Patent US2452797A successfully refreshed from Google Patents.
US2452797A
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US
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Stripping of acetaldehyde from aldol by hydrocarbon vapors
Assignee: U S Ind Chemicals Inc
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Filing: 1944-05-29
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Granted: 1948-11-02
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Expires: 1964-05-29
Abstract
No abstract record available.
Inventors
- 👤 Henry B Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:20
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/78; C07C45/783; C07C45/81
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB191222621A
Cited
US1885242A
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US2000043A
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US2170854A
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US2251081A
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US2259951A
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US2368904A
Cited
US2372540A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-02 | 1952-05-03 | 1952-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-02 | 1956-05-03 | 1956-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-02 | 1960-05-03 | 1960-11-02 | $7700.00 | Window Closed / Lapsed |