Process for manufacturing device with dispersion zone
Patent 4285987 Issued on August 25, 1981. Estimated Expiration Date: 
November 1, 1999. 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.
November 1, 1999. 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 ReferencesOcular drug dispensing system Osmotic system with distribution zone for dispensing beneficial agent Patent #: 4200098 InventorsApplicationNo. 06/090492 filed on 11/01/1979US Classes:427/2.16, Retarded or controlled-release layer produced (e.g., enteric)427/2.21Retarded or controlled-release layer produced (e.g., enteric)ExaminersPrimary: Silverberg, SamAttorney, Agent or FirmInternational ClassA61K 9/00 (20060101)AbstractAn osmotic system is disclosed for dispensing a beneficial agent. The system comprises (1) a first wall of a semipermeable material that surrounds a compartment containing a drug formulation, and has a passageway through the wall for releasing agent from the compartment, (2) a second wall positioned distant from the first wall, said second wall a microporous or hydrogel material that extends around the first wall, and (3) a distribution zone interposed between the first and second wall and initially housing a compound soluble in an external fluid that enters the system.In operation, agent is dispensed from the system by fluid passing through the second wall into the zone from which fluid is further being imbibed through the first wall into the compartment forming a solution that is released through the passageway into the zone, and then through the second wall to the exterior of the system. | |
