US4312911A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromium oxide coated refractory fibers
Assignee: CARDBORUNDUM COMPANY
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Filing: 1979-12-19
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Granted: 1982-01-26
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Expires: 1999-12-19
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
2026-10-29 21:18
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/80; C04B41/81; C04B41/85; C04B41/87; 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; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2958; Y10T428/2964; Y10T442/00; Y10T442/60; Y10T442/603; Y10T442/605; Y10T442/69; Y10T442/691; Y10T442/692; Y10T442/696
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
50 words
A shrink resistant ceramic fiber article comprising ceramic fibers consisting essentially of from about 45 to 65 weight percent aluminum oxide and from about 35 to 55 weight percent silica said fibers being uniformly coated with from about 0.01 to about 5 weight percent of Cr 2 O 3 .
Claim 2
Dependent Claim
50 words
A shrink resistant ceramic fiber article comprising ceramic fibers consisting essentially of from about 45 to 65 weight percent aluminum oxide and from about 35 to 55 weight percent silica said fibers being uniformly coated with from about 0.01 to about 5 weight percent of Cr 2 O 3 .
Claim 3
Dependent Claim
18 words
The article of claim 1 wherein the fibers are microcrystalline fibers and the article is a fiber mat.
Claim 4
Dependent Claim
29 words
The mat of claim 2 wherein the fibers are treated by heating them to between about 1150° and about 1350° C. for from about 10 to about 1 minutes.
Claim 5
Dependent Claim
45 words
A ceramic fiber which consists essentially of from about 45 to 65 weight percent aluminum oxide and from about 35 to 55 weight percent silica, said fiber being uniformly coated with from about 0.01 to about 5 weight percent of Cr 2 O 3 .
Claim 6
Dependent Claim
45 words
A ceramic fiber which consists essentially of from about 45 to 65 weight percent aluminum oxide and from about 35 to 55 weight percent silica, said fiber being uniformly coated with from about 0.01 to about 5 weight percent of Cr 2 O 3 .
Claim 7
Dependent Claim
12 words
The fiber of claim 4 wherein said fiber is a microcrystalline fiber.
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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) | 1985-01-25 | 1985-07-27 | 1986-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-25 | 1989-07-27 | 1990-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-25 | 1993-07-27 | 1994-01-26 | $7700.00 | Window Closed / Lapsed |