US3853569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicate glass fiber compositions
Assignee: Compagnie de Saint Gobain SA
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Filing: 1970-07-01
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Granted: 1974-12-10
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Expires: 1990-07-01
Abstract
Abstract Glass composition and method, particularly adapted for use in forming glass fibers by centrifugal spinning. The glass is characterized by about 61 to 66.5% by weight SiO2; 2 to 5% Al2O3; 0 to 1.5% F; 2 to 5% MgO; 1 to 5% B2O3; 0.1 to 2.75% BaO; 14 to 16% Na2O + K2O; 4 to 7.5% CaO; 0-2.5% ZrO2; 0.2 to 1% Fe2O3, such that 0.30 < CaO/Na2O + K2O < 0.50, and such that BaO/CaO < 0.50 and 0.5 < MgO/CaO < 0.7. The glass has a fibering temperature of from 960 DEG to 1,110 DEG C. and high resistance to devitrification at these temperatures, thus enabling operation at temperatures materially lower than prior art.
Inventors
- 👤 B Laurent
- 👤 C Haslay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:11
CPC Classifications
C; C03; C03C; C03C13/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
26 words
A GLASS HAVING THE COMPOSITION BY WEIGHT PERCENT: SIO2 63.90 FE2O3 0.30 AL2O3 2.95 CAO 7.35 MGO 3.10 BAO 2.50 NA2O 14.10 K2O 0.80 B2O3 5.00
Claim 2
Dependent Claim
26 words
A GLASS HAVING THE COMPOSITION BY WEIGHT PERCENT: SIO2 63.90 FE2O3 0.30 AL2O3 2.95 CAO 7.35 MGO 3.10 BAO 2.50 NA2O 14.10 K2O 0.80 B2O3 5.00
Claim 3
Dependent Claim
8 words
A glass having the composition by weight percent:
Claim 4
Dependent Claim
8 words
A glass having the composition by weight percent:
References Cited (Backward Citations)
US2998620A
Cited
US3013888A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |