The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 28, 2005
Filed:
Nov. 11, 1999
Torkel Gren, Kalamazoo, MI (US);
Anders Ringberg, Stockholm, SE;
Martin Wikberg, Kullavik, SE;
Randy J. Wald, Portage, MI (US);
Torkel Gren, Kalamazoo, MI (US);
Anders Ringberg, Stockholm, SE;
Martin Wikberg, Kullavik, SE;
Randy J. Wald, Portage, MI (US);
Pharmacia AB, Stockholm, SE;
Abstract
A controlled release bead comprises: (i) a core unit of a substantially water-soluble or water-swellable inert material; (ii) a first layer on the core unit of a substantially water-insoluble polymer; (iii) a second layer covering the first layer and containing an active ingredient; and (iv) a third layer of polymer on the second layer effective for controlled release of the active ingredient, wherein the first layer is adapted to control water penetration into the core. A method of producing the controlled release bead is also disclosed.