US3674449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of briquetting fine-grained cokes with caking coal in a plastic state
Assignee: GEA Group AG
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Filing: 1970-05-21
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Granted: 1972-07-04
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Expires: 1990-05-21
Abstract
Abstract IN THE BRIQUETTING OF COKE, INCLUDING MIXING COKE WITH PLASTIC-FORM CAKING COAL TO FORM A MIXTURE AT A TEMPERATURE SUFFICIENTLY HIGH TO MAINTAIN THE PLASTIC STATE OF THE CAKING COAL, AND FORMING THE MIXTURE INTO BRIQUETTES; THE IMPROVEMENT OBTAINED BY HOLDING THE MIXTURE AT THE PRESELECTED HIGH TEMPERATURE FOR 20 TO 300 SECONDS UNDER CONDITIONS SUCH THAT THE MIXTURE IS MAINTAINED IN A STIRRED LAYER 50 TO 200 CENTIMETERS THICK.
Inventors
- 👤 Paul Schmalfeld
- 👤 Heinrich Janssen
- 👤 Burkhard Bock
- 👤 Werner Peters
- 👤 Erwin Ahland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:35
CPC Classifications
C; C10; C10L; C10L5/00; C10L5/02; C10L5/06; C10L5/10; C10L5/22; C10L5/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |