US4088453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of solid fuel-water slurries
Assignee: Texaco Inc
•
Filing: 1976-06-24
•
Granted: 1978-05-09
•
Expires: 1996-06-24
Abstract
Abstract The pumpability of a solid fuel-water slurry is improved by the presence of a small amount of ammonia in the slurry.
Inventors
- 👤 Harry C. Wiese
- 👤 Jerrold R. Denchfield
- 👤 John C. Ahlborn, deceased
- 👤 executor by Lloyd Keys Ahlborn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:45
CPC Classifications
F; F17; F17D; F17D1/00; F17D1/08; F17D1/16; C; C10; C10L; C10L1/00; C10L1/32; C10L1/326; C10L5/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
41 words
A process for producing a solid fuel-water slurry of improved pumpability which comprises forming a solid fuel-water slurry also containing NH 4 OH in an amount between about 0.1 to 5.0 wt. % based on the total weight of the slurry.
Claim 2
Dependent Claim
41 words
A process for producing a solid fuel-water slurry of improved pumpability which comprises forming a solid fuel-water slurry also containing NH 4 OH in an amount between about 0.1 to 5.0 wt. % based on the total weight of the slurry.
Claim 3
Dependent Claim
12 words
The process of claim 1 in which the solid fuel is lignite.
Claim 4
Dependent Claim
13 words
The process of claim 1 in which the solid fuel is bituminous coal.
Claim 5
Dependent Claim
13 words
The process of claim 1 in which the solid fuel is sub-bituminous coal.
Claim 6
Dependent Claim
12 words
The process of claim 1 in which the solid fuel is anthracite.
Claim 7
Dependent Claim
20 words
The process of claim 1 in which at least 50% of the solid fuel passes through a 200 mesh sieve.
Claim 8
Dependent Claim
20 words
The process of claim 6 in which at least 80% of the solid fuel passes through a 200 mesh sieve.
Claim 9
Dependent Claim
22 words
The process of claim 1 in which the NH 4 OH is added in an amount between 0.2 and 3.0 wt. %.
Claim 10
Dependent Claim
24 words
The process of claim 6 in which the slurry contains between about 50 and 60 wt. % solid fuel measured on a dry basis.
Claim 11
Dependent Claim
23 words
The process of claim 1 in which the NH 4 OH is formed by contacting the slurry water with gaseous NH 3 .
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) | 1981-05-08 | 1981-11-07 | 1982-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-08 | 1985-11-07 | 1986-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-08 | 1989-11-07 | 1990-05-09 | $7700.00 | Window Closed / Lapsed |