US4666741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compositions for the freeze protection of coal solids
Assignee: ChampionX LLC
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Filing: 1986-04-22
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Granted: 1987-05-19
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Expires: 2006-04-22
Abstract
Abstract Certain blends of mono and diethylene glycol and ethers thereof, when combined in certain proportions with urea, are excellent freeze protection for moist coal solids.
Inventors
- 👤 William J. Roe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:20
CPC Classifications
C; C10; C10L; C10L9/00; C10L9/10; C09; C09K; C09K3/00; C09K3/18
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
80 words
A method of treating particulate solids to reduce their cohesive strength when they are frozen which comprises: applying to at least some of the surfaces of said particulate solids prior to freezing an effective amount of a composition from the group consisting essentially of 35-60% by weight of a water-soluble glycol from the group consisting of mono and diethylene glycols and the mono and dimethyl and ethyl ethers thereof, from 5-35% by weight of urea, with the balance being water.
Claim 2
Independent Claim
80 words
A method of treating particulate solids to reduce their cohesive strength when they are frozen which comprises: applying to at least some of the surfaces of said particulate solids prior to freezing an effective amount of a composition from the group consisting essentially of 35-60% by weight of a water-soluble glycol from the group consisting of mono and diethylene glycols and the mono and dimethyl and ethyl ethers thereof, from 5-35% by weight of urea, with the balance being water.
Claim 3
Dependent Claim
12 words
The method of claim 1 where the water-soluble glycol is diethylene glycol.
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) | 1990-05-18 | 1990-11-17 | 1991-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-18 | 1994-11-17 | 1995-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-18 | 1998-11-17 | 1999-05-19 | $7700.00 | Window Closed / Lapsed |