Method of growing crystals

Details Method of growing crystals Method of growing crystals

2007-12-11

2007-12-11

Richter, Johann R. (Department: 1616)

Drug, bio-affecting and body treating compositions

Preparations characterized by special physical form

Particulate form

C424S682000, C424S686000, C424S715000

Reexamination Certificate

active

11124892

ABSTRACT:
A composition is provided comprising a substance of interest encapsulated by a continuous layer of a plurality of salt crystals which layer is impermeable to the substance of interest. Also provided is a method of producing a continuous layer of a plurality of salt crystals, the salt comprising a cation and an anion, which method comprises(i) providing a substrate which comprises a plurality of negatively charged binding sites for the cation and/or a plurality of positively charged binding sites for the anion, and(ii) contacting the substrate with a solution of the salt under conditions which cause nucleation of salt crystals comprising the cation and the anion at a plurality of said binding sites,the plurality of charged binding sites being present on the surface of the substrate at a sufficient density so that the resulting plurality of salt crystals form a continuous layer.

REFERENCES:
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patent: 6413749 (2002-07-01), Becker et al.
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patent: 55153709 (1980-11-01), None
patent: 03/064514 (2002-08-01), None
Lewis, Sr., J., Hawley's Condensed Chemical Dictionary, 1997, John Wiley & Sons, Inc., 3th Edition, pp. 1016-1017.
European Search Report No. EP 04 25 3647 dated Nov. 12, 2004—2 pp.
International Search Report No. PCT/EP2005/004732 dated Jul. 11, 2005.

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