Patent US4572369A successfully refreshed from Google Patents.
US2868801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of substituted
Assignee: —
•
Filing: —
•
Granted: 1959-01-13
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Expires: 1976-01-13
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:06
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
55 words
A PROCESS FOR THE PRODUCTION OF SUBSTITUTED OXAZOLIDONES WHICH COMPRISES REACTING AN ALIPHATIC SECONDARY AMINE CONTAINING AT LEAST ONE 2-HYDROXYPROPYL GROUP AND CARBON DIOXIDE AT AN ELEVATED TEMPERATURE IN THE RANGE OF FROM 120* C. TO 175* C. UNDER A SUPERATMOSPHERIC PRESSURE IN THE RANGE OF FROM 175 TO 700 POUNDS PER SQUARE INCH ABSOLUTE.
Claim 2
Dependent Claim
55 words
A PROCESS FOR THE PRODUCTION OF SUBSTITUTED OXAZOLIDONES WHICH COMPRISES REACTING AN ALIPHATIC SECONDARY AMINE CONTAINING AT LEAST ONE 2-HYDROXYPROPYL GROUP AND CARBON DIOXIDE AT AN ELEVATED TEMPERATURE IN THE RANGE OF FROM 120* C. TO 175* C. UNDER A SUPERATMOSPHERIC PRESSURE IN THE RANGE OF FROM 175 TO 700 POUNDS PER SQUARE INCH ABSOLUTE.
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) | 1962-01-12 | 1962-07-14 | 1963-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-12 | 1966-07-14 | 1967-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-12 | 1970-07-14 | 1971-01-13 | $7700.00 | Window Closed / Lapsed |