Patent US3418971A successfully refreshed from Google Patents.
Patent US2159114A successfully refreshed from Google Patents.
Patent US3044980A successfully refreshed from Google Patents.
Patent US4879148A successfully refreshed from Google Patents.
Patent US3785708A successfully refreshed from Google Patents.
Patent US2297588A successfully refreshed from Google Patents.
US2297588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of phenols and alkylated products thereof
Assignee: Gulf Research and Development Co
•
Filing: 1942-03-07
•
Granted: 1942-09-29
•
Expires: 1962-03-07
Abstract
No abstract record available.
Inventors
- 👤 Donald R Stevens
- 👤 Clarence J Livingstone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:51
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/68; C07C37/86; C07C37/11; C07C37/14; C07C37/50
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) | 1945-09-28 | 1946-03-30 | 1946-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-09-28 | 1950-03-30 | 1950-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-09-28 | 1954-03-30 | 1954-09-29 | $7700.00 | Window Closed / Lapsed |