US2847421A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ascorbic acid intermediates
Assignee: EIDP Inc
•
Filing: 1956-12-13
•
Granted: 1958-08-12
•
Expires: 1976-12-13
Abstract
No abstract record available.
Inventors
- 👤 Addieco Alfred A D
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:26
CPC Classifications
C; C07; C07H; C07H9/00; C07H9/02; C07H9/04; C07C; C07C59/00; C07C59/40; C07C59/76; C07C59/90
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2265121A
Cited
US2491065A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-11 | 1962-02-10 | 1962-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-11 | 1966-02-10 | 1966-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-11 | 1970-02-10 | 1970-08-12 | $7700.00 | Window Closed / Lapsed |