US 4,902,515 AGranted

Polylactide compositions

AssigneeE. I. DuPont de Nemours and Company

InventorsGary L. Loomis, Joseph R. Murdoch

Life of this patent

Estimating the term…

Abstract

Systems for delivery of biologically active materials employing novel polylactide composition containing segments of poly(R-lactide) interlocked with segments of poly(S-lactide) as the carrier.

Claims4

Dependent claims

A process for encapsulating a biologically active ingredient in interlocked segments of poly(R-lactide) and poly(S-lactide) which comprises intimately contacting segments of poly(R-lactide) and poly(S-lactide) at a temperature below the melting temperature of the highest melting phase in the presence of the biologically active compound until interlocking occurs.

Dependencies are inferred from the claim text.

Facts

Application: 07/256,471Filed 12 Oct 1988 · continuation in part
Priority: 22 Dec 1986
Granted: 20 Feb 1990
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

C08G 63/08
Derived from hydroxycarboxylic acids: lactones or lactides
A61K 9/1647
Obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polyethylene glycol, poloxamers: polyesters, e.g. poly
C08L 67/04
Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain ; Compositions of derivatives of such polymers:…
C08G
Macromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds

Family

Serial944,588Parent of this division · filed 22 Dec 1986
Serial108,531Parent of this division · filed 15 Oct 1987
Serial187,350Parent of this continuation-in-part · filed 28 Apr 1988
US 4,800,219 AParent of this continuation-in-part
US 4,766,182 AParent of this division
US 4,719,246 AParent of this division
US 4,902,515 AThis patent

From the US filing history. Foreign family members aren’t listed.

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Abstract

Systems for delivery of biologically active materials employing novel polylactide composition containing segments of poly(R-lactide) interlocked with segments of poly(S-lactide) as the carrier.

Facts

Application

07/256,471Filed 12 Oct 1988 · continuation in part

Priority

22 Dec 1986

Granted

20 Feb 1990

Term ends

Not estimatedThe source records don’t support an estimate.

Classification6 codes

C08G 63/08
Derived from hydroxycarboxylic acids: lactones or lactides
A61K 9/1647
Obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polyethylene glycol, poloxamers: polyesters, e.g. poly
C08L 67/04
Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain ; Compositions of derivatives of such polymers:…
C08G
Macromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds

Family

Serial944,588Parent of this division · filed 22 Dec 1986

Serial108,531Parent of this division · filed 15 Oct 1987

Serial187,350Parent of this continuation-in-part · filed 28 Apr 1988

US 4,800,219 AParent of this continuation-in-part

US 4,766,182 AParent of this division

US 4,719,246 AParent of this division

US 4,902,515 AThis patent

From the US filing history. Foreign family members aren’t listed.