Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
2000-07-07
2009-12-08
Richter, Johann R (Department: 1616)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S400000
Reexamination Certificate
active
07628997
ABSTRACT:
The method of preserving a perishable cosmetic and/or pharmaceutical preparation includes adding bioactive glass particles to the preparation, preferably in amounts up to 10 percent by weight. The bioactive glass particles preferably have particle sizes (d50) less than or equal to 10 μm and contain from 40 to 60 wt. % SiO2, 10 to 30 wt. % CaO, 10 to 35 wt. % Na2O, 2 to 8 wt. % P2O5, 0 to 25 wt. % CaF2, 0 to 10 wt. % B2O3, 0 to 8 wt. % K2O and/or 0 to 5 wt. % MgO. A liquid cosmetic preparation with alcohol content insufficient for preservation is preserved in an inconspicuous manner by adding bioactive glass particles with particle sizes less than or equal to 10 μm and with a refractive index close enough to that of the liquid cosmetic preparation so that bioactive glass particles are substantially invisible to an observer.
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Kessler Susanne
Lee Sean
Brown Courtney
Richter Johann R
Schott AG
Striker Michael J.
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