Patent US4766358A successfully refreshed from Google Patents.
Patent US2454749A successfully refreshed from Google Patents.
US2454749A
Expired / Lapsed
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Lower alkyl esters of ascorbic acid
Assignee: Pharmacia and Upjohn Co
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Filing: 1945-03-16
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Granted: 1948-11-23
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Expires: 1965-03-16
Abstract
No abstract record available.
Inventors
- 👤 Edwin C Wise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:05
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/34; C07D307/56; C07D307/62
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1478498A
Cited
DE639776C
Cited
GB460586A
Cited
US2207680A
Cited
US2150140A
Cited
US2185383A
Cited
US2350435A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-23 | 1952-05-24 | 1952-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-23 | 1956-05-24 | 1956-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-23 | 1960-05-24 | 1960-11-23 | $7700.00 | Window Closed / Lapsed |