Patent US3847626A successfully refreshed from Google Patents.
US3847626A
Expired / Lapsed
US
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Glass compositions, fibers and methods of making same
Assignee: Owens Corning
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Filing: 1973-03-19
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Granted: 1974-11-12
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Expires: 1993-03-19
Abstract
Abstract This disclosure relates to fiberizable glass compositions, fibers and the method of making textile glass fibers which are boron and fluorine free. Boron and fluorine have now been recognized as potential pollutants in the manufacture of fiberizable glasses and glass fibers and the following disclosure eliminates these pollutants by substituting TiO2 and MgO in the basic three component glass composition of SiO2, Al2O3 and CaO. The preferred glass composition consists essentially of, by weight, 54.5 to 60% SiO2, 9 to 14.5% Al2O3, 17 to 24% CaO, 3 to 5% TiO2 and 1.5 to 4.5% MgO.
Inventors
- 👤 T Erickson
- 👤 W Wolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:54
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/083; C03C3/085; C03C3/087; C03C13/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
60 words
A BORON AND FLUORINE FREE FIBERIZABLE GLASS, CONSISTING ESSENTIALLY OF, BY WEIGHT, 54.5 TO 60 PERCENT SIO2, 9 TO 14.5 PERCENT AL2O3, 17 TO 24 PERCENT CAO, 3 TO 5 PERCENT TIO2 AND 1.5 TO 4.5 PERCENT MGO AND HAVIG A LIQUIDUS TEMPERATURE OF ABOUT 2,200*F. OR LESS AND HAVING A VISCOSITY OF LOG 2.5 POISES AT 2,450*F. OR LESS.
Claim 2
Dependent Claim
60 words
A BORON AND FLUORINE FREE FIBERIZABLE GLASS, CONSISTING ESSENTIALLY OF, BY WEIGHT, 54.5 TO 60 PERCENT SIO2, 9 TO 14.5 PERCENT AL2O3, 17 TO 24 PERCENT CAO, 3 TO 5 PERCENT TIO2 AND 1.5 TO 4.5 PERCENT MGO AND HAVIG A LIQUIDUS TEMPERATURE OF ABOUT 2,200*F. OR LESS AND HAVING A VISCOSITY OF LOG 2.5 POISES AT 2,450*F. OR LESS.
Claim 3
Dependent Claim
34 words
The glass composition defined in claim 1, characterized in that said glass composition includes less than one percent, by weight, of Na2O, K2O and Li2O, total, calculated as Na2O in equivalent molecular weight percent.
Claim 4
Independent Claim
76 words
The method of making a fiberizable glass composition having a liquidus temperature of 2,200*F. or less and a viscosity of log 2.5 poises at 2,450*F. or less from a glass batch consisting essentially of SiO2, Al2O3 and CaO, by adding to the batch 3 to 5 percent by weight TiO2 and 1.5 to 4.5 percent by weight MgO, melting the glass composition and reducing the temperature of the molten glass to within the fiberization temperature range.
Claim 5
Independent Claim
76 words
The method of making a fiberizable glass composition having a liquidus temperature of 2,200*F. or less and a viscosity of log 2.5 poises at 2,450*F. or less from a glass batch consisting essentially of SiO2, Al2O3 and CaO, by adding to the batch 3 to 5 percent by weight TiO2 and 1.5 to 4.5 percent by weight MgO, melting the glass composition and reducing the temperature of the molten glass to within the fiberization temperature range.
Claim 6
Dependent Claim
64 words
The method of making a fiberizable glass composition defined in claim 4, wherein the three component composition consists essentially of from 54.5 to 60 percent SiO2, 9 to 14.5 percent Al2O3, 17 to 24 percent CaO, 3 to 5 percent TiO2, 1.5 to 4.5 percent MgO and less than 1 percent, total, Na2O, K2O and Li2O, calculated as Na2O in equivalent molecular weight percent.
Claim 7
Dependent Claim
56 words
A boron and fluorine free textile glass fiber, consisting essentially by weight of 54.5 to 60 percent SiO2, 9 to 14.5 percent Al2O3, 17 to 24 percent CaO, 3 to 5 percent TiO2, 1.5 to 4.5 percent MgO and less than 1 percent, total, Na2O, K2O and Li2O, calculated as Na2O in equivalent molecular weight percent.
Claim 8
Dependent Claim
56 words
A boron and fluorine free textile glass fiber, consisting essentially by weight of 54.5 to 60 percent SiO2, 9 to 14.5 percent Al2O3, 17 to 24 percent CaO, 3 to 5 percent TiO2, 1.5 to 4.5 percent MgO and less than 1 percent, total, Na2O, K2O and Li2O, calculated as Na2O in equivalent molecular weight percent.
Claim 9
Dependent Claim
25 words
A boron and fluorine free textile glass fiber having less than 1 percent by weight, total, alkali metal oxides, calculated as Na2O, consisting essentially of:
Claim 10
Dependent Claim
25 words
A boron and fluorine free textile glass fiber having less than 1 percent by weight, total, alkali metal oxides, calculated as Na2O, consisting essentially of:
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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) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |