US2755286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing oxazolidones
Assignee: Jefferson Chemical Co Inc
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Filing: 1954-04-15
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Granted: 1956-07-17
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Expires: 1974-04-15
Abstract
No abstract record available.
Inventors
- 👤 Jr John Barr Bell
- 👤 Malkemus John David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:31
CPC Classifications
C; C07; C07D; C07D263/00; C07D263/02; C07D263/08; C07D263/16; C07D263/18; C07D263/20; C07D263/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A PROCESS FOR PREPARING 2-OXAZOLIDONE WHICH COMPRISES HEATING N-(2-HYDROXYETHYL) 2-HYDROXYETHYL CARBAMATE WITH REFLUXING AT A TEMPERATURE BETWEEN ABOUT 85-190* C. AND A PRESSURE BELOW ABOUT 20 MM. OF MERCURY FOR AT LEAST TWO HOURS AND UNTIL TRANSESTERIFICATION HAS BEEN EFFECTED TO PRODUCE A MIXTURE OF 2-OXAZOLIDONE AND ETHYLENE GLYCOL, AND SEPARATING SAID ETHYLENE GLYCOL TO PRODUCE 2-OXAZOLIDONE.
Claim 2
Dependent Claim
57 words
A PROCESS FOR PREPARING 2-OXAZOLIDONE WHICH COMPRISES HEATING N-(2-HYDROXYETHYL) 2-HYDROXYETHYL CARBAMATE WITH REFLUXING AT A TEMPERATURE BETWEEN ABOUT 85-190* C. AND A PRESSURE BELOW ABOUT 20 MM. OF MERCURY FOR AT LEAST TWO HOURS AND UNTIL TRANSESTERIFICATION HAS BEEN EFFECTED TO PRODUCE A MIXTURE OF 2-OXAZOLIDONE AND ETHYLENE GLYCOL, AND SEPARATING SAID ETHYLENE GLYCOL TO PRODUCE 2-OXAZOLIDONE.
References Cited (Backward Citations)
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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) | 1959-07-17 | 1960-01-16 | 1960-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-17 | 1964-01-16 | 1964-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-17 | 1968-01-16 | 1968-07-17 | $7700.00 | Window Closed / Lapsed |