Temperature-controlled active agent dispenser
Patent 4830855 Issued on May 16, 1989. Estimated Expiration Date: 
November 13, 2007. 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 13, 2007. 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 2671451 3093831 3118439 3242051 3428729 3485235 3608549 3737521 3880991 Polymeric article for dispensing drugs InventorAssigneeApplicationNo. 07/120399 filed on 11/13/1987US Classes:424/448, Pressure sensitive adhesive means424/416, Insecticidal paper or foil424/449, Transdermal or percutaneous424/484, Matrices424/486, Synthetic polymer424/487Acrylic acid and derivativesExaminersPrimary: Page, Thurman K.Attorney, Agent or FirmInternational ClassesA61K 9/20 (20060101)A61K 47/32 (20060101) AbstractTemperature-controlled diffusional active agent dispensers that use a side-chain crystallizable polymer in a form that is not free to flow above its melt temperature as a rate-controlling matrix are disclosed. The polymer may be crosslinked to render it nonflowable, be supported, or grafted to a permeable support. Elements that facilitate or permit heating by radiation or electrical conductance/inductance may be included in the dispenser. At temperatures below the melt temperature of the polymer, the polymer is substantially impermeable to the agent. At tempertures at or above the melt temperature the polymer is substantially permeable to the agent.Other References
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