US4425252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for respiratory coal dust abatement
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1981-11-19
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Granted: 1984-01-10
•
Expires: 2001-11-19
Abstract
Abstract Abatement of respiratory coal dust is facilitated by water spraying the dusty area with a system having at least about 50 ppm of the combination of a water soluble sulfonic acid salt and a nonionic surfactant having an HLB ranging from 12 to 14.
Inventors
- 👤 Virgil H. Cargle
- 👤 Wilbur L. Bridges
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:58
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/22
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
76 words
A formulation for the abatement of respiratory coal dust comprising water containing from 50 to 2,000 parts per million concentration of a coal dust wetting combination comprising: (a) 10 to 90 parts by weight of a water soluble salt of dodecyl benzene sulfonic acid; and, (b) 90 to 10 parts by weight of a nonionic surfactant which is a polyethoxylated C 8 to C 10 alkyl phenol containing from 6 to 14 moles of ethylene oxide.
Claim 2
Dependent Claim
76 words
A formulation for the abatement of respiratory coal dust comprising water containing from 50 to 2,000 parts per million concentration of a coal dust wetting combination comprising: (a) 10 to 90 parts by weight of a water soluble salt of dodecyl benzene sulfonic acid; and, (b) 90 to 10 parts by weight of a nonionic surfactant which is a polyethoxylated C 8 to C 10 alkyl phenol containing from 6 to 14 moles of ethylene oxide.
Claim 3
Dependent Claim
37 words
A formulation according to claim 1 wherein said nonionic surfactant is nonyl phenol reacted with 10 moles of ethylene oxide and the weight ratio of said sulfonic acid to said nonionic surfactant is from 2:4 to 4:2.
Claim 4
Dependent Claim
14 words
A formulation according to claim 2 wherein the cation of the salt is sodium.
Claim 5
Dependent Claim
12 words
A formulation according to claim 3 wherein said weight ratio is 1:1.
Claim 6
Dependent Claim
37 words
A formulation according to claim 1 wherein there is also from 2 to 20 parts by weight of a cosolvent of the class of alkylene glycol monoalkyl ethers, C 2 to C 5 alkanols and mixtures thereof.
Claim 7
Dependent Claim
21 words
A process for the abatement of respiratory coal dust comprising spraying the dusty area with a formulation according to claim 1.
Claim 8
Dependent Claim
78 words
An aqueous concentrate comprising from about 25 to 75 weight percent of a coal dust wetting combination consisting essentially of from 10 to 90 parts by weight of a water soluble salt of dodecyl benzene sulfonic acid and 90 to 10 parts by weight of a nonionic surfactant having an HLB ranging from 12 to 14, said nonionic surfactant being a polyethoxylated C 8 to C 10 alkyl phenol containing from 6 to 14 moles of ethylene oxide.
Claim 9
Dependent Claim
78 words
An aqueous concentrate comprising from about 25 to 75 weight percent of a coal dust wetting combination consisting essentially of from 10 to 90 parts by weight of a water soluble salt of dodecyl benzene sulfonic acid and 90 to 10 parts by weight of a nonionic surfactant having an HLB ranging from 12 to 14, said nonionic surfactant being a polyethoxylated C 8 to C 10 alkyl phenol containing from 6 to 14 moles of ethylene oxide.
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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) | 1987-01-09 | 1987-07-11 | 1988-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-09 | 1991-07-11 | 1992-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-09 | 1995-07-11 | 1996-01-10 | $7700.00 | Window Closed / Lapsed |