US2772265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the recovery of coal resins with simultaneous partial desulphurisation of the coal
Assignee: Individual
•
Filing: 1954-06-29
•
Granted: 1956-11-27
•
Expires: 1974-06-29
Abstract
No abstract record available.
Inventors
- 👤 Siddiqui Salimuzzaman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:54
CPC Classifications
C; C10; C10C; C10C1/00; C10C1/18; C10L; C10L9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
A PROCESS FOR THE RECOVERY OF RESINS AND WAXES FROM COAL WITH SIMULTANEOUS DESULPHURISATION AND IMPROVEMENT OF THE COAL, WHICH CONSISTS IN SUBJECTING POWDERED COAL TO THE ACTION OF SUPERHEATED STEAM AT A SUB-CARBONISATION TEMPERATURE RANGE OF THE COALS, AND PREFERABLY AT 200* C. TO 330* C.
Claim 2
Dependent Claim
47 words
A PROCESS FOR THE RECOVERY OF RESINS AND WAXES FROM COAL WITH SIMULTANEOUS DESULPHURISATION AND IMPROVEMENT OF THE COAL, WHICH CONSISTS IN SUBJECTING POWDERED COAL TO THE ACTION OF SUPERHEATED STEAM AT A SUB-CARBONISATION TEMPERATURE RANGE OF THE COALS, AND PREFERABLY AT 200* C. TO 330* C.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-27 | 1960-05-28 | 1960-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-27 | 1964-05-28 | 1964-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-27 | 1968-05-28 | 1968-11-27 | $7700.00 | Window Closed / Lapsed |