Sustained release preparation

Patent 4814176 Issued on March 21, 1989. Estimated Expiration Date:

March 21, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Sustained release pharmaceutical composition of solid medical material
Patent #: 4404183
Issued on: 09/13/1983
Inventor: Kawata , et al.

Pharmaceutical insertion compositions and a process for producing the same
Patent #: 4472376
Issued on: 09/18/1984
Inventor: Kamishita

Polyacrylic acid/chitosan polyelectrolyte complex
Patent #: 4501835
Issued on: 02/26/1985
Inventor: Berke

Novel pharmaceutical composition
Patent #: 4536495
Issued on: 08/20/1985
Inventor: Bergwitz-Larsen , et al.

Soft buccal
Patent #: 4572832
Issued on: 02/25/1986
Inventor: Kigasawa , et al.

Pharmaceutical multiple-units formulation
Patent #: 4606909
Issued on: 08/19/1986
Inventor: Bechgaard , et al.

Injector filled with an anti-cancer composition
Patent #: 4642111
Issued on: 02/10/1987
Inventor: Sakamoto , et al.

Controlled release formulation
Patent #: 4666705
Issued on: 05/19/1987
Inventor: DeCrosta , et al.

Delivery device for zero-order release of an active principle into a dissolution fluid and process for its preparation Patent #: 4681755
Issued on: 07/21/1987
Inventor: Colombo , et al.

Inventors

Assignee

Teijin Ltd.

Application

No. 06/817649 filed on 01/10/1986

US Classes:

424/457, Sustained or differential release424/468, Sustained or differential release type424/469, Discrete particles in supporting matrix424/470Where particles are granulated

Examiners

Primary: Rose, Shep K.

Attorney, Agent or Firm

Sughrue, Mion, Zinn, Macpeak & Seas

International Classes

A61K 9/20 (20060101)
A61K 9/48 (20060101)

Foreign Application Priority Data

1985-01-11 JP

Abstract

A sustained release preparation comprising:(a) chitin, chitosan, or a mixture thereof(b) anionic polymer compounds such as those having a carboxyl group, a sulfonic acid group, or a group capable of providing the same, and(c) pharmaceutically active agents.This sustained release preparation can provide the desired sustained-release or dissolution of the pharmaceutically active agents in human organs irrespective of the acidity (i.e., pH conditions) therein.