US3907583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grinding rubber-reinforcing carbonaceous pigment with sulfur
Assignee: Bridgestone Firestone Inc
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Filing: 1973-08-16
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Granted: 1975-09-23
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Expires: 1993-08-16
Abstract
Abstract Carbonaceous material is ground at an elevated temperature in the presence of sulfur to obtain a rubber-reinforcing black with superior properties as a reinforcing agent in rubbers.
Inventors
- 👤 Grant Crane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:16
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/482; C01; C01P; C01P2006/00; C01P2006/12
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
83 words
THE PROCESS OF PRODUCING A REINFORCING BLACK FROM BRITTLE CARBONACEOUS MATERIAL PRODUCED BY THE PYROLIZATION OF SCRAP RUBBER IN THE SUBSTANTIAL ABSENCE OF AIR, WHICH PROCESS COMPRISES GRINDING THE CARBONACEOUS MATERIAL IN A FLUID-ENERGY MILL IN AN ATMOSPHERE OF STEAM IN THE PRESENCE OF 0.01 TO 10 PERCENT OF SULFUR BASED ON THE WEIGHT OF THE CARBONACEOUS MATERIAL, AT AN ELEVATED TEMPERATURE AT WHICH THE SULFUR HAS A VAPOR PRESSUE OF AT LEAST 1 MM. OF MERCURY AND NOT GREATER THAN 760 MM.
Claim 2
Dependent Claim
83 words
THE PROCESS OF PRODUCING A REINFORCING BLACK FROM BRITTLE CARBONACEOUS MATERIAL PRODUCED BY THE PYROLIZATION OF SCRAP RUBBER IN THE SUBSTANTIAL ABSENCE OF AIR, WHICH PROCESS COMPRISES GRINDING THE CARBONACEOUS MATERIAL IN A FLUID-ENERGY MILL IN AN ATMOSPHERE OF STEAM IN THE PRESENCE OF 0.01 TO 10 PERCENT OF SULFUR BASED ON THE WEIGHT OF THE CARBONACEOUS MATERIAL, AT AN ELEVATED TEMPERATURE AT WHICH THE SULFUR HAS A VAPOR PRESSUE OF AT LEAST 1 MM. OF MERCURY AND NOT GREATER THAN 760 MM.
Claim 3
Dependent Claim
39 words
The process of claim 1 in which the carbonaceous material which is ground is char produced by the pyrolization in the absence of air of a selected portion of automobile tire scrap which is compounded with a reinforcing black.
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) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |