US4963364A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microencapsulated antitumor agent
Assignee: BAHN PETER FARMINGTON CT (50%) INTEREST
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Filing: 1989-04-10
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Granted: 1990-10-16
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Expires: 2009-04-10
Abstract
Abstract Thermally polymerized copolyamino acids are used to microencapsulate a chemotherapeutic compound for more efficient drug delivery.
Inventors
- 👤 Sidney W. Fox
- 👤 Robert W. Veltri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:14
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/70; A61K9/00; A61K9/14; A61K9/16; A61K9/1605; A61K9/1629; A61K9/1641
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
A microencapsulated drug delivery vehicle comprising the drug adriamycin enclosed within a thermal copolyamino acid microsphere wherein the said copolyamino acid was polymerized from a mixture of aspartic acid, glutamic acid, and histidine in a ratio of 1:2:4.
Claim 2
Dependent Claim
38 words
A microencapsulated drug delivery vehicle comprising the drug adriamycin enclosed within a thermal copolyamino acid microsphere wherein the said copolyamino acid was polymerized from a mixture of aspartic acid, glutamic acid, and histidine in a ratio of 1:2:4.
References Cited (Backward Citations)
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US3076790A
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US4873088A
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US4844904A
Cited
US4774320A
Cited
US4877611A
Cited
US4832686A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-15 | 1994-04-16 | 1994-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-15 | 1998-04-16 | 1998-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-15 | 2002-04-16 | 2002-10-16 | $7700.00 | Window Closed / Lapsed |