Polyalkylene block copolymers as surface modifiers for nanoparticles
Patent 5565188 Issued on October 15, 1996. Estimated Expiration Date: 
February 24, 2015. 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.
February 24, 2015. 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 ReferencesPreparing capped polyoxyalkylene polyols Ion conductors Surface modified drug nanoparticles Formulations for nanoparticulate x-ray blood pool contrast agents using high molecular weight nonionic surfactants Patent #: 5326552 InventorsApplicationNo. 393972 filed on 02/24/1995US Classes:424/9.411, Polymer containing (e.g., polypeptide, synthetic resin, etc.)424/9.4, X-ray contrast imaging agent (e.g., computed tomography, angiography, etc.)424/9.45, Halogenated benzene ring containing424/489, Particulate form (e.g., powders, granules, beads, microcapsules, and pellets)424/495, Ethyl cellulose424/499, Contains proteins or derivative or polysaccharides or derivative514/718, Plural oxygens514/975CHARACTERIZED BY THE DESIGNATED SURFACTANT USEDExaminersPrimary: Krass, FrederickAttorney, Agent or FirmInternational ClassA61K 009/14AbstractThere is disclosed a composition containing nanoparticles having a surface modifier wherein the surface modifier is a block copolymer containing one or more polyoxyethylene blocks and one or more polyoxy(higher alkylene) blocks wherein at least some of the blocks are linked together by a linking group characterized in that the linking group is an oxymethylene group.Other References
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