Patent US2354932A successfully refreshed from Google Patents.
US1985457A
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Separation of ethylene and preparation of alkyl halides from olefine mixtures
Assignee: Dow Chemical Co
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Filing: 1931-10-30
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Granted: 1934-12-25
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Expires: 1951-10-30
Abstract
No abstract record available.
Inventors
- 👤 Howard S Nutting
- 👤 Peter S Patrie
- 👤 Donald H Croope
- 👤 Myron E Huscher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:57
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/07; C07C17/08; C07C7/00; C07C7/148; C07C7/17
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) | 1937-12-24 | 1938-06-25 | 1938-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-12-24 | 1942-06-25 | 1942-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-12-24 | 1946-06-25 | 1946-12-25 | $7700.00 | Window Closed / Lapsed |