US4277520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Freeze modification agent
Assignee: BASF Corp
•
Filing: 1980-05-14
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Granted: 1981-07-07
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Expires: 2000-05-14
Abstract
Abstract The strength of ice is reduced by dissolving in water prior to freezing a composition of (A) a water-soluble polyhydroxy compound or monoalkylether thereof and (B) an alkali metal carbonate in an amount to provide an effective amount of (A) plus (B). The method is especially useful for application to particulate solids, such as coal and mineral ores, which are shipped and stored in masses exposed to freezing temperatures. Any ice that is formed is physically weak and will not deter the unloading of the thusly conditioned particulate solids.
Inventors
- 👤 Clyde G. Inks
- 👤 John W. Compton
- 👤 Kathryn M. Ellerman
- 👤 Lee H. Bergman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:24
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/18
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
51 words
A method for treating particulate solids having surface moisture to reduce the cohesive strength of masses of said solids when frozen, said method consisting of coating such solids with an effective amount of a fluid composition comprising (A) a water-soluble polyhydroxy compound or monoalkylether thereof and (B) an alkali metal carbonate.
Claim 2
Independent Claim
51 words
A method for treating particulate solids having surface moisture to reduce the cohesive strength of masses of said solids when frozen, said method consisting of coating such solids with an effective amount of a fluid composition comprising (A) a water-soluble polyhydroxy compound or monoalkylether thereof and (B) an alkali metal carbonate.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein said solids are coated with said fluid composition by spraying said fluid composition onto said solids.
Claim 4
Dependent Claim
18 words
The method of claim 2 wherein said component (A) is selected from the alkylene glycols and mixtures thereof.
Claim 5
Dependent Claim
27 words
The method of claim 3 wherein said fluid composition comprises about 0.025 to 0.40 part by weight of (B), alkali metal carbonate per part of compound (A).
Claim 6
Dependent Claim
13 words
The method of claim 4 wherein said alkali metal carbonate is sodium carbonate.
Claim 7
Dependent Claim
41 words
The method of claim 4 wherein said particulate solids ae coal particles and said composition is applied to said solids in amount of at least about 0.5 weight percent of (A) plus (B) based on the surface moisture on the solids.
Claim 8
Dependent Claim
21 words
The method of claim 6 wherein component (A) is a mixture of alkylene glycols and said component (B) is sodium carbonate.
References Cited (Backward Citations)
US4117214A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-07-06 | 1985-01-05 | 1985-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-06 | 1989-01-05 | 1989-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-06 | 1993-01-05 | 1993-07-07 | $7700.00 | Window Closed / Lapsed |