US3917488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High elastic modulus borate glass
Assignee: Corning Glass Works
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Filing: 1974-04-29
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Granted: 1975-11-04
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Expires: 1994-04-29
Abstract
Abstract This invention relates to the manufacture of fibers from essentially silica-free glasses in the ternary system B2O3-Al2O3MgO which exhibit elastic moduli in excess of 13 X 106 psi. The inclusion of such high field strength modifiers as TiO2, Ta2O5, La2O3, CeO2, ZrO2, Y2O3, and BeO can increase the elastic moduli to values above 19 X 106 psi.
Inventors
- 👤 Joseph W Malmendier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:11
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/14; C03C3/15; C03C3/155; C03C13/00; C03C3/145
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
32 words
A glass fiber exhibiting an elastic modulus in excess of 13 X 106 psi consisting essentially, by weight on the oxide basis, of a composition within area ABC of the appended drawing.
Claim 2
Dependent Claim
32 words
A glass fiber exhibiting an elastic modulus in excess of 13 X 106 psi consisting essentially, by weight on the oxide basis, of a composition within area ABC of the appended drawing.
Claim 3
Dependent Claim
105 words
A GLASS FIBER EXHIBITING AN ELASTIC MODULUS IN EXCESS OF 13 ) X 10**6 PSI CONSISTING ESSENTIALLY, BY WEIGHT ON THE OXIDE BASIS, OF ABOUT 7-26% MGO, 10-45% AI2O2, 20-45% B2O2, AND UP TO 50 PERCENT TOTAL OF AT LEAST ONE HIGH FIELD STRENGTH MODIFIER IN THE INDICATED PROPORTION SELECTED FROM THE GROUP CONSISTING OF 0-10% TIO2, O-40% TA2O5, O-50% LA2O2, 0-25% CEO2, 0-10% ZRO2, 0-35% Y2O3, AND 0-15% BEO, THE TOTAL OF MGO + BEO NOT EXCEEDING ABOUT 26 PERCENT, SAID GLASS BEING ESSENTIALLY FREE FROM SIO2,P2O5, THE ALKALI METAL OXIDES OTHER THAN THE LI2O, AND THE ALKALINE EARTH METAL OXIDES OTHER THAN MGO.
Claim 4
Dependent Claim
105 words
A GLASS FIBER EXHIBITING AN ELASTIC MODULUS IN EXCESS OF 13 ) X 10**6 PSI CONSISTING ESSENTIALLY, BY WEIGHT ON THE OXIDE BASIS, OF ABOUT 7-26% MGO, 10-45% AI2O2, 20-45% B2O2, AND UP TO 50 PERCENT TOTAL OF AT LEAST ONE HIGH FIELD STRENGTH MODIFIER IN THE INDICATED PROPORTION SELECTED FROM THE GROUP CONSISTING OF 0-10% TIO2, O-40% TA2O5, O-50% LA2O2, 0-25% CEO2, 0-10% ZRO2, 0-35% Y2O3, AND 0-15% BEO, THE TOTAL OF MGO + BEO NOT EXCEEDING ABOUT 26 PERCENT, SAID GLASS BEING ESSENTIALLY FREE FROM SIO2,P2O5, THE ALKALI METAL OXIDES OTHER THAN THE LI2O, AND THE ALKALINE EARTH METAL OXIDES OTHER THAN MGO.
Claim 5
Dependent Claim
35 words
A glass fiber according to claim 2 consisting essentially, by weight on the oxide basis, of about 8-20% MgO, 10-45% Al2O3, 20-40% B2O3, and at least 5 percent total of said high field strength modifiers.
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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) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |