Patent US4398919A successfully refreshed from Google Patents.
US4398919A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyethoxylated compounds as coal-water slurry surfactants
Assignee: Akzona Inc
•
Filing: 1981-11-04
•
Granted: 1983-08-16
•
Expires: 2001-11-04
Abstract
Abstract The present invention is directed to aqueous-comminuted coal slurries. Specifically, the invention is directed to slurries that include as surfactants about 0.1 to 0.5 weight percent surfactant compounds, as for example polyoxyethylene (2) oleamide, and which typically have a coal solids content of 70%.
Inventors
- 👤 Moneeb Zakaria
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:02
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/32; C10L1/326
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
73 words
A pumpable coal and water slurry, said slurry comprising comminuted coal, water, and a surfactant corresponding to the formula ##STR2## wherein R is an alkyl group having between 8 and 18 carbon atoms, x and y are each integers equal to or greater than 1, the sum of x and y is between 2 and 15, and wherein the active surfactant content of said slurry is from about 0.1 to 0.5 weight percent.
Claim 2
Dependent Claim
73 words
A pumpable coal and water slurry, said slurry comprising comminuted coal, water, and a surfactant corresponding to the formula ##STR2## wherein R is an alkyl group having between 8 and 18 carbon atoms, x and y are each integers equal to or greater than 1, the sum of x and y is between 2 and 15, and wherein the active surfactant content of said slurry is from about 0.1 to 0.5 weight percent.
Claim 3
Dependent Claim
21 words
The slurry as set forth in claim 1, wherein said slurry has a coal content of at least 70% by weight.
Claim 4
Dependent Claim
17 words
The slurry as set forth in claim 1, wherein x and y are each equal to 1.
Claim 5
Dependent Claim
17 words
The slurry as set forth in claim 2, wherein x and y are each equal to 1.
Claim 6
Dependent Claim
16 words
The slurry as set forth in claim 3, wherein R is C 18 H 35 -.
Claim 7
Dependent Claim
16 words
The slurry as set forth in claim 4, wherein R is C 18 H 35 -.
Claim 8
Dependent Claim
19 words
The slurry as set forth in claim 1, wherein the sum of x and y is equal to 15.
Claim 9
Dependent Claim
19 words
The slurry as set forth in claim 2, wherein the sum of x and y is equal to 15.
Claim 10
Dependent Claim
16 words
The slurry as set forth in claim 7, wherein R is C 18 H 35 -.
Claim 11
Dependent Claim
16 words
The slurry as set forth in claim 8, wherein R is C 18 H 35 -.
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) | 1986-08-15 | 1987-02-14 | 1987-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-15 | 1991-02-14 | 1991-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-15 | 1995-02-14 | 1995-08-16 | $7700.00 | Window Closed / Lapsed |