Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Particulate form
Reexamination Certificate
2005-05-24
2005-05-24
Page, Thurman K. (Department: 1615)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Particulate form
Reexamination Certificate
active
06896905
ABSTRACT:
A method of forming, by polymerization in an aqueous dispersion at pressures in excess of one atmosphere, a plurality of porous particles having at least one polymeric phase and at least one pore filling phase, wherein the pore filling phase includes a pore filler and a fugitive substance, is disclosed. Replacement of the fugitive substance with a replacement gas is further disclosed. Porous particles having a polymeric phase and pores containing a pore filler, and, optionally, a gaseous phase are also disclosed, as are their aqueous dispersions.
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Blankenship Robert Mitchell
Clikeman Richard Roy
Hemenway Carl P.
Joynes Robert M.
Rohm and Haas Company
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