Patent US2172822A successfully refreshed from Google Patents.
US2172822A
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Isobutenyl amines and process of making them
Assignee: Shell Development Co
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Filing: 1937-02-01
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Granted: 1939-09-12
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Expires: 1957-02-01
Abstract
No abstract record available.
Inventors
- 👤 Miroslav W Tamele
- 👤 Herbert P A Groll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:19
CPC Classifications
C; C07; C07C; C07C211/00; C07C211/01; C07C211/02; C07C209/00; C07C209/04; C07C209/06; C07C209/08; C07C211/09; C07D; C07D295/00; C07D295/02; C07D295/027; C07D295/03; C10; C10M; C10M2215/00; C10M2215/24; C10M2215/26
Claims Analysis
Total Claims: 0
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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) | 1942-09-11 | 1943-03-13 | 1943-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-09-11 | 1947-03-13 | 1947-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-09-11 | 1951-03-13 | 1951-09-12 | $7700.00 | Window Closed / Lapsed |