Patent US2925422A successfully refreshed from Google Patents.
US2925422A
Expired / Lapsed
US
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Certain 3, 4-dicyano, 6-oxy pyridones-2, corresponding iminopyrans and processes of preparation
Assignee: EIDP Inc
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Filing: 1957-04-18
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Granted: 1960-02-16
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Expires: 1977-04-18
Abstract
No abstract record available.
Inventors
- 👤 Clifford L Dickinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:50
CPC Classifications
C; C07; C07D; C07D309/00; C07D309/32; C07D211/00; C07D211/04; C07D211/80; C07D211/84; C07D211/90; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/78; C07D213/84; C07D213/85; C07D215/00; C07D215/02; C07D215/16; C07D215/48; C07D215/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
COMPOUNDS SELECTED FROM THE CLASS CONSISTING OF THOSE REPRESENTED BY THE FORMULA
Claim 2
Dependent Claim
12 words
COMPOUNDS SELECTED FROM THE CLASS CONSISTING OF THOSE REPRESENTED BY THE FORMULA
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-02-15 | 1963-08-17 | 1964-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-15 | 1967-08-17 | 1968-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-15 | 1971-08-17 | 1972-02-16 | $7700.00 | Window Closed / Lapsed |