US4199336A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making basalt glass ceramic fibers
Assignee: Corning Glass Works
•
Filing: 1978-09-25
•
Granted: 1980-04-22
•
Expires: 1998-09-25
Abstract
Abstract Fine-grained, polycrystalline, basalt-type glass-ceramic fibers, having a crystal content of at least 35% and particular application as fiber reinforcement in concrete structures, are disclosed. A method of production comprises treating a vitreous fiber in the temperature range of 900° to 1250° C. for a time not exceeding ten minutes, and preferably less than one minute.
Inventors
- 👤 Hermann L. Rittler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:52
CPC Classifications
C; C03; C03C; C03C13/00; C03C13/001; C03B; C03B32/00; C03B32/02; C03B37/00; C03B37/01; C03B37/02; C03B37/10; C03B37/14; C03B37/15; C03C13/006; C03C13/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
86 words
A method of producing glass-ceramic fibers having a diameter not greater than about 250 microns and having a fine-grained, mixed magnetite-clinopyroxene crystal phase constituting at least 35% of said fiber which comprises, melting a raw material batch composed predominantly of a basalt-type material, forming vitreous fibers from such melt while simultaneously, forming magnetite nuclei in the glass fibers, and reheating said glass fibers to a temperature between 900°-1250° C. for a time not exceeding ten minutes to develop said mixed magnetite-clinopyroxene crystal phase on such nuclei.
Claim 2
Independent Claim
86 words
A method of producing glass-ceramic fibers having a diameter not greater than about 250 microns and having a fine-grained, mixed magnetite-clinopyroxene crystal phase constituting at least 35% of said fiber which comprises, melting a raw material batch composed predominantly of a basalt-type material, forming vitreous fibers from such melt while simultaneously, forming magnetite nuclei in the glass fibers, and reheating said glass fibers to a temperature between 900°-1250° C. for a time not exceeding ten minutes to develop said mixed magnetite-clinopyroxene crystal phase on such nuclei.
Claim 3
Dependent Claim
17 words
A method in accordance with claim 1 wherein the reheat treatment time is less than one minute.
Claim 4
Dependent Claim
14 words
A method in accordance with claim 1 wherein the temperature range is 1000°-1100° C.
Claim 5
Dependent Claim
21 words
The method of claim 1 wherein the basalt-type material is a tholeiitic basalt having an R 2 O content below 5%.
Claim 6
Dependent Claim
24 words
The method of claim 1 wherein the batch is maintained mildly oxidizing by adding ammonium nitrate (NH 4 NO 3 ) to the batch.
References Cited (Backward Citations)
US3679443A
Cited
US3557575A
Cited
US3650721A
Cited
US3873328A
Cited
US3881945A
Cited
US3929497A
Cited
US3901676A
Cited
US4008094A
Cited
US4009015A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-22 | 1983-10-22 | 1984-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-22 | 1987-10-22 | 1988-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-22 | 1991-10-22 | 1992-04-22 | $7700.00 | Window Closed / Lapsed |