Coating processes – Particles – flakes – or granules coated or encapsulated – Solid encapsulation process utilizing an emulsion or...
Reexamination Certificate
2007-05-29
2007-05-29
Wax, Robert A. (Department: 1656)
Coating processes
Particles, flakes, or granules coated or encapsulated
Solid encapsulation process utilizing an emulsion or...
C264S004330, C514S012200, C530S350000
Reexamination Certificate
active
11312371
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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Kumar Rajesh
Ramstack J. Michael
Rickey Michael E.
Alkermes, Inc.
Covington & Burling LLP
Reister Andrea G.
Wax Robert A.
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