US4331445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduction of spontaneous combustion of coal
Assignee: Internorth Inc
•
Filing: 1981-04-03
•
Granted: 1982-05-25
•
Expires: 2001-04-03
Abstract
Abstract A composition for the prevention of spontaneous combustion of coal is described which is comprised of at least about 2 percent of polyethylene oxide and the balance water. Also described is a method for reducing the spontaneous combustion tendency of coal by contacting coal with the above composition and then drying the coal.
Inventors
- 👤 Edward J. Burns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:24
CPC Classifications
C; C10; C10L; C10L9/00; C10L9/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
36 words
A method for decreasing the spontaneous combustion tendency of coal which comprises contacting the coal with a composition comprised of at least about 2 percent polyethylene oxide and the balance water, and then drying the coal.
Claim 2
Independent Claim
36 words
A method for decreasing the spontaneous combustion tendency of coal which comprises contacting the coal with a composition comprised of at least about 2 percent polyethylene oxide and the balance water, and then drying the coal.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein the coal is immersed in said composition.
Claim 4
Dependent Claim
30 words
The method of claim 2 wherein the drying is accomplished by allowing the treated coal to dry in the open air at ambient temperature for at least about 2 hours.
Claim 5
Dependent Claim
13 words
The method of claim 1 wherein said composition is sprayed onto the coal.
Claim 6
Dependent Claim
28 words
The method of claim 4 wherein drying is accomplished by allowing the coal to dry in the open air at ambient temperature for at least about 2 hours.
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) | 1985-05-24 | 1985-11-23 | 1986-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-24 | 1989-11-23 | 1990-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-24 | 1993-11-23 | 1994-05-25 | $7700.00 | Window Closed / Lapsed |