US2776979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
1-nitroso-2-imidazolidone and process
Assignee: Warner Chilcott Pharmaceuticals Inc
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Filing: 1956-04-05
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Granted: 1957-01-08
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Expires: 1976-04-05
Abstract
No abstract record available.
Inventors
- 👤 Julian G Michels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:18
CPC Classifications
C; C07; C07D; C07D405/00; C07D405/02; C07D405/12; C07D233/00; C07D233/04; C07D233/28; C07D233/30; C07D233/32; C07D233/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
THE METHOD OF PREPARING 1-AMINO-2-IMIDAZOLIDONE WHICH COMPRISES NITROSATING 2-IMIDAZOLIDONE BY DISSOLVING SAID 2-IMIDAZOLIDONE IN HYDROCHLORIC ACID AND SLOWLY ADDING SODIUM NITRITE THERETO AT A TEMPERATURE OF ABOUT 0* TO 5* C. TO PRODUCE 1-NITROSO-2-INIDAZOLIDONE, AND THEN REDUCING SAID 1-NITROSO-2-IMIDAZOLIDONE BY DISSOLVING THE SAME IN DILUTE MINERAL ACID AND ADDING ZINC DUST THERETO.
Claim 2
Independent Claim
52 words
THE METHOD OF PREPARING 1-AMINO-2-IMIDAZOLIDONE WHICH COMPRISES NITROSATING 2-IMIDAZOLIDONE BY DISSOLVING SAID 2-IMIDAZOLIDONE IN HYDROCHLORIC ACID AND SLOWLY ADDING SODIUM NITRITE THERETO AT A TEMPERATURE OF ABOUT 0* TO 5* C. TO PRODUCE 1-NITROSO-2-INIDAZOLIDONE, AND THEN REDUCING SAID 1-NITROSO-2-IMIDAZOLIDONE BY DISSOLVING THE SAME IN DILUTE MINERAL ACID AND ADDING ZINC DUST THERETO.
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) | 1960-01-08 | 1960-07-09 | 1961-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-08 | 1964-07-09 | 1965-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-08 | 1968-07-09 | 1969-01-08 | $7700.00 | Window Closed / Lapsed |