Patent US2841591A successfully refreshed from Google Patents.
US2841591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of phthalimidines
Assignee: EIDP Inc
•
Filing: 1952-06-18
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Granted: 1958-07-01
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Expires: 1972-06-18
Abstract
No abstract record available.
Inventors
- 👤 William W Prichard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:22
CPC Classifications
C; C07; C07D; C07D209/00; C07D209/02; C07D209/44; C07D209/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
15 words
PROCESS OF PREPARING AN N-SUBSTITUTED PHTHALIMIDINE WHICH COMPRISES REACTING AN AROMATIC KETALDIMINE OF THE FORMULA
Claim 2
Dependent Claim
15 words
PROCESS OF PREPARING AN N-SUBSTITUTED PHTHALIMIDINE WHICH COMPRISES REACTING AN AROMATIC KETALDIMINE OF 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) | 1961-06-30 | 1961-12-30 | 1962-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-30 | 1965-12-30 | 1966-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-30 | 1969-12-30 | 1970-07-01 | $7700.00 | Window Closed / Lapsed |