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Patent US4066465A successfully refreshed from Google Patents.
US4066465A
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US
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Alkali-resistant glass composition
Assignee: Central Glass Co Ltd
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Filing: 1976-10-04
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Granted: 1978-01-03
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Expires: 1996-10-04
Abstract
Abstract A glass composition particularly useful for producing alkali-resistant glass fibers, containing, by weight, from 53 to 63% SiO 2 , from 21 to 23% ZrO 2 and from 10 to 21% Na 2 O.
Inventors
- 👤 Yoshio Mohri
- 👤 Takashi Hiroishi
- 👤 Kinzi Sano
- 👤 Koichi Huruya
- 👤 Tadashi Muramoto
- 👤 Masato Tao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:08
CPC Classifications
C; C03; C03C; C03C13/00; C03C13/001; C03C13/002
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
120 words
An alkali-resistant glass fiber composed of a glass composition consisting of, by weight, ______________________________________
SiO.sub.2
53 to 63%
ZrO.sub.2
21 to 23%
R.sub.2 O
10 to 21%
R'O 0 to 5%
Al.sub.2 O.sub.3
0 to 5%
F.sub.2
0 to 1%
______________________________________ wherein R 2 O represents Na 2 O or a mixture of Na 2 O and at least one of up to 5% K 2 O and up to 3% Li 2 O; R'O represents an oxide of Group II metal selected from the group consisting of CaO, MgO, BaO and ZnO, the total amount of the SiO 2 , ZrO 2 and R 2 O components in said composition ranging from 92.5 weight percent to 98.5 weight percent.
Claim 2
Dependent Claim
120 words
An alkali-resistant glass fiber composed of a glass composition consisting of, by weight, ______________________________________
SiO.sub.2
53 to 63%
ZrO.sub.2
21 to 23%
R.sub.2 O
10 to 21%
R'O 0 to 5%
Al.sub.2 O.sub.3
0 to 5%
F.sub.2
0 to 1%
______________________________________ wherein R 2 O represents Na 2 O or a mixture of Na 2 O and at least one of up to 5% K 2 O and up to 3% Li 2 O; R'O represents an oxide of Group II metal selected from the group consisting of CaO, MgO, BaO and ZnO, the total amount of the SiO 2 , ZrO 2 and R 2 O components in said composition ranging from 92.5 weight percent to 98.5 weight percent.
Claim 3
Dependent Claim
43 words
An alkali-resistant glass fiber according to claim 1, wherein said glass composition consists of, by weight, ______________________________________
SiO.sub.2 56.1 to 61%
ZrO.sub.2 about 21%
Na.sub.2 O 16.5 to 21%
CaO 1 to 3%
Al.sub.2 O.sub.3 1 to 1.5%
F.sub.2 0 to 0.5%
______________________________________
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-02 | 1981-07-04 | 1982-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-02 | 1985-07-04 | 1986-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-02 | 1989-07-04 | 1990-01-03 | $7700.00 | Window Closed / Lapsed |