Osmotic bursting drug delivery device
Patent 4177256 Issued on December 4, 1979. Estimated Expiration Date: 
November 29, 1997. 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 29, 1997. 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 ReferencesInventorsAssigneeApplicationNo. 05/855605 filed on 11/29/1977US Classes:424/427, Ocular424/432, IUD or ring424/473, With porous, perforated, apertured, or sieved layer (e.g., dialyzing layer, microporous layer, etc.)604/892.1Osmotic or diffusion pumped device or systemExaminersPrimary: Rose, Shep K.Attorney, Agent or FirmInternational ClassesA61K 9/00 (20060101)A61F 6/00 (20060101) A61F 9/00 (20060101) A61F 6/14 (20060101) AbstractA drug delivery for administering drug to an aqueous body environment at a substantially constant rate. The devices consist essentially of a mixture of drug of specific average particle size dispersed in a polymer of specific water permeability, tensile strength, and Young's modulus in specific volume proportions such that the particles are surrounded substantially individually by the polymer. The constancy of the release rate of drug from the devices is governed by the drug particle size and volume proportion of drug in the mixture.Other References
| |
