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US4054472A
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Alkali-resistant compositions for forming glass fibers
Assignee: Fuji Fiber Glass Co Ltd
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Filing: 1976-05-19
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Granted: 1977-10-18
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Expires: 1996-05-19
Abstract
Abstract Alkali-resistant compositions for forming glass fibers characterized by comprising, in molecular weight percentage, 58-77% of SiO 2 , 4-11% of ZrO 2 , 16-24% of an alkali metal oxide and 0.5-3.5% of at least one oxide selected from the group consisting of oxides of iron and oxides of copper, with the proviso that the molecular weight percentages of the oxides of iron and the oxides of copper are calculated in terms of the chemical formulas Fe 2 O 3 and CuO, respectively. Alkali-resistant compositions for forming glass fibers characterized by comprising in molecular weight percentage, 56-74% of SiO 2 , 4-6.9% of ZrO 2 , 11-20% of an alkali metal oxide, 0.5-3.5% of at least one oxide selected from the group consisting of oxides of iron and oxides of copper with the proviso that the molecular weight percentages of the oxides of iron and the oxides of copper are calculated in terms of the chemical formulas Fe 2 O 3 and CuO, respectively, and up to 12% of an alkaline earth metal oxide.
Inventors
- 👤 Masahiro Kondo
- 👤 Suguru Takehara
- 👤 Tsutomu Mitsufuji
- 👤 Moritosi Sasaki
- 👤 Tomoji Takura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:01
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/083; C03C13/00; C03C13/001; C03C13/002
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
87 words
An alkali-resistant composition for forming glass fibers consisting essentially of, by molecular weight percentage, 58-77% of SiO 2 , 4-11% of ZrO 2 , 16-24% of at least one of alkali metal oxides and 0.5-3.5% of at least one oxide selected from the group consisting of an oxide of iron and an oxide of copper, with the proviso that the molecular weight percentages of the oxide of iron and oxide of copper are calculated in terms of the chemical formulas Fe 2 O 3 and CuO, respectively.
Claim 2
Dependent Claim
87 words
An alkali-resistant composition for forming glass fibers consisting essentially of, by molecular weight percentage, 58-77% of SiO 2 , 4-11% of ZrO 2 , 16-24% of at least one of alkali metal oxides and 0.5-3.5% of at least one oxide selected from the group consisting of an oxide of iron and an oxide of copper, with the proviso that the molecular weight percentages of the oxide of iron and oxide of copper are calculated in terms of the chemical formulas Fe 2 O 3 and CuO, respectively.
Claim 3
Dependent Claim
57 words
An alkali-resistant composition according to claim 1, which consists essentially of, by molecular weight percentage, 63-75% of SiO 2 , 6-10% of ZrO 2 , 17-22% of at least one of alkali metal oxides and 1-3 % of at least one oxide selected from the group consisting of an oxide of iron and an oxide of copper.
Claim 4
Dependent Claim
15 words
An alkali-resistant composition according to claim 1 wherein said alkali metal oxide is sodium oxide.
Claim 5
Dependent Claim
37 words
An alkali-resistant composition according to claim 1, which consists essentially of, by molecular weight percentage, 68-70% of SiO 2 , 8-10% of ZrO 2 , 19-21% of Na 2 O, and 1-3% of an oxide of iron.
Claim 6
Dependent Claim
44 words
An alkali-resistant composition according to claim 1, which consists essentially of, by molecular weight percentage, 68-70% of SiO 2 , 8-10% of ZrO 2 , 19-21% of Na 2 O, 1-2% of an oxide of iron and 0.1 -0.6% of an oxide of copper.
Claim 7
Dependent Claim
99 words
An alkali-resistant composition for forming glass fibers consisting essentially of, by molecular weight percentage, 56-74% of SiO 2 , 4-6.9% of ZrO 2 , 11-20% of at least one of alkali metal oxides, 0.5-3.5% of at least one oxide selected from the group consisting of an oxide of iron and an oxide of copper, with the proviso that the molecular weight percentages of the oxide of iron and the oxide of copper are calculated in terms of the chemical formulas Fe 2 O 3 and CuO, respectively, and up to 12% of at least one alkaline earth metal oxide.
Claim 8
Dependent Claim
99 words
An alkali-resistant composition for forming glass fibers consisting essentially of, by molecular weight percentage, 56-74% of SiO 2 , 4-6.9% of ZrO 2 , 11-20% of at least one of alkali metal oxides, 0.5-3.5% of at least one oxide selected from the group consisting of an oxide of iron and an oxide of copper, with the proviso that the molecular weight percentages of the oxide of iron and the oxide of copper are calculated in terms of the chemical formulas Fe 2 O 3 and CuO, respectively, and up to 12% of at least one alkaline earth metal oxide.
Claim 9
Dependent Claim
66 words
An alkali-resistant composition according to claim 6, which consists essentially of, by molecular weight percentage, 61-72% of SiO 2 5.5-6.5% of ZrO 2 , 13-18% of at least one of alkali metal oxides, 1-3% of at least one oxide selected from the group consisting of an oxide of iron and an oxide of copper, and up to 8% of at least one alkaline earth metal oxide.
Claim 10
Dependent Claim
15 words
An alkali-resistant composition according to claim 6 wherein said alkali metal oxide is sodium oxide.
Claim 11
Dependent Claim
14 words
An alkali-resistant composition according to claim 6, wherein said alkaline earth metal is CaO.
Claim 12
Dependent Claim
40 words
An alkali-resistant composition according to claim 6, which consists essentially of, by molecular weight percentage, 68-70% of SiO 2 , 5.5-6.5% of ZrO 2 , 15-17% of Na 2 O, 1-3% of an oxide of iron and 6-8% of CaO.
Claim 13
Dependent Claim
33 words
An alkali-resistant composition according to claim 6, which consists essentially of, by molecular weight percentage, 68-70% of SiO 2 , 5.5-6.5% of ZrO 2 , an oxide of copper and 6-8% of CaO.
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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) | 1980-10-17 | 1981-04-18 | 1981-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-17 | 1985-04-18 | 1985-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-17 | 1989-04-18 | 1989-10-18 | $7700.00 | Window Closed / Lapsed |