Patent US5117359A successfully refreshed from Google Patents.
US4337294A
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US
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Rubber covered carbon black pellets
Assignee: Phillips Petroleum Co
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Filing: 1980-05-02
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Granted: 1982-06-29
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Expires: 2000-05-02
Abstract
Abstract Carbon black pellets are covered with rubber to prevent dusting problems. A process and apparatus for covering carbon black pellets with rubber is also disclosed.
Inventors
- 👤 Thomas J. Gunnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:52
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/56; C08; C08K; C08K3/00; C08K3/02; C08K3/04; C01; C01P; C01P2004/00; C01P2004/60; C01P2006/00; C01P2006/14; C01P2006/16; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998; Y10T428/30
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
31 words
Dust free carbon black pellet consisting essentially of (a) a carbon black pellet core, which is substantially free of rubber (b) a layer of rubber surrounding said carbon black pellet core.
Claim 2
Dependent Claim
31 words
Dust free carbon black pellet consisting essentially of (a) a carbon black pellet core, which is substantially free of rubber (b) a layer of rubber surrounding said carbon black pellet core.
Claim 3
Dependent Claim
20 words
A pellet in accordance with claim 1 wherein said rubber is composed essentially of a conjugated alkadiene polymer or copolymer.
Claim 4
Dependent Claim
38 words
A pellet in accordance with claim 1 wherein said rubber is a copolymer of one or more conjugated alkadiene monomers of 4 to 8 carbon atoms and one or more vinylaromatic monomers of 8 to 12 carbon atoms.
Claim 5
Dependent Claim
32 words
A pellet in accordance with claim 1 comprising in said rubber a cross linking inhibitor in a quantity to substantially prevent cross linking of said latex during the covering and drying operation.
Claim 6
Dependent Claim
23 words
A pellet in accordance with claim 1 wherein said rubber is composed of molecules of low molecular weight and narrow molecular weight distribution.
Claim 7
Dependent Claim
18 words
Pellet in accordance with claim 1 wherein the carbon black pellet core consists essentially entirely of carbon black.
References Cited (Backward Citations)
US2457963A
Cited
US2908586A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-06-28 | 1985-12-28 | 1986-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-28 | 1989-12-28 | 1990-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-28 | 1993-12-28 | 1994-06-29 | $7700.00 | Window Closed / Lapsed |