US3740861A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for drying carbon black pellets
Assignee: Cities Service Co
•
Filing: 1970-06-17
•
Granted: 1973-06-26
•
Expires: 1990-06-17
Abstract
Abstract Wet pellets of carbon black are dried to produce dry pellets by means of a two-step process. In the first step a bed of wet pellets is fluidized by means of a heated gas and the pellets are thus partially dried. In the second step the partially dried pellets from the first step are subjected to additional drying while in a nonfluidized state, e.g. pellets from the fluidized bed are heated and subjected to a mild, mechanically produced tumbling action during the second step.
Inventors
- 👤 C Myers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:00
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/56; C09C1/58; C01; C01P; C01P2004/00; C01P2004/50
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
27 words
The method of claim 1 wherein a bed of the partially dried pellets is heated and subjected to a mild, mechanically-produced tumbling action during said subsequent step.
Claim 2
Dependent Claim
27 words
The method of claim 1 wherein said bed of pellets is heated and tumbled by passing the partially dried pellets to and through the rotary drum dryer.
Claim 3
Dependent Claim
37 words
The method of claim 1 wherein the gas by means of which the bed of wet pellets is fluidized is introduced into said bed at a temperature of within the range of about 500*F to about 1,200*F.
Claim 4
Dependent Claim
23 words
The method of claim 4 wherein the temperature of the fluidized bed is maintained within the range of about 130*F to about 160*F.
Claim 5
Dependent Claim
11 words
The method of claim 1 wherein the fluidizing gas is air.
Claim 6
Dependent Claim
28 words
The method of claim 1 wherein the fluidizing gas is air in mixture with hot combustion products produced by burning a fluid fuel with a free-oxygen containing gas.
Claim 7
Dependent Claim
32 words
The method of claim 1 wherein the ratio of height to area of the fluidized bed is within the range of about 1 ft./12 sq. ft. to about 1 ft./24 sq. ft.
Claim 8
Dependent Claim
31 words
The method of claim 1 wherein the length of time to which the pellets are exposed to drying conditions in the first step is substantially shorter than in the subsequent step.
Claim 9
Dependent Claim
47 words
The method of claim 9 wherein the time of exposure in the first step is within the range of about 5 minutes to about 10 minutes and the time of exposure in the subsequent step is within the range of about 20 minutes to about 30 minutes.
Claim 10
Dependent Claim
26 words
The method of claim 1 wherein the pellets are heated to a temperature within the range of about 250*F to about 500*F during said subsequent step.
Claim 11
Dependent Claim
27 words
The method of claim 1 wherein the depth of the fluidized bed of wet pellets is maintained within the range of about 6 to about 12 inches.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |