US4324562A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of improving the storage safety of pulverized brown coal
Assignee: Individual
•
Filing: 1979-09-17
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Granted: 1982-04-13
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Expires: 1999-09-17
Abstract
Abstract A method is given with the help of which pulverized brown coal can be stored safely, that is, it can be made safe against self-ignition. The pulverized brown coal is mixed with at least 20% by weight anthracite dust until the particle mixture shows a uniform, black, anthracite-like color. Defined limits for the grain size of the pulverized brown coal and the anthracite dust must be observed.
Inventors
- 👤 Fritz Schoppe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:54
CPC Classifications
C; C10; C10L; C10L9/00; C10L9/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
Method of improving the storage safety of pulverized brown coal by covering brown coal particles with smaller particles of finely pulverized anthracite, wherein about 2% or less of the anthracite particles have a size over 0.010 mm and about 23% or less of the anthracite particles have a size over 0.005 mm, and wherein the brown coal particles are about ten times the size of the anthracite particles, about 14% or less of the brown coal particles having a size over 0.2 mm and about 40% or less of the brown coal particles having a size over 0.063 mm, comprising mixing such brown coal particles with at least about 20% by weight of such anthracite particles before storage and continuing mixing until the particle mixture shows a uniform, black, anthracite-like color.
Claim 2
Dependent Claim
131 words
Method of improving the storage safety of pulverized brown coal by covering brown coal particles with smaller particles of finely pulverized anthracite, wherein about 2% or less of the anthracite particles have a size over 0.010 mm and about 23% or less of the anthracite particles have a size over 0.005 mm, and wherein the brown coal particles are about ten times the size of the anthracite particles, about 14% or less of the brown coal particles having a size over 0.2 mm and about 40% or less of the brown coal particles having a size over 0.063 mm, comprising mixing such brown coal particles with at least about 20% by weight of such anthracite particles before storage and continuing mixing until the particle mixture shows a uniform, black, anthracite-like color.
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) | 1985-04-12 | 1985-10-12 | 1986-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-12 | 1989-10-12 | 1990-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-12 | 1993-10-12 | 1994-04-13 | $7700.00 | Window Closed / Lapsed |