US3901676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for crystallization of a fiber while stretching
Assignee: Bayer AG
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Filing: 1974-02-11
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Granted: 1975-08-26
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Expires: 1994-02-11
Abstract
Abstract Glass-ceramic fibers having a modulus of elasticity of more than 8,800 kp/mm2 are obtained by heating an amorphous glass fiber to a temperature at which crystallization occurs while stretching the fiber at least about 10%. The fiber may be first heated to produce seed crystals followed by increasing the temperature for ceramitization.
Inventors
- 👤 Gerhard Heinze
- 👤 Manfred Schon
- 👤 Friedrich Schwochow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:20
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/10; C03B37/14; C03B37/15; C03B27/00; C03B27/012; C03B32/00; C03B32/02; C03C; C03C13/00; C03C13/006
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
36 words
A PROCESS FOR THE PRODUCTION OF A GLASS FIBER OF IMPROVED MODULUS OF ELASTICITY COMPRISING HEATING THE FIBER TO A TEMPERTURE AT WHICH CRYSTALLIZATION OCCURS WHILE STRETCHING THE FIBER AT LEAST ABOUT 10% OF ITS LENGTH.
Claim 2
Dependent Claim
36 words
A PROCESS FOR THE PRODUCTION OF A GLASS FIBER OF IMPROVED MODULUS OF ELASTICITY COMPRISING HEATING THE FIBER TO A TEMPERTURE AT WHICH CRYSTALLIZATION OCCURS WHILE STRETCHING THE FIBER AT LEAST ABOUT 10% OF ITS LENGTH.
Claim 3
Dependent Claim
36 words
A process according to claim 1 wherein the fiber prior to crystallization is heated to a temperature of at least about 400*C to produce crystal seeds and is thereafter heated to a higher temperature for crystallization.
Claim 4
Dependent Claim
27 words
A process according to claim 2 wherein heating to produce seed crystals is effected at about 400*to 600*C and crystallization is effected at about 600* to 1000*C.
Claim 5
Dependent Claim
13 words
A process according to claim 1 wherein the fiber approximately comprises by weight
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) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |