Patent US2648664A successfully refreshed from Google Patents.
US2648664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
4,4,6-trimethyl-2-(1-hydroxyethyl)-5,6-dihydro-1,3-4h-oxazine
Assignee: United States Department of Agriculture
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Filing: 1951-03-23
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Granted: 1953-08-11
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Expires: 1971-03-23
Abstract
No abstract record available.
Inventors
- 👤 William P Ratchford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:07
CPC Classifications
C; C07; C07D; C07D265/00; C07D265/04; C07D265/06; C07D265/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
THE COMPOUND HAVING THE FORMULA:
Claim 2
Dependent Claim
5 words
THE COMPOUND HAVING THE FORMULA:
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) | 1956-08-10 | 1957-02-09 | 1957-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-10 | 1961-02-09 | 1961-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-10 | 1965-02-09 | 1965-08-11 | $7700.00 | Window Closed / Lapsed |