US2830993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quinolizine derivatives
Assignee: —
•
Filing: —
•
Granted: 1958-04-15
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Expires: 1975-04-15
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:47
CPC Classifications
C; C07; C07D; C07D455/00; C07D455/03; C07D455/04; C07D455/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
A PROCESS WHICH COMPRISES CONDENSING 1-LOWER CARBALKOXY - METHYL-6,7-DI(LOWER ALKOXY)-1,2,3,4-TETRAHYDROISOQUINOLINE WITH A MEMBER OF THE GROUP CONSISTING OF FORMALDEHYDE AND A PARAFORMALDEHYDE AND WITH A-HYDROCARBYL-MALONIC ACID DIMETYL ESTER HY HEATING SAID REACTANTS TOGETHER THEREBY PRODUCING 1-LOWER CARBALKOXYMETHYL - 2 - (2,2 - DICARBOMETHOXY-2-HYDROCARBYL-ETHYL)6,7-DI(LOWER ALKOXY)-1,2,3,4-TETRAHYDROISOQUINOLINE, CYCLIZING THE LATTER BY HEATING WITH AN ALKALI METAL ALKOXIDE THEREBY PRODUCING 1-LOWER CARBALKOXY-2-OXO-3-CARBOMETHOXY - 3 - HYDROCARBYL-9,10-DI(LOWER ALKOXY)-1,2,3,4, 6,7-HEXAHYDRO-11B-BENZO(A) QUINOLIZINE, AND HYDROLYZING AND DECARBOXYLATING THE LATTER BY HEATING WITH AN AQUEOUS SOLUTION OF A MINERAL ACID THEREBY PRODUCING 2-OXO-3-HYDROCARBYL -9,10-DI(LOWER ALKOXY)-1,2,3,4,6,7-HEXAHYDRO11B-BENZO(A) QUINOLIZINE SAID HYDROCARBYL BEING A HYDROCARBON RADICAL HAVING LESS THAN EIGHT CARBON ATOMS.
Claim 2
Dependent Claim
99 words
A PROCESS WHICH COMPRISES CONDENSING 1-LOWER CARBALKOXY - METHYL-6,7-DI(LOWER ALKOXY)-1,2,3,4-TETRAHYDROISOQUINOLINE WITH A MEMBER OF THE GROUP CONSISTING OF FORMALDEHYDE AND A PARAFORMALDEHYDE AND WITH A-HYDROCARBYL-MALONIC ACID DIMETYL ESTER HY HEATING SAID REACTANTS TOGETHER THEREBY PRODUCING 1-LOWER CARBALKOXYMETHYL - 2 - (2,2 - DICARBOMETHOXY-2-HYDROCARBYL-ETHYL)6,7-DI(LOWER ALKOXY)-1,2,3,4-TETRAHYDROISOQUINOLINE, CYCLIZING THE LATTER BY HEATING WITH AN ALKALI METAL ALKOXIDE THEREBY PRODUCING 1-LOWER CARBALKOXY-2-OXO-3-CARBOMETHOXY - 3 - HYDROCARBYL-9,10-DI(LOWER ALKOXY)-1,2,3,4, 6,7-HEXAHYDRO-11B-BENZO(A) QUINOLIZINE, AND HYDROLYZING AND DECARBOXYLATING THE LATTER BY HEATING WITH AN AQUEOUS SOLUTION OF A MINERAL ACID THEREBY PRODUCING 2-OXO-3-HYDROCARBYL -9,10-DI(LOWER ALKOXY)-1,2,3,4,6,7-HEXAHYDRO11B-BENZO(A) QUINOLIZINE SAID HYDROCARBYL BEING A HYDROCARBON RADICAL HAVING LESS THAN EIGHT CARBON ATOMS.
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) | 1961-04-14 | 1961-10-14 | 1962-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-14 | 1965-10-14 | 1966-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-14 | 1969-10-14 | 1970-04-15 | $7700.00 | Window Closed / Lapsed |