Phoqus Pharmaceuticals Limited

Phoqus Limited

Douglas Howard Nelson

David Hoover Feather

Marshall Whiteman

Linda Ann Reeves

Jack Michael Gazza

Martin David Hallett

A method of electrostatically applying a powder material to a solid dosage form comprises the following steps: applying a bias voltage to generate an electric field between a source () of the powder material and the solid dosage form (); applying an electrostatically charged powder material to the solid dosage form (), the powder material being driven onto the solid dosage form () by the interaction of the electric field with the charged powder material, an the presence of the charged powder material on the solid dosage form serving to build up an electric charge on the solid dosage form () and thereby reduce the electric field generated by the bias voltage between the source () of powder material and the solid dosage form (), and continuing the application of the electrostatically charged powder material to the solid dosage form () until the electric field between the source () of powder material and the solid dosage form is so small that the driving of the powder material by the electric field onto the solid dosage form () is substantially terminated.

Electrostatic application of powder material to solid dosage forms in an electric field

An apparatus for electrostatically applying a powder material to a solid dosage from includes a source () of charged powder material, a support assembly () for supporting the solid dosage form () with a front face in the vicinity of the source of powder material and facing the source of powder material, the support assembly () including an electrically conducting member () in the vicinity of the rear face of the solid dosage form and an electrically conducting shield () disposed closely around the solid dosage from () between the front face and the rear face of the solid dosage form, and means () for creating a potential difference between the source of powder material and the electrically conducting member and for maintaining the electrically conducting shield at a potential more similar to that of the source of powder material than to that of the electrically conducting member.

Electrostatic application of powder material to solid dosage forms utilizing an electrically conductive shield

In a method of electrostatically applying a powder material to a solid dosage form, charged powder material is applied to a photoconductive drum ( ), is transferred to an intermediate belt ( ) and then to a solid dosage form ( ). The belt ( ) makes contact with the solid dosage form ( ).

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Carlsbad, CA, United States of America

Douglas Howard Nelson