Patent US1646808A successfully refreshed from Google Patents.
Patent US2816897A successfully refreshed from Google Patents.
US2816897A
Expired / Lapsed
US
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Organic chemicals
Assignee: Ethyl Corp
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Filing: 1956-06-05
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Granted: 1957-12-17
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Expires: 1976-06-05
Abstract
No abstract record available.
Inventors
- 👤 Calvin N Wolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:02
CPC Classifications
C; C07; C07D; C07D209/00; C07D209/02; C07D209/44; C07D209/48; C07C; C07C243/00; C07C243/24; C07C243/36; C07C2603/00; C07C2603/02; C07C2603/04; C07C2603/06; C07C2603/10; C07C2603/12; C07C2603/16
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
7 words
AS A NEW COMPOSTITION OF MATTER N-AMINO-1,2,3,6TETRAHYDROPHTHALIMIDE.
References Cited (Backward Citations)
US2615862A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-16 | 1961-06-17 | 1961-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-16 | 1965-06-17 | 1965-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-16 | 1969-06-17 | 1969-12-17 | $7700.00 | Window Closed / Lapsed |