US2701246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing a cyclic carbamate
Assignee: Wyeth Holdings LLC
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Filing: 1953-08-04
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Granted: 1955-02-01
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Expires: 1973-08-04
Abstract
No abstract record available.
Inventors
- 👤 Erhart K Drechsel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:47
CPC Classifications
C; C07; C07D; C07D265/00; C07D265/04; C07D265/06; C07D265/08; C07D265/10; C07D263/00; C07D263/02; C07D263/08; C07D263/16; C07D263/18; C07D263/20; C07D263/22; C08; C08L; C08L75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
31 words
THE METHOD OF PREPARING 2-KETOTETRAHYDRO-3-OXAZINE WHICH COMPRISES EFFECTING ALCOHOLYSIS OF N-(3-HYDROXYPROPYL)-0-LOWER ALKYL CARBONATE AT A TEMERATURE OF FROM 40* C. TO 200* C., AND ISOLATING 2-KETOTETRAHYDR-1.3-OXAZINE FROM TH RESULTING REACTION MASS.
Claim 2
Independent Claim
31 words
THE METHOD OF PREPARING 2-KETOTETRAHYDRO-3-OXAZINE WHICH COMPRISES EFFECTING ALCOHOLYSIS OF N-(3-HYDROXYPROPYL)-0-LOWER ALKYL CARBONATE AT A TEMERATURE OF FROM 40* C. TO 200* C., AND ISOLATING 2-KETOTETRAHYDR-1.3-OXAZINE FROM TH RESULTING REACTION MASS.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-01-31 | 1958-08-02 | 1959-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-31 | 1962-08-02 | 1963-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-31 | 1966-08-02 | 1967-02-01 | $7700.00 | Window Closed / Lapsed |