US3311655A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of urethanes
Assignee: Ministère des Armées
•
Filing: 1961-05-19
•
Granted: 1967-03-28
•
Expires: 1981-05-19
Abstract
No abstract record available.
Inventors
- 👤 Boileau Jacques
- 👤 Vaganay Jean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:18
CPC Classifications
C; C07; C07D; C07D263/00; C07D263/02; C07D263/30; C07D263/34; C07D263/44; C07D263/52; C07D277/00; C07D277/02; C07D277/20; C07D277/32; C07D277/34
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
9 words
A METHOD OF PREPARING A URETHANE OF THE FORMULA:
Claim 2
Independent Claim
9 words
A METHOD OF PREPARING A URETHANE OF THE FORMULA:
Claim 3
Independent Claim
105 words
A METHOD OF PREPARING THE 3-CHLOROPHENYLCARBAMATE OF ETHYL LACTATE COMPRISING MIXING METACHLOROANILINE IN AN INERT ORGANIC SOLVENT WITH ETHYL LACTATE AND PHOSGENE, AND HEATING THE MIXTURE CONTAINING THE THREE SAID REACTANTS FOR A FIRST PERIOD TO A TEMPERATURES OF -10* TO 20*C., THEN FOR A SECOND PERIOD TO A TEMPERATURE OF 45*-70*C., THE AMOUNT OF PHOSGENE BEING FROM 1.1 TO 5 MOLES AND THE AMOUNT OF ETHYL LACTATE BEING FROM 1.05 TO 3 MOLES PER MOLE OF THE METACHLOROANILINE, THE ETHYL LACTATE BEING PRESENT IN THE MIXTURE IN MOLAR EXCESS OF THE METACHLOROANILINE AT ALL TIMES, WHEREBY THE SAID 2CHLOROPHENYLCARBAMATE OF ETHYL LACTATE IS FORMED.
Claim 4
Independent Claim
105 words
A METHOD OF PREPARING THE 3-CHLOROPHENYLCARBAMATE OF ETHYL LACTATE COMPRISING MIXING METACHLOROANILINE IN AN INERT ORGANIC SOLVENT WITH ETHYL LACTATE AND PHOSGENE, AND HEATING THE MIXTURE CONTAINING THE THREE SAID REACTANTS FOR A FIRST PERIOD TO A TEMPERATURES OF -10* TO 20*C., THEN FOR A SECOND PERIOD TO A TEMPERATURE OF 45*-70*C., THE AMOUNT OF PHOSGENE BEING FROM 1.1 TO 5 MOLES AND THE AMOUNT OF ETHYL LACTATE BEING FROM 1.05 TO 3 MOLES PER MOLE OF THE METACHLOROANILINE, THE ETHYL LACTATE BEING PRESENT IN THE MIXTURE IN MOLAR EXCESS OF THE METACHLOROANILINE AT ALL TIMES, WHEREBY THE SAID 2CHLOROPHENYLCARBAMATE OF ETHYL LACTATE IS FORMED.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-27 | 1970-09-26 | 1971-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-27 | 1974-09-26 | 1975-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-27 | 1978-09-26 | 1979-03-28 | $7700.00 | Window Closed / Lapsed |