Patent US4221732A successfully refreshed from Google Patents.
US4221732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Structural analogs of natural phospholipids
Assignee: A Natterman und Cie GmbH
•
Filing: 1979-05-11
•
Granted: 1980-09-09
•
Expires: 1999-05-11
Abstract
Abstract Structural analogs of natural phospholipids of the general formulae ##STR1## where R 1 and R 2 represent either hydrogen and/or saturated or unsaturated straight-chain and branched acyl radicals with 2 to 24 C-atoms and R 3 an amino group or a substituted amino group of the formula ##STR2## and n is a number from 1-3, are useful in the preparation of stable liposomes useful as vehicles for pharmaceutical preparations.
Inventors
- 👤 Kurt Oette
- 👤 Tschae S. Tschung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:25
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/09; C07F9/10; A; A61; A61K; A61K9/00; A61K9/10; A61K9/127; A61K9/1271; A61K9/1272; A61P; A61P29/00; A61P35/00; A61P37/00; A61P37/02; A61P37/06; A61P43/00; A61P7/00; A61P7/02; A61P9/00; A61P9/10; C07F9/091
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
59 words
A structural analog of natural phospholipids selected from the group consisting of compounds of the formulae: ##STR11## wherein R 1 and R 2 are either hydrogen and/or saturated or unsaturated straight-chain and branched anyl radicals with 2 to 24 C-atoms; R 3 is an amino group or a substituted amino group of the formula ##STR12## and n is 1-3.
Claim 2
Dependent Claim
59 words
A structural analog of natural phospholipids selected from the group consisting of compounds of the formulae: ##STR11## wherein R 1 and R 2 are either hydrogen and/or saturated or unsaturated straight-chain and branched anyl radicals with 2 to 24 C-atoms; R 3 is an amino group or a substituted amino group of the formula ##STR12## and n is 1-3.
Claim 3
Dependent Claim
27 words
A structural analog according to claim 1, characterized by the fact that the acyl radical or radicals are palmitic-, stearic-, oleic-, linoleic-, linolenic- or arachidonic acid radicals.
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) | 1983-09-09 | 1984-03-10 | 1984-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-09 | 1988-03-10 | 1988-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-09 | 1992-03-10 | 1992-09-09 | $7700.00 | Window Closed / Lapsed |