Patent US3624162A successfully refreshed from Google Patents.
US3624162A
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US
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Process for making 4,4{40 -dihydroxy stilbenes
Assignee: Wacker Chemie AG
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Filing: 1967-08-15
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Granted: 1971-11-30
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Expires: 1987-08-15
Abstract
Abstract This invention relates to 4,4'' -dihydroxy stilbenes, and it has for its object to provide a simple and efficient process for making such compounds.
Inventors
- 👤 Rolf Sieber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:41
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/11; C07C37/20; C07C37/001; C07C37/002
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
23 words
Process according to claim 1, characterized by the fact that the monochloro or monobromo acetaldehyde is used in the form of an acetal.
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) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |