US2944056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing quinazoline derivatives
Assignee: Sumitomo Chemical Co Ltd
•
Filing: 1957-05-22
•
Granted: 1960-07-05
•
Expires: 1977-05-22
Abstract
No abstract record available.
Inventors
- 👤 Murahashi Shunsuke
- 👤 Horiie Shigeki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:17
CPC Classifications
C; C07; C07D; C07D231/00; C07D231/54; C07D231/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
A METHOD OF PRODUCING A 3-PHENYLQUINAZOLINE-2,4DIONE COMPRISING CONTACTING AZOBENZENE WITH CARBON MONOXIDE IN BENZENE AT A PRESSURE OF AT LEAST ABOUT 10 ATMOSPHERES AND A TEMPERATURE OF RROM ABOUT 200-300* CENTIGRADE IN THE PRESENCE OF COBALT CARBONYL.
Claim 2
Independent Claim
37 words
A METHOD OF PRODUCING A 3-PHENYLQUINAZOLINE-2,4DIONE COMPRISING CONTACTING AZOBENZENE WITH CARBON MONOXIDE IN BENZENE AT A PRESSURE OF AT LEAST ABOUT 10 ATMOSPHERES AND A TEMPERATURE OF RROM ABOUT 200-300* CENTIGRADE IN THE PRESENCE OF COBALT CARBONYL.
References Cited (Backward Citations)
US2769003A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-05 | 1964-01-04 | 1964-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-05 | 1968-01-04 | 1968-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-05 | 1972-01-04 | 1972-07-05 | $7700.00 | Window Closed / Lapsed |