US3704254A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for separating phosphatides
Assignee: Lever Brothers Co
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Filing: 1968-11-27
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Granted: 1972-11-28
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Expires: 1988-11-27
Abstract
Abstract N-ACYLPHOSPHATIDES, FOR INSTANCE N-ACETYLCEPHALIN, ARE SEPARATED FROM PHOSPHATIDES WITHOUT AN ACYLATABLE AMINO GROUP, FOR INSTANCE LECITHIN, BY MAKING A MIXTURE CONTAINING THEM BASIC WITH A NITROGEN BASE, FOR EXAMPLE TRIETHYLAMINE, TO THE EQUIVALENT OF PH AT LEAST 8.5 UNDER AQUEOUS CONDITIONS AND SOLVENT-FRACTIONATING WITH ACETONE OR METHYL ACETATE.
Inventors
- 👤 Rajindra Aneja
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:58
CPC Classifications
A; A23; A23J; A23J7/00; C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/09; C07F9/10; C07F9/103
Claims Analysis
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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) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |