US4330534A
Expired / Lapsed
US
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N4 -Acylcytosine arabinoside compositions
Assignee: Asahi Kasei Corp
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Filing: 1980-07-16
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Granted: 1982-05-18
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Expires: 2000-07-16
Abstract
Abstract A N 4 -acylcytosine arabinoside preparation which consists essentially of (a) a liposome of lecithin and (b) a N 4 -acylcytosine arabinoside having a C 6-18 aliphatic acyl group and being encapsulated in the liposome.
Inventors
- 👤 Yoshio Sakurai
- 👤 Tateshi Kataoka
- 👤 Fujiko Oh-hashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:49
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/70; A61K9/00; A61K9/10; A61K9/127; A61P; A61P35/00; A61P35/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
44 words
A N 4 -acylcytosine arabinoside composition which consists essentially of (a) a liposome of lecithin and (b) a N 4 -acylcytosine arabinoside having a C 6-18 aliphatic acyl group encapsulated in the liposome, said composition containing no substantial amount of stearylamine or dicetyl phosphate.
Claim 2
Dependent Claim
44 words
A N 4 -acylcytosine arabinoside composition which consists essentially of (a) a liposome of lecithin and (b) a N 4 -acylcytosine arabinoside having a C 6-18 aliphatic acyl group encapsulated in the liposome, said composition containing no substantial amount of stearylamine or dicetyl phosphate.
Claim 3
Dependent Claim
16 words
The N 4 -acylcytosine arabinoside composition of claim 1, wherein the liposome of lecithin contains cholesterol.
Claim 4
Dependent Claim
28 words
The N 4 -acylcytosine arabinoside composition of claim 1, wherein the aliphatic acyl group is selected from the group of caproyl, caprylyl, capryl, lauroyl, myristoyl, palmitoyl and stearoyl.
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) | 1985-05-17 | 1985-11-16 | 1986-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-17 | 1989-11-16 | 1990-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-17 | 1993-11-16 | 1994-05-18 | $7700.00 | Window Closed / Lapsed |