US3540995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
H-coal process:slurry oil system
Assignee: HRI Inc
•
Filing: 1968-11-14
•
Granted: 1970-11-17
•
Expires: 1988-11-14
Abstract
No abstract record available.
Inventors
- 👤 Ronald H Wolk
- 👤 Edwin S Johanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:05
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/08; C10G1/083
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US3030297A
Cited
US2987465A
Cited
US3075912A
Cited
US3183180A
Cited
US3321393A
Cited
US3496094A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-16 | 1974-05-18 | 1974-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-16 | 1978-05-18 | 1978-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-16 | 1982-05-18 | 1982-11-17 | $7700.00 | Window Closed / Lapsed |