US2650940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of glycols
Assignee: —
•
Filing: —
•
Granted: 1953-09-01
•
Expires: 1970-09-01
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:10
CPC Classifications
C; C07; C07C; C07C31/00; C07C31/18; C07C31/20; C07C29/00; C07C29/09; C07C29/10; C07C29/103; C07C29/106; C07C31/205; C07C41/00; C07C41/01; C07C41/02; C07C41/03
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
31 words
PROCESS FOR THE MANUFACTURE OF 1-PHENYLETHANE-1,2-DIOL WHICH COMPRISES HEATING 1:2 EPOXY-1-PHENYLETHANE IN A CLOSED VESSEL IN INTIMATE CONTACT WITH AN AQUEOUS ALKALINE SOLUTION TO A TEMPERATURE BETWEEN 90* AND 200* C.
References Cited (Backward Citations)
US2135271A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-31 | 1957-03-02 | 1957-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-31 | 1961-03-02 | 1961-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-31 | 1965-03-02 | 1965-09-01 | $7700.00 | Window Closed / Lapsed |