Patent US1980901A successfully refreshed from Google Patents.
US1980901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resolution of mixtures of phenols into their components
Assignee: William Blythe & Co Ltd
•
Filing: 1932-02-13
•
Granted: 1934-11-13
•
Expires: 1952-02-13
Abstract
No abstract record available.
Inventors
- 👤 Bentley William Henry
- 👤 Catlow Benjamin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:11
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/68; C07C201/00; C07C201/06; C07C201/16; C07C37/86; C07C41/00; C07C41/01; C07C41/34; C07C41/44
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) | 1937-11-12 | 1938-05-14 | 1938-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-11-12 | 1942-05-14 | 1942-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-11-12 | 1946-05-14 | 1946-11-13 | $7700.00 | Window Closed / Lapsed |