Patent US2444589A successfully refreshed from Google Patents.
US2444589A
Expired / Lapsed
US
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Purification of organic nitriles
Assignee: Wyeth Holdings LLC
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Filing: 1945-08-10
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Granted: 1948-07-06
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Expires: 1965-08-10
Abstract
No abstract record available.
Inventors
- 👤 William A Blann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:12
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/32; C07C253/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR805092A
Cited
US2191853A
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US2223930A
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US2301669A
Cited
US2191365A
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US2230641A
Cited
US2240116A
Cited
US2341907A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-07-06 | 1952-01-05 | 1952-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-07-06 | 1956-01-05 | 1956-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-07-06 | 1960-01-05 | 1960-07-06 | $7700.00 | Window Closed / Lapsed |