US3400548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystal separation of dimethylnaphthalene
Assignee: Marathon Oil Co
•
Filing: 1965-06-25
•
Granted: 1968-09-10
•
Expires: 1985-06-25
Abstract
No abstract record available.
Inventors
- 👤 Dennis E Drayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:37
CPC Classifications
B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; B01D9/004; C; C07; C07C; C07C7/00; C07C7/14
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US290016A
Cited
US402968A
Cited
US2221993A
Cited
US2651922A
Cited
US2764880A
Cited
US2904412A
Cited
US3116124A
Cited
US3264753A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-10 | 1972-03-11 | 1972-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-10 | 1976-03-11 | 1976-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-10 | 1980-03-11 | 1980-09-10 | $7700.00 | Window Closed / Lapsed |