US4448765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liposomes and their use in treating human or other mammalian patients
Assignee: BTG International Ltd
•
Filing: 1979-07-03
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Granted: 1984-05-15
•
Expires: 1999-07-03
Abstract
Abstract Microvesicles are stabilized by the incorporation of a polymer having aliphatic lipophilic groups with a chain of at least six atoms attached to the backbone thereof. Such microvesicles may incorporate a physiologically active substance such as an antigenic material, an anti-inflammatory agent, a hormone, etc.
Inventors
- 👤 Philip S. Ash
- 👤 Robert C. Hider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:49
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/10; A61K9/127; A61K9/1271; Y; Y10; Y10S; Y10S424/00; Y10S424/812; Y10S436/00; Y10S436/829; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985; Y10T428/2987
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
66 words
Liposomes incorporating a polymer having aliphatic lipophilic groups with a chain of at least six atoms attached to the backbone thereof and having a molecular weight of from 2,000 to 50,000 wherein the proportion of polymer to the lipid content of the liposomes is in a range from 1 part by weight of the polymer to from 10 to 1,000 parts by weight of the lipid.
Claim 2
Dependent Claim
66 words
Liposomes incorporating a polymer having aliphatic lipophilic groups with a chain of at least six atoms attached to the backbone thereof and having a molecular weight of from 2,000 to 50,000 wherein the proportion of polymer to the lipid content of the liposomes is in a range from 1 part by weight of the polymer to from 10 to 1,000 parts by weight of the lipid.
Claim 3
Dependent Claim
17 words
Liposomes according to claim 1, wherein the lipophilic groups have a chain of at least twelve atoms.
Claim 4
Dependent Claim
19 words
Liposomes according to claim 1, wherein the lipophilic groups have a chain of up to and including thirty atoms.
Claim 5
Dependent Claim
31 words
Liposomes according to claim 1 wherein the lipophilic groups comprise a chain of carbon atoms and the residue of a functional grouping through which this is attached to the polymer backbone.
Claim 6
Dependent Claim
19 words
Liposomes according to claim 4, wherein the chain of carbon atoms is the residue of a straight chain hydrocarbon.
Claim 7
Dependent Claim
23 words
Liposomes according to claim 5, wherein the chain of carbon atoms is a n-tridecyl, n-tetradecyl, n-pentadecyl, n-hexadecyl, n-heptadecyl, n-octadecyl, oleyl, or n-nonadecyl group.
Claim 8
Dependent Claim
13 words
Liposomes according to claim 4 wherein the functional residue is an oxycarbonyl group.
Claim 9
Dependent Claim
15 words
Liposomes according to claim 1, wherein the polymer backbone comprises a chain of carbon atoms.
Claim 10
Dependent Claim
19 words
Liposomes according to claim 1, wherein the polymer is a derivative of polyvinyl alcohol, polyacrylic acid or polymethacrylic acid.
Claim 11
Dependent Claim
22 words
Liposomes according to claim 9, wherein the polymer is an ester derivative, being a polyvinyl alcohol ester, a polyacrylate or a polymethacrylate.
Claim 12
Dependent Claim
28 words
Liposomes according to claim 10, wherein the polymer is n-tetradecyl- polyacrylate or polymethacrylate, n-hexadecyl- polyacrylate or polymethacrylate, n-octadecyl- polyacrylate or polymethacrylate, polyvinyl myristate, polyvinyl palmitate, or polyvinyl stearate.
Claim 13
Dependent Claim
40 words
Liposomes according to claim 1, wherein the proportion of polymer to the lipid content of the microvesicles is in a range from 1 part by weight of the polymer to from 20 to 200 parts by weight of the lipid.
Claim 14
Dependent Claim
27 words
Liposomes according to claim 1, wherein the lipid content of the liposomes is substantially comprised of lipids having aliphatic chains of from fourteen to eighteen carbon atoms.
Claim 15
Dependent Claim
17 words
Liposomes according to claim 1, wherein the polymer has a molecular weight of from 5,000 to 40,000.
Claim 16
Dependent Claim
13 words
A composition comprising liposomes according to claim 1 incorporating a physiologically active substance.
Claim 17
Dependent Claim
15 words
A composition according to claim 15, wherein the physiologically active substance is an antigenic material.
Claim 18
Dependent Claim
15 words
A composition according to claim 15, wherein the physiologically active substance is an anti-inflammatory agent.
Claim 19
Dependent Claim
14 words
A composition according to claim 15, wherein the physiologically active substance is a hormone.
Claim 20
Dependent Claim
16 words
A composition according to claim 15, wherein the liposomes carry a neutral or negative surface charge.
Claim 21
Dependent Claim
32 words
A method for the treatment of a human or other mammalian patient with a physiologically active substance which comprises administering said substance to the patient incorporated with liposomes according to claim 1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-15 | 1987-11-14 | 1988-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-15 | 1991-11-14 | 1992-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-15 | 1995-11-14 | 1996-05-15 | $7700.00 | Window Closed / Lapsed |