Patent US3892508A successfully refreshed from Google Patents.
Patent US2597965A successfully refreshed from Google Patents.
US2597965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
4-dialkylaminophthalic anhydride
Assignee: NCR Voyix Corp
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Filing: 1950-04-29
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Granted: 1952-05-27
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Expires: 1970-04-29
Abstract
No abstract record available.
Inventors
- 👤 Clyde S Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:59
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/77; C07D307/87; C07D307/89; C07D307/88
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
THE COMPOUNDS HAVING THE STRUCTURE
Claim 2
Dependent Claim
5 words
THE COMPOUNDS HAVING THE STRUCTURE
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) | 1955-05-27 | 1955-11-26 | 1956-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-27 | 1959-11-26 | 1960-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-27 | 1963-11-26 | 1964-05-27 | $7700.00 | Window Closed / Lapsed |