US3505201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of coal-oil suspensions
Assignee: Alberta Innovates
•
Filing: 1967-01-27
•
Granted: 1970-04-07
•
Expires: 1987-01-27
Abstract
No abstract record available.
Inventors
- 👤 Gordon W Hodgson
- 👤 George F Round
- 👤 Jan Kruyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:24
CPC Classifications
C; C10; C10B; C10B55/00; C10B55/02; C10B55/04; C10B55/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE24574E
Cited
US1512577A
Cited
US1983943A
Cited
US2449615A
Cited
US2624696A
Cited
US2793104A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-06 | 1973-10-06 | 1974-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-06 | 1977-10-06 | 1978-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-06 | 1981-10-06 | 1982-04-07 | $7700.00 | Window Closed / Lapsed |