Patent US3679573A successfully refreshed from Google Patents.
US3679573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two stage counter-current hydrogenation of coal
Assignee: HRI Inc
•
Filing: 1971-03-08
•
Granted: 1972-07-25
•
Expires: 1991-03-08
Abstract
Abstract IN THE EBULLATED BED CATALYTIC HYDROGENATION OF COAL INTO HYDROCARBONACEOUS PRODUCTS EITHER GREATER COAL THROUGHPUT PER POUND OF CATALYST CAN BE ACHIEVED OR, ALTERNATIVELY, LESS CATALYST PER TON OF COAL CAN BE EMPLOYED BY CONDUCTING THE HYDROGENATION OF THE COAL IN FIRST AND SECOND STAGE EBULLATED BED REACTION ZONES AND BY USING THE PARTIALLY SPENT CATALYST FROM THE SECOND STAGE AS THE CATALYST IN THE FIRST STAGE.
Inventors
- 👤 Clarence A Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:24
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/08; C10G1/086; C10G1/006
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |