Sustained release preparation
Patent 4755544 Issued on July 5, 1988. Estimated Expiration Date: 
June 4, 2006. 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.
June 4, 2006. 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 ReferencesSustained release pharmaceutical capsules Mixture of hydroxypropylcellulose and poly(maleic anhydride/alkene-1) as a hydrocolloid gelling agent Controlled release tablet Osmotic device with wall comprising cellulose ether and permeability enhancer Anticalculus oral composition Patent #: 4627977 InventorsAssigneeApplicationNo. 06/870480 filed on 06/04/1986US Classes:524/42, Ether group containing, other than solely linking carbohydrate groups directly to each other424/418, Protein or derivative or polysaccharide or derivative424/419, Natural or synthetic resin424/422, Implant or insert424/461, Containing polysaccharide (e.g., cellulose sugars, etc.)424/462, Containing solid synthetic polymers424/468, Sustained or differential release type524/43, Hydroxyalkyl524/44HydroxyethylExaminersPrimary: Phillips, Delbert R.Assistant: Nutter, Nathan M. Attorney, Agent or FirmInternational ClassesA61K 9/20 (20060101)A61K 9/48 (20060101) Foreign Application Priority Data1985-06-04 JPAbstractA sustained release preparation comprising:(a) a non-anionic cellulose ether(b) a methoxyethylene-maleic anhydride copolymer or the hydrolyzate thereof, and(c) pharmaceutically active agents.This sustained release preparation can provide the desired sustained-release or dissolution of the pharmaceutically active agents in human organs irrespective of the acidity (i.e., pH conditions) therein. | |
