Impeding the extraction of active ingredients out of tabletsPatent US6197314 (http://l2.espacenet.com/dips/viewer?PN=US6197314&CY=gb&LG=en&DB=EPD)
Abstract
Solid oral administration forms from which the active ingredients can be isolated only with difficulty are described and comprise, besides conventional ingredients, as addition a mixture of pharmacologically suitable fats or gel formers with surfactants. Addition of the mixtures impedes extraction of the active ingredients out of the administration forms.
New to the Hive, meaning it hasn't been posted before. Plus three year old patents are the ones you'll start seeing in products today. It takes time to get this shit approved.