Patent US2471697A successfully refreshed from Google Patents.
US2471697A
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Process for reducing carbonyl compounds to their corresponding methylene analogues
Assignee: Merck and Co Inc
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Filing: 1946-11-08
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Granted: 1949-05-31
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Expires: 1966-11-08
Abstract
No abstract record available.
Inventors
- 👤 Minlon Huang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:52
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/347; C07C51/373; C07C1/00; C07C1/20; C07C1/22; C07C43/00; C07C43/02; C07C43/20; C07C43/205; C07C43/2055; C07C51/377; C07C2601/00; C07C2601/12; C07C2601/14
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) | 1952-05-30 | 1952-11-29 | 1953-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-30 | 1956-11-29 | 1957-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-30 | 1960-11-29 | 1961-05-31 | $7700.00 | Window Closed / Lapsed |