Patent US3966693A successfully refreshed from Google Patents.
Patent US4195975A successfully refreshed from Google Patents.
US4195975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized fuel slurry
Assignee: DKS Co Ltd
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Filing: 1978-04-17
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Granted: 1980-04-01
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Expires: 1998-04-17
Abstract
Abstract A fuel slurry comprising a mixture of a fuel oil and pulverized coal may be effectively stabilized with a small amount of a condensation product of a sulfonated benzene or naphthalene derivative-formaldehyde, ligninsulfonic acid, carboxymethylcellulose, carboxymethyl-starch or a salt thereof.
Inventors
- 👤 Yasumasa Hamuro
- 👤 Akihiro Naka
- 👤 Shuichi Honjo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:48
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/32; C10L1/322; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/03; Y10S516/06
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
86 words
A fuel slurry composition comprising a fuel oil, 20 to 60% of pulverized coal having an average particle size of 10 to 200 microns, an effective amount of a stabilizing agent selected from the group consisting of a condensate of a sulfonated benzene or naphthalene derivative with formaldehyde, a salt thereof, carboxymethylcellulose, a salt thereof, carboxymethylstarch and a salt thereof and 1 to 30% of water present in an amount sufficient to further stabilize the slurry, all % being by weight relative to the entire composition.
Claim 2
Dependent Claim
86 words
A fuel slurry composition comprising a fuel oil, 20 to 60% of pulverized coal having an average particle size of 10 to 200 microns, an effective amount of a stabilizing agent selected from the group consisting of a condensate of a sulfonated benzene or naphthalene derivative with formaldehyde, a salt thereof, carboxymethylcellulose, a salt thereof, carboxymethylstarch and a salt thereof and 1 to 30% of water present in an amount sufficient to further stabilize the slurry, all % being by weight relative to the entire composition.
Claim 3
Dependent Claim
21 words
The composition of claim 1, wherein said stabilizing agent is a condensation product of a salt of naphthalenesulfonic acid and formaldehyde.
Claim 4
Dependent Claim
25 words
The composition of claim 1, wherein said stabilizing agent is a condensation product of a salt of C 1 -C 4 alkylnaphthalenesulfonic acid and formaldehyde.
Claim 5
Dependent Claim
25 words
The composition of claim 1, wherein said stabilizing agent is a condensation product of a salt of naphthalene-sulfonic acid and a salt of phenolsulfonic acid-formaldehyde.
Claim 6
Dependent Claim
22 words
The composition of claim 1, wherein said stabilizing agent is a condensation product of C 6 -C 13 benzenesulfonic acid and formaldehyde.
Claim 7
Dependent Claim
15 words
The composition of claim 1, wherein said stabilizing agent is carboxymethylcellulose or a salt thereof.
Claim 8
Dependent Claim
15 words
The composition of claim 1, wherein said stabilizing agent is carboxymethylstarch or a salt thereof.
Claim 9
Dependent Claim
29 words
The composition of claim 1 containing an effective amount of a viscosity reducing agent selected from the group consisting of an anionic sulfonate surfactant and an anionic sulfate surfactant.
Claim 10
Dependent Claim
20 words
The composition of claim 8, wherein said viscosity reducing agent is a salt of C 6 -C 13 alkylbenzene-sulfonic acid.
Claim 11
Dependent Claim
16 words
The composition of claim 8, wherein said viscosity reducing agent is a salt of phenol-sulfonic acid.
Claim 12
Dependent Claim
23 words
The composition of claim 9, wherein said viscosity reducing agent is a salt of sulfuric ester of C 8 -C 20 aliphatic alcohol.
Claim 13
Dependent Claim
32 words
The composition of claim 8, wherein said viscosity reducing agent is a salt of polyoxyethylene alkylphenol sulfate having an average of 2-10 oxyethylene units and 6-3 carbon atoms in the alkyl group.
Claim 14
Dependent Claim
27 words
The composition of claim 8, wherein said viscosity reducing agent is a salt of sulfuric ester of polyoxyethylene alcohol ether having an average of 2-15 oxyethylene units.
Claim 15
Dependent Claim
22 words
The composition of claim 8, wherein said viscosity reducing agent is present in an amount less than that of said stabilizing agent.
Claim 16
Dependent Claim
18 words
The composition of claim 1, wherein said fuel oil is petroleum crude oil or a liquid fraction thereof.
Claim 17
Dependent Claim
16 words
The composition of claim 1, wherein said coal is anthracite, bituminous coal, sub-bituminous coal or lignite.
Claim 18
Dependent Claim
23 words
The composition of claim 1, wherein said water is present in an amount from 2 to 20% by weight of the entire composition.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-01 | 1983-10-01 | 1984-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-01 | 1987-10-01 | 1988-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-01 | 1991-10-01 | 1992-04-01 | $7700.00 | Window Closed / Lapsed |