US2507485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of nu-aryl-2, 4-diketotegrahydroquinolines
Assignee: GAF Chemicals Corp
•
Filing: 1946-06-14
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Granted: 1950-05-09
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Expires: 1966-06-14
Abstract
No abstract record available.
Inventors
- 👤 Curt G Vogt
- 👤 Charlotte G Verdery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:15
CPC Classifications
C; C07; C07D; C07D215/00; C07D215/02; C07D215/16; C07D215/20; C07D215/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
IN THE PROCESS OF PREPARING AN N-ARYL-2, 4DIKETO-TETRAHYDROQUINOLINE BY HEATING THE CORRESPONDING N-MONOARYL-A-AMINOBENZOIC ACID WITH ACETIC ANHYDRIDE, THE IMPROVEMENT WITH COMPRISES CONDUCTING THE REACTION IN THE PRESENCE OF A PROPORATION OF ADDED GLACIAL ACETIC ACID CORRESPONDING TO A WEIGHT RATIO OF FROM ABOUT 1:10 TO 20:1 BASED ON THE N-MONARYL-O-AMINOBENZOIC ACID.
Claim 2
Dependent Claim
51 words
IN THE PROCESS OF PREPARING AN N-ARYL-2, 4DIKETO-TETRAHYDROQUINOLINE BY HEATING THE CORRESPONDING N-MONOARYL-A-AMINOBENZOIC ACID WITH ACETIC ANHYDRIDE, THE IMPROVEMENT WITH COMPRISES CONDUCTING THE REACTION IN THE PRESENCE OF A PROPORATION OF ADDED GLACIAL ACETIC ACID CORRESPONDING TO A WEIGHT RATIO OF FROM ABOUT 1:10 TO 20:1 BASED ON THE N-MONARYL-O-AMINOBENZOIC ACID.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-08 | 1953-11-07 | 1954-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-08 | 1957-11-07 | 1958-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-08 | 1961-11-07 | 1962-05-09 | $7700.00 | Window Closed / Lapsed |