Patent US3630766A successfully refreshed from Google Patents.
US3630766A
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Refractory fibers and method of producing same
Assignee: Unifrax I LLC
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Filing: 1969-11-25
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Granted: 1971-12-28
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Expires: 1989-11-25
Abstract
Abstract Boron nitride fibers having a maximum diameter of about 10 microns are heated at a temperature of at least about 1,100* C. in a gaseous atmosphere consisting essentially of hydrogen and a halide of a transition metal selected from the group consisting of titanium, niobium, zirconium, tantalum and hafnium. The fibers are thereby converted to refractory fibers which consist essentially of the corresponding transition metal nitride and from about 2 percent to about 10 percent boron.
Inventors
- 👤 James Economy
- 👤 Vlado I Matkovich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:29
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/62227; C04B35/62272; C04B35/62286; C04B35/6229; C22; C22C; C22C49/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
13 words
A refractory fiber as defined in claim 1 wherein said metal is titanium.
Claim 2
Dependent Claim
13 words
A refractory fiber as defined in claim 1 wherein said metal is niobium.
Claim 3
Dependent Claim
13 words
A refractory fiber as defined in claim 1 wherein said metal is zirconium.
Claim 4
Dependent Claim
13 words
A refractory fiber as defined in claim 1 wherein said metal is tantalum.
Claim 5
Dependent Claim
13 words
A refractory fiber as defined in claim 1 wherein said metal is hafnium.
Claim 6
Dependent Claim
82 words
A process for the production of a refractory fiber as defined in claim 1 comprising heating a fiber which has a maximum diameter of about 10 microns and which consists essentially of boron nitride at a temperature of at least about 1,100* C. in a gaseous atmosphere consisting essentially of hydrogen and a transition metal chloride selected from the group consisting of titanium tetrachloride, niobium pentachloride, zirconium tetrachloride, tantalum pentachloride and hafnium tetrachloride for a time sufficient to produce said refractory fiber.
Claim 7
Dependent Claim
15 words
A process as set forth in claim 7 wherein said metal chloride is titanium tetrachloride.
Claim 8
Dependent Claim
15 words
A process as set forth in claim 7 wherein said metal chloride is niobium pentachloride.
Claim 9
Dependent Claim
15 words
A process as set forth in claim 7 wherein said metal chloride is zirconium tetrachloride.
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) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |