US4379111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing chromium oxide coated refractory fibers
Assignee: Stemcor Corp
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Filing: 1981-07-06
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Granted: 1983-04-05
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Expires: 2001-07-06
Abstract
Abstract A ceramic fiber and a shrink resistant article manufactured therefrom. The fiber comprises at least 80 weight percent of a refractory compound selected from the group consisting of silica, alumina, aluminum silicate, titania, zirconia, zirconium silicate and mixtures thereof and which comprises less than 5 combined weight percent of alkali or alkaline metal oxide or alkali or alkaline metal silicate. The fiber is uniformly coated with from about 0.01 to about 5 weight percent of Cr 2 O 3 .
Inventors
- 👤 Russell D. Smith
- 👤 Richard E. Tressler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:40
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C03; C03C; C03C13/00; C03C13/006; C03C25/00; C03C25/10; C03C25/42; C04B20/00; C04B20/10; C04B20/1055; C04B35/00; C04B35/622; C04B35/62227; C04B35/62231; C04B41/45; C04B41/50; C04B41/5025; C04B41/5033; C04B41/80; C04B41/81; C04B41/85; C04B41/87; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2958; Y10T428/2964
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
67 words
A method for uniformly coating a ceramic fiber to increase the shrink resistance of the ceramic fiber comprising spraying a solution containing from about 0.1 to about 20 weight percent chromium ion upon the fiber at a fiber temperature of about 350° C. to the melting temperature of the fiber to form a fiber having increased shrink resistance, said spraying occurring during fiberization prior to initial cooling.
Claim 2
Independent Claim
67 words
A method for uniformly coating a ceramic fiber to increase the shrink resistance of the ceramic fiber comprising spraying a solution containing from about 0.1 to about 20 weight percent chromium ion upon the fiber at a fiber temperature of about 350° C. to the melting temperature of the fiber to form a fiber having increased shrink resistance, said spraying occurring during fiberization prior to initial cooling.
Claim 3
Dependent Claim
43 words
The method of claim 1 wherein the fiber is formed from a composition comprising at least 90 weight percent of a mixture of alumina and silica and the fiber temperature at the time of spraying is from about 1500° to about 1750° C.
Claim 4
Dependent Claim
25 words
The method of claim 2 wherein the fibers comprise from about 40 to 100 weight percent alumina and from 0 to 60 weight percent silica.
Claim 5
Dependent Claim
28 words
The method of claim 3 wherein the fibers comprise from about 45 to about 65 weight percent alumina and from about 35 to about 55 weight percent silica.
Claim 6
Dependent Claim
28 words
The method of claim 3 wherein the fibers comprise from about 45 to about 55 weight percent alumina and from about 45 to about 55 weight percent silica.
References Cited (Backward Citations)
US2763569A
Cited
GB969782A
Cited
US3348994A
Cited
US3416953A
Cited
GB1107877A
Cited
US3585260A
Cited
US3649406A
Cited
US3725117A
Cited
US3984591A
Cited
FR2229665A1
Cited
GB1481133A
Cited
DE2829413B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-04-04 | 1986-10-04 | 1987-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-04 | 1990-10-04 | 1991-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-04 | 1994-10-04 | 1995-04-05 | $7700.00 | Window Closed / Lapsed |