US4008094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High durability, reinforcing fibers for cementitious materials
Assignee: Corning Glass Works
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Filing: 1975-07-16
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Granted: 1977-02-15
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Expires: 1995-07-16
Abstract
Abstract This invention relates to the production of vitreous fibrous materials exhibiting excellent resistance to alkaline attack. More particularly, the instant invention is directed to the production of fibers consisting essentially of basalt and zirconia which demonstrate such exceptional resistance to attack from the basic components present in such calcareous cementitious materials as portland cement as to render them especially useful as reinforcing elements in cementitious materials.
Inventors
- 👤 George H. Beall
- 👤 Hermann L. Rittler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:40
CPC Classifications
C; C03; C03C; C03C13/00; C03C13/001; C03C13/002; C03C13/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
34 words
Fibers demonstrating exceptional resistance to attack by alkaline solutions composed of a glass consisting essentially, by weight, of 85-99% tholeiitic basalt containing less than about 5% alkali metal oxides and 1-15% ZrO 2 .
Claim 2
Dependent Claim
34 words
Fibers demonstrating exceptional resistance to attack by alkaline solutions composed of a glass consisting essentially, by weight, of 85-99% tholeiitic basalt containing less than about 5% alkali metal oxides and 1-15% ZrO 2 .
Claim 3
Dependent Claim
20 words
Fibers according to claim 1 wherein the interior of said glass contains magnetic crystals but the surface thereof is amorphous.
Claim 4
Dependent Claim
20 words
Fibers according to claim 2 wherein said crystals are magnetite and/or ulvospinel and/or a solid solution between magnetite and ulvospinel.
Claim 5
Dependent Claim
54 words
In the reinforcing of calcareous cementitious materials through the inclusion of fibers therein, the improvement comprising utilizing glass fibers exhibiting exceptional resistance to the aqueous solution present in the cementitious mass, said glass consisting essentially, by weight, of 85-99% tholeiitic basalt containing less than about 5% alkali metal oxides and 1-15% ZrO 2 .
Claim 6
Dependent Claim
54 words
In the reinforcing of calcareous cementitious materials through the inclusion of fibers therein, the improvement comprising utilizing glass fibers exhibiting exceptional resistance to the aqueous solution present in the cementitious mass, said glass consisting essentially, by weight, of 85-99% tholeiitic basalt containing less than about 5% alkali metal oxides and 1-15% ZrO 2 .
Claim 7
Dependent Claim
27 words
In the reinforcing of calcareous cementitious materials according to claim 4 wherein the interior of said glass fibers contains magnetic crystals but the surface thereof is amorphous.
Claim 8
Dependent Claim
25 words
In the reinforcing of calcareous cementitious materials according to claim 5 wherein said crystals are magnetite and/or ulvospinel and/or solid solution between magnetite and ulvospinel.
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) | 1980-02-15 | 1980-08-16 | 1981-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-15 | 1984-08-16 | 1985-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-15 | 1988-08-16 | 1989-02-15 | $7700.00 | Window Closed / Lapsed |