12-36% of at least one bivalent oxide selected from the group consisting of CaO, ZnO, MgO and CuO, 10-39% of at least one trivalent oxide selected from the group consisting of Al2O3, B2O3, La2O3, Y2O3, Fe2O3 and the mixed rare earth oxides, the total number of said bivalent and trivalent oxides being at least three, and up to 10% of a tetravalent oxide 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
2026-10-31 23:30
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/064; C03C3/066; C03C13/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
42 words
A fiberizable glass composition having a Young''s modulus of at least 19 million psi and a specific modulus of at least 160 million inches consisting essentially of, in mols: 42-45% SiO2; 3% Li2O; 15-18% BeO; 12-15% MgO; 12-15% Al2O3 and 7-10% Y2O3.
Claim 2
Dependent Claim
45 words
A fiberizable glass composition having a Young''s modulus of at least 19 million psi and a specific modulus of at least 160 million inches consisting essentially of about, in mols: 42% SiO2; 3% Li2O; 15% BeO; 3% ZnO; 15% MgO; 12% Al2O3 and 10% 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) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |