Patent · US Expired

Process for time-controlled release of active ingredients

US4608248A · kind A · utility

22Cited by

12References

2Claims

0Family size

Assignee

WARNER-LAMBERT COMPANY LLC · US

Inventors

Adolf Knecht · Mainz, DE
Helmut Augart · Waldkirch, DE

Key dates

Filing date	Feb 24, 1986
Grant date	Aug 26, 1986
Priority date	—
Expiry date	Feb 24, 2006

Classification

Technology area (CPC A)Human Necessities
CPC primaryA61K9/2054
WIPO fieldPharmaceuticals
WIPO sectorChemistry

Abstract

The present invention provides a process for the timed control of the liberation of active material from a retarded active material-containing composition by the addition of a hydrophilic polymer, wherein the rate of liberation is adjusted by means of the viscosity of the added hydrophilic polymer, the rate of liberation increasing with increasing viscosity.

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