Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – Having -c- – wherein x is chalcogen – bonded directly to...
Reexamination Certificate
2011-04-26
2011-04-26
Eyler, Yvonne L (Department: 1619)
Drug, bio-affecting and body treating compositions
Designated organic active ingredient containing
Having -c-, wherein x is chalcogen, bonded directly to...
C424S487000, C424S130100, C424S484000, C424S498000, C424S490000, C424S472000
Reexamination Certificate
active
07932258
ABSTRACT:
The invention relates to the use of a partially neutralized, anionic (meth)acrylate copolymer comprising radically polymerized units of 25 to 95 percent by weight of C1to C4alkyl esters of acrylic or methacrylic acid and 5 to 75 percent by weight of (meth)acrylate monomers with an anionic group, at least 4 percent of which are neutralized by means of a base, for producing a medicament that is provided with an active substance-containing core and is coated with the partially neutralized, anionic (meth)acrylate copolymer. The medicament releases at least 30 percent of the active substance contained therein in 30 minutes at a pH at which the active substance is sufficiently soluble and stable and at which the corresponding medicament that is coated with the non-neutralized anionic (meth)acrylate polymer releases less than 10 percent of the active substance contained therein.
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Assmus Manfred
Petereit Hans-Ulrich
Evonik Roehm GmbH
Eyler Yvonne L
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Ziska Suzanne
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