Pharmaceutical compositions for controlled release of active substances
US6699502B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 29, 1999 |
| Grant date | Mar 2, 2004 |
| Priority date | — |
| Expiry date | Dec 27, 2021 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61P29/00
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The present invention is directed a pharmaceutical composition which can be administered orally, allowing for the controlled release of at least one active substance. The composition includes at least one active substance, between 5 and 60% by weight, relative to the total weight of the composition, of at least one excipient, selected from inert matrices, hydrophilic matrices, lipid matrices, mixtures of inert matrices and of lipid matrices, and mixtures of hydrophilic matrices and of inert matrices, with the exception of mixtures including a polyacrylic acid and at least one hydrophilic matrix of the cellulose type; and between 5 and 50% by weight, relative to the total weight of the composition, of at least one alkalinizing agent soluble in an aqueous phase under physiological pH conditions, selected from alkali or alkaline-earth metal hydroxides, carbonates, bicarbonates, phosphates, sodium borate and basic salts of organic acids. The invention further includes a process for preparation of the composition, multi-layered pharmaceutical compositions including at least one layer of the inventive composition, and processes for producing same.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.