US3716332A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbonization of wool
Assignee: Goodrich Corp
•
Filing: 1970-07-27
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Granted: 1973-02-13
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Expires: 1990-07-27
Abstract
Abstract A fibrous carbon product is produced by subjecting a body of wool fibers in a furnace to a reduced pressure to remove essentially all of the oxygen from the furnace and thereafter heating said body of wool fibers at a reduced pressure in the absence of any appreciable oxygen to a temperature of at least about 800*F at which carbonization will occur. An inert gas such as nitrogen is preferably passed over the body during carbonization to remove reaction products.
Inventors
- 👤 D Leeds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:10
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/18; Y; Y10; Y10S; Y10S264/00; Y10S264/19
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
82 words
A process of forming a carbonized body, including: a. subjecting a body of wool fibers in a furnace to a reduced pressure to remove essentially all of the oxygen from the furnace; b. heating said body of wool fibers in an inert atmosphere at a reduced pressure in the absence of any appreciable oxygen through the temperature range of 375* to 800* F. at a rate dependent upon the density of said body and to a temperature at which carbonization will occur.
Claim 2
Dependent Claim
82 words
A process of forming a carbonized body, including: a. subjecting a body of wool fibers in a furnace to a reduced pressure to remove essentially all of the oxygen from the furnace; b. heating said body of wool fibers in an inert atmosphere at a reduced pressure in the absence of any appreciable oxygen through the temperature range of 375* to 800* F. at a rate dependent upon the density of said body and to a temperature at which carbonization will occur.
Claim 3
Dependent Claim
58 words
A process as defined in claim 1, in which the rate of temperature increase in said temperature range is at the rate of 2* to 5* F. per hour when the compacted density of said body is approximately 15 pounds per cubic foot or greater and the minimum dimension in one direction is greater than approximately one-half inch.
Claim 4
Dependent Claim
43 words
A process as defined in claim 1, in which the rate of temperature increase in said temperature range is approximately 33* to 150* F. per hour for wool fiber bodies in the density range of approximately 5 pounds per cubic foot or less.
Claim 5
Dependent Claim
42 words
A process as defined in claim 1, in which the rate of temperature increase in said temperature range is approximately 5* to 33* F. per hour for wool bodies in the density range of approximately 6 to 14 pounds per cubic foot.
Claim 6
Dependent Claim
42 words
A process as defined in claim 1, in which the rate of temperature increase in said temperature range is approximately 33* to 150* F. per hour for wool fiber bodies where the minimum dimension in one direction is less than one-half inch.
Claim 7
Dependent Claim
26 words
A process as defined in claim 1 which also includes flowing an inert gas around said body at least during a part of said heating stage.
Claim 8
Dependent Claim
26 words
A process as defined in claim 1 which includes the step of heating said body of wool fibers to a temperature of at least 1, 800*F.
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) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |