Patent US3686249A successfully refreshed from Google Patents.
US3686249A
Expired / Lapsed
US
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Method of preparing aluminum complexes of polyhydroxy compounds
Assignee: Zeneca Inc
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Filing: 1970-04-24
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Granted: 1972-08-22
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Expires: 1990-04-24
Abstract
Abstract ALUMIUM COMPLEXES OF POLYLYDROXY COMPOUNDS ARE PREPARED BY REACTING AN ALUMINUM ALKOXIDE WITH A POLYHYDROXY COMPOUND SUCH AS SORBITOL IN THE PRESENCE OF A MINIMUM AMOUNT OF WATER FOLLOWED BY DRYING AND STRIPPING UNDER LESS THAN ABOUT 1 MM. HG.
Inventors
- 👤 Ludwig A Hartmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:54
CPC Classifications
C; C07; C07F; C07F5/00; C07F5/06; C07F5/069
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) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |