US3966487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyrolization
Assignee: Bridgestone Firestone Inc
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Filing: 1974-05-24
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Granted: 1976-06-29
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Expires: 1994-05-24
Abstract
Abstract The invention relates to the process for recovery of carbon black of controlled quality from scrap-rubber vulcanizates. Scrap rubber is selected on the basis of the quality of the carbon black used in the preparation of the rubber from which the scrap is obtained. The scrap is continuously pyrolized to produce a product composed largely of the carbon black originally present in the scrap. The recovered carbon black is ground and may be used as a reinforcing agent as such, or optionally it may be pelletized to facilitate handling.
Inventors
- 👤 Grant Crane
- 👤 Edward Leo Kay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:26
CPC Classifications
B; B29; B29B; B29B17/00; B29B17/02; C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/482; B01; B01J; B01J19/00; B29B17/04; B29B2017/0424; B29B2017/0496; B29K; B29K2707/00; B29K2707/04; B29L; B29L2030/00; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/62
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
78 words
The process of producing carbon black from scrap tires which comprises separating the tire treads from other parts of the tires so as to obtain scrap rubber composed essentially of tread stock and substantially free of other rubber stock, calcining said scrap rubber in the substantial absence of air and reducing the particle size of the char obtained and thus producing a char which is suitable for use as a carbon black for compounding in tire tread stock.
Claim 2
Dependent Claim
78 words
The process of producing carbon black from scrap tires which comprises separating the tire treads from other parts of the tires so as to obtain scrap rubber composed essentially of tread stock and substantially free of other rubber stock, calcining said scrap rubber in the substantial absence of air and reducing the particle size of the char obtained and thus producing a char which is suitable for use as a carbon black for compounding in tire tread stock.
Claim 3
Dependent Claim
78 words
The process of producing carbon black from scrap tires which comprises separating the tire carcasses from other parts of the tires so as to obtain scrap rubber composed essentially of carcass stock and substantially free of other rubber stock, calcining said scrap rubber in the substantial absence of air and reducing the particle size of the char obtained and thus producing a char which is suitable for use as a carbon black for compounding in tire carcass stock.
Claim 4
Dependent Claim
78 words
The process of producing carbon black from scrap tires which comprises separating the tire carcasses from other parts of the tires so as to obtain scrap rubber composed essentially of carcass stock and substantially free of other rubber stock, calcining said scrap rubber in the substantial absence of air and reducing the particle size of the char obtained and thus producing a char which is suitable for use as a carbon black for compounding in tire carcass stock.
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) | 1979-06-29 | 1979-12-29 | 1980-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-29 | 1983-12-29 | 1984-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-29 | 1987-12-29 | 1988-06-29 | $7700.00 | Window Closed / Lapsed |