Patent US2817663A successfully refreshed from Google Patents.
US2817663A
Expired / Lapsed
US
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Preparation of 2-methyl oxazolidines and tetrahydro-1, 3-oxazines
Assignee: Rohm and Haas Co
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Filing: 1955-10-05
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Granted: 1957-12-24
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Expires: 1975-10-05
Abstract
No abstract record available.
Inventors
- 👤 Lawrence E Conlon
- 👤 Warren H Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:38
CPC Classifications
C; C07; C07D; C07D263/00; C07D263/02; C07D263/04; C07D265/00; C07D265/04; C07D265/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
9 words
A PROCESS FOR PREPARING CYCLIC COMPOUNDS OF THE STRUCTURE
Claim 2
Dependent Claim
9 words
A PROCESS FOR PREPARING CYCLIC COMPOUNDS OF THE STRUCTURE
References Cited (Backward Citations)
US2250408A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-23 | 1961-06-24 | 1961-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-23 | 1965-06-24 | 1965-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-23 | 1969-06-24 | 1969-12-24 | $7700.00 | Window Closed / Lapsed |