Patent US3769347A successfully refreshed from Google Patents.
US3769347A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of d,d'-2,2'-(ethylenediimino) di-1-butanol hydrochloride
Assignee: Wyeth Holdings LLC
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Filing: 1971-02-11
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Granted: 1973-10-30
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Expires: 1991-02-11
Abstract
Abstract IMPROVED QUANTITY AND QUALITY OF D,D''-2,2''-(ETHYLENEDIIMINO)DI-1-BUTANOL DIHYDROCHLORIDE FROM THE REACTION OF ETHYLENE DICHLORIDE AND AN EXCESS OF D-2-AMINO-1-BUTANOL ARE OBTAINED BY MIXING FINELY DIVIDED SODIUM HYDROXIDE WITH THE REACTION MIXTURE, DISTILLING OFF D-2-AMINO-1-BUTANOL, ADDING ISOPROPANOL OR OTHER 2-4 CARBON ALKANOL, SEPARATING SODIUM CHLORIDE, ADDING HC1, AND SEPARATING THE PRODUCT.
Inventors
- 👤 J Kazan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:46
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/185; A61K31/205; C; C07; C07C; C07C215/00; C07C215/02; C07C215/04; C07C215/06; C07C215/14
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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |