US4118239A
Expired / Lapsed
US
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Alkali-resistant glass fiber composition
Assignee: Johns Manville Corp
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Filing: 1977-09-06
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Granted: 1978-10-03
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Expires: 1997-09-06
Abstract
Abstract An alkali-resistant fiberizable glass composition is disclosed, comprising, in parts by weight, SiO 2 , 50-60 parts; Al 2 O 3 , 1-11 parts; ZrO 2 , 4-10 parts; ZnO, 0.5-7 parts; at least one Group IA oxide, 10-19 parts; and at least one Group IIA oxide, 3-15 parts. Glass fiber of this composition is also disclosed, as is a Portland cement matrix reinforced with a plurality of such fibers.
Inventors
- 👤 Lawrence Vincent Gagin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:03
CPC Classifications
C; C03; C03C; C03C13/00; C03C13/001; C03C13/002; C03C3/00; C03C3/04; C03C3/076; C03C3/083; C03C3/085
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
46 words
An alkali-resistant glass composition capable of being fiberized, which consists of, in a total of 100 parts by weight. ______________________________________
SiO.sub.2 50-62 parts
Al.sub.2 O.sub.3 1-11 parts
ZrO.sub.2 4-10 parts
ZnO 0.5-7 parts
Group IA metal oxide 10-19 parts
Group IIA metal oxide 3-15 parts
______________________________________
Claim 2
Dependent Claim
46 words
An alkali-resistant glass composition capable of being fiberized, which consists of, in a total of 100 parts by weight. ______________________________________
SiO.sub.2 50-62 parts
Al.sub.2 O.sub.3 1-11 parts
ZrO.sub.2 4-10 parts
ZnO 0.5-7 parts
Group IA metal oxide 10-19 parts
Group IIA metal oxide 3-15 parts
______________________________________
Claim 3
Dependent Claim
7 words
Fluorine calculated as calcium fluoride 1-4 parts.
Claim 4
Dependent Claim
7 words
Fluorine calculated as calcium fluoride 1-4 parts.
Claim 5
Dependent Claim
17 words
A glass composition as in claim 1 also consisting of 3-8 parts by weight of boron oxide.
Claim 6
Dependent Claim
46 words
A glass composition as in claim 1 which consists of, in parts by weight: ______________________________________
SiO.sub.2 61.2 parts
Al.sub.2 O.sub.3
5.3 parts
ZrO.sub.2 8.5 parts
ZnO 2.8 parts
CaO 5.1 parts
MgO 0.1 parts
Na.sub.2 O 14.7 parts
K.sub.2 O 1.0 parts
CaF.sub.2 1.5 parts
______________________________________
Claim 7
Dependent Claim
10 words
Glass fiber formed of a composition as in claim 1.
Claim 8
Dependent Claim
10 words
Glass fiber formed of a composition as in claim 3.
Claim 9
Dependent Claim
17 words
A Portland cement matrix reinforced by a plurality of fibers having a composition as in claim 1.
Claim 10
Dependent Claim
17 words
A Portland cement matrix reinforced by a plurality of fibers having a composition as in claim 3.
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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) | 1981-10-02 | 1982-04-03 | 1982-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-02 | 1986-04-03 | 1986-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-02 | 1990-04-03 | 1990-10-03 | $7700.00 | Window Closed / Lapsed |