Patent US2472837A successfully refreshed from Google Patents.
US2472837A
Expired / Lapsed
US
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Separation of organic compounds
Assignee: MW Kellogg Co
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Filing: 1947-02-27
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Granted: 1949-06-14
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Expires: 1967-02-27
Abstract
No abstract record available.
Inventors
- 👤 Charles C King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:11
CPC Classifications
C; C07; C07C; C07C9/00; C07C9/14; C07C29/00; C07C29/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-13 | 1952-12-13 | 1953-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-13 | 1956-12-13 | 1957-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-13 | 1960-12-13 | 1961-06-14 | $7700.00 | Window Closed / Lapsed |