Patent · US Expired

System for the controlled release of active agents and a process for its preparation

US5840335A · kind A · utility

21Cited by

19References

20Claims

0Family size

Assignee

Prof. Dr. Udo Wenzel · DE

Inventors

Udo Wenzel · Bodenwerder, DE
Jurgen Metzner · Halle, BE
Thomas Rosin · Ankeny, US
Halvor Jaeger · Neu-Ulm, DE
Zoser B. Salama · Ravensburg, DE

Key dates

Filing date	Mar 23, 1995
Grant date	Nov 24, 1998
Priority date	—
Expiry date	Mar 23, 2015

Classification

Technology area (CPC A)Human Necessities
CPC primaryA61K9/2866
WIPO fieldPharmaceuticals
WIPO sectorChemistry

Abstract

A system for the controlled release of an active agent to an environment of use, said system having a predetermined release rate of the active agent to the environment of use, comprising: a) a shell comprised of a wall formed of a water-insoluble material which is permeable to the passage of an external fluid, and b) a core which is surrounded by said shell, said core comprised of i) a water-soluble active agent, and ii) a soluble polymeric adjuvant capable of unlimited swelling.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.