Time-controlled explosion systems and processes for preparing the same
Patent 4871549 Issued on October 3, 1989. Estimated Expiration Date: 
October 3, 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.
October 3, 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 ReferencesProlonged release therapeutic compositions based on hydroxypropylmethylcellulose Sustained absorption pharmaceutical composition Sustained release tablet Patent #: 4695467 InventorsAssigneeApplicationNo. 06/884071 filed on 07/10/1986US Classes:424/494, Cellulose derivatives424/466, Effervescent424/495, Ethyl cellulose424/497Containing solid synthetic polymersExaminersPrimary: Lusignan, Michael R.Attorney, Agent or FirmInternational ClassesA61K 9/20 (20060101)A61K 9/28 (20060101) A61K 9/50 (20060101) Foreign Application Priority Data1985-07-19 GBAbstractThe invention relates to a Time-Controlled Explosion System in which drug release is caused by explosion of a membrane after a definite time period, said System comprising a preparation in the form of a bead or granule, said preparation comprising a core, a drug, swelling agent and an outer membrane of water-insoluble coating material.Field of SearchLayered unitary dosage formsCellulose or derivative Particulate form (e.g., powders, granules, beads, microcapsules, and pellets) Coated (e.g., microcapsules) Cellulose derivatives Ethyl cellulose Contains proteins or derivative or polysaccharides or derivative Effervescent Containing solid synthetic polymers | |
