US2651658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of compounds of phosgene
Assignee: Columbia Southern Chemical Corp
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Filing: 1949-07-30
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Granted: 1953-09-08
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Expires: 1969-07-30
Abstract
No abstract record available.
Inventors
- 👤 Lester E Bohl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:49
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/96; C07C271/00; C07C271/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
IN THE PROCESS OF PREPARING A CARBAMATE ESTER BY REACTING A HALOFORMATE WITH AN AMINE WHEREBY THE CARBAMATE ESTER CONTAINING HALOFORMATE HALOGEN AS AN IMPURITY IS OBTAINED, THE IMPROVEMENT WHICH COMPRISES REMOVING HALOFORMATE HALOGEN FROM THE CARBAMATE ESTER BY CONTACTING THE ESTER WITH A COMPOUND OF THE GROUP CONSISTING OF AMMONIA AND AMMONIUM COMPOUNDS WHICH WILL LIBERATE AMMONIA FOR REACTION WITH HCL, AND REMOVING THE RESULTANT HALIDE WHICH IS FORMED.
Claim 2
Dependent Claim
70 words
IN THE PROCESS OF PREPARING A CARBAMATE ESTER BY REACTING A HALOFORMATE WITH AN AMINE WHEREBY THE CARBAMATE ESTER CONTAINING HALOFORMATE HALOGEN AS AN IMPURITY IS OBTAINED, THE IMPROVEMENT WHICH COMPRISES REMOVING HALOFORMATE HALOGEN FROM THE CARBAMATE ESTER BY CONTACTING THE ESTER WITH A COMPOUND OF THE GROUP CONSISTING OF AMMONIA AND AMMONIUM COMPOUNDS WHICH WILL LIBERATE AMMONIA FOR REACTION WITH HCL, AND REMOVING THE RESULTANT HALIDE WHICH IS FORMED.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-07 | 1957-03-09 | 1957-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-07 | 1961-03-09 | 1961-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-07 | 1965-03-09 | 1965-09-08 | $7700.00 | Window Closed / Lapsed |