Slow-releasing granules and long acting mixed granules comprising the same
Patent 4971805 Issued on November 20, 1990. Estimated Expiration Date: 
August 25, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 25, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2410417 Formulations providing three distinct releases Patent #: 4794001 InventorsAssigneeApplicationNo. 255199 filed on 08/25/1988US Classes:424/494, Cellulose derivatives424/458, Containing discrete coated particles pellets, granules, or beads424/459, Organic coatings424/462, Containing solid synthetic polymers424/468, Sustained or differential release type424/480, Cellulose or derivative424/482, Containing solid synthetic polymers424/497Containing solid synthetic polymersExaminersPrimary: Page, Thurman K.Attorney, Agent or FirmForeign Patent References
International ClassA61K 009/58Foreign Application Priority Data1987-12-23 WOAbstractSlow-releasing granules which are characterized by coating the quick-releasing granules which comprise an active ingredient, polyvinyl pyrrolidone polymer and a disintegrator where the polymer distributes in high concentration on the surface area of the granules, with a polyacid enteric material to form a complex between the polyvinyl pyrrolidone polymer and the polyacid, and long lasting mixed granules which comprise the quick-releasing granules and the slow-releasing granules, thus showing increased bioavailability of the active ingredient and high stability sustained for a long period of time. | |
