US2680741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing 3-aryl-2, 4-(1h, 3h)-quinazolinediones and their nitrogen heterocyclic analogs
Assignee: EIDP Inc
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Filing: 1952-03-07
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Granted: 1954-06-08
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Expires: 1972-03-07
Abstract
No abstract record available.
Inventors
- 👤 Walter W Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:21
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/70; C07D239/72; C07D239/95; C07D239/96
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A PROCESS WHICH COMPRISES REACTING, AT A TEMPERATURE OF AT LEAST 175* C. AND AT A PRESSURE OF AT LEAST 3300 ATMOSPHERES, CARBON DIOXIDE AND A MONONUCLEAR AROMATIC PRIMARY MONOAMINE SELECTED FROM THE CLASS CONSISTING OF MONONUCLEAR ARYL PRIMARY MONOAMINES AND MONONUCLEAR PYRIDINE PRIMARY MONOAMINES, SAID MONONUCLEAR AROMATIC PRIMARY MONOAMINE CONTAINING HYDROGEN IN AT LEAST ONE OF THE POSITIONS ORTHO TO THE AMINO GROUP WITH ANY NUCLEAR SUBSTITUENTS IN ADDITION TO THE PRIMARY AMINO GROUP BEING SELECTED FROM THE CLASS CONSISTING OF ALKYL, ALKOXY AND CARBOXY, AND SEPARATING FROM THE REACTION MIXTURE A COMPOUND SELECTED FROM THE CLASS CONSISTING OF 3ARYL-2,4-(1H,3H)-QUINAZOLINEDIONES AND THEIR NITROGEN HETEROCYCLIC ANALOGS.
Claim 2
Dependent Claim
106 words
A PROCESS WHICH COMPRISES REACTING, AT A TEMPERATURE OF AT LEAST 175* C. AND AT A PRESSURE OF AT LEAST 3300 ATMOSPHERES, CARBON DIOXIDE AND A MONONUCLEAR AROMATIC PRIMARY MONOAMINE SELECTED FROM THE CLASS CONSISTING OF MONONUCLEAR ARYL PRIMARY MONOAMINES AND MONONUCLEAR PYRIDINE PRIMARY MONOAMINES, SAID MONONUCLEAR AROMATIC PRIMARY MONOAMINE CONTAINING HYDROGEN IN AT LEAST ONE OF THE POSITIONS ORTHO TO THE AMINO GROUP WITH ANY NUCLEAR SUBSTITUENTS IN ADDITION TO THE PRIMARY AMINO GROUP BEING SELECTED FROM THE CLASS CONSISTING OF ALKYL, ALKOXY AND CARBOXY, AND SEPARATING FROM THE REACTION MIXTURE A COMPOUND SELECTED FROM THE CLASS CONSISTING OF 3ARYL-2,4-(1H,3H)-QUINAZOLINEDIONES AND THEIR NITROGEN HETEROCYCLIC ANALOGS.
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) | 1957-06-07 | 1957-12-07 | 1958-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-07 | 1961-12-07 | 1962-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-07 | 1965-12-07 | 1966-06-08 | $7700.00 | Window Closed / Lapsed |