US3637263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transportation of coal by pipeline
Assignee: Bechtel International Corp
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Filing: 1970-03-03
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Granted: 1972-01-25
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Expires: 1990-03-03
Abstract
Abstract This invention relates to the art of transporting coal with water through pipelines. More particularly, it relates to a method of preparing at one point an aqueous slurry made up of a mixture of particulate coal and an inorganic finely divided water insoluble solid carrier having a specific gravity of at least 1.6. The slurry is then pumped through a pipeline to a location many miles away where, after being separated from the carrier, the coal is utilized and the coal-free carrier is returned to the point of beginning. By using a material heavier than coal, the settling rate of the coarse coal can be reduced nearly to zero while maintaining turbulent flow conditions.
Inventors
- 👤 Edward J Wasp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:05
CPC Classifications
B; B65; B65G; B65G53/00; B65G53/30
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
34 words
A method as claimed in claim 1 wherein said second slurry contains about 33 weight percent of coarse coal and about 30 weight percent of said solid carrier fines and the balance being water.
Claim 2
Dependent Claim
14 words
A method as claimed in claim 1 wherein said solid carrier fines comprise magnetite.
Claim 3
Dependent Claim
15 words
A method as claimed in claim 1 wherein said solid carrier fines comprise coal ash.
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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |