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US Patent 7524530 Residual solvent extraction method and microparticles produced thereby

Patent 7524530 was granted and assigned to Alkermes on April, 2009 by the United States Patent and Trademark Office.

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Patent Inventor Names

J. Michael Ramstack1

Michael E. Rickey1

Rajesh Kumar1

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Patent abstract

Methods for preparing microparticles having reduced residual solvent levels. Microparticles are contacted with a non-aqueous washing system to reduce the level of residual solvent in the microparticles. Preferred non-aqueous washing systems include 100% ethanol and a blend of ethanol and heptane. A solvent blend of a hardening solvent and a washing solvent can be used to harden and wash microparticles in a single step, thereby eliminating the need for a post-hardening wash step.

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Official Website

https://pdfpiw.uspto.gov/.piw?Docid=075245301

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