Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Biocides; animal or insect repellents or attractants
Reexamination Certificate
2001-08-17
2008-03-18
Hartley, Michael G. (Department: 1618)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Biocides; animal or insect repellents or attractants
C424S400000, C424S401000, C424S409000, C424S600000, C424S617000, C424S618000
Reexamination Certificate
active
07344726
ABSTRACT:
In a process for the preparation of an article having a contact biocidal property, there is provided a polymer solution which contains atomic/metallic silver in suspension or complexed with the polymer and/or which contains a silver compound in solution, in suspension or complexed with the polymer. This polymer solution is applied to a substrate by impregnation or surface deposition, thus coating the substrate. Alternatively, it is possible to convert the polymer solution to a fibre, film, powder or foam, effectively forming the article from the polymer solution instead of coating an existing article. In either case, any silver compound present is reduced to atomic/metallic silver, and the resultant article is dried.Chitosan is preferably used as the polymer, although poly(vinyl alcohol) and sodium alginate can also be used. The polymer may be cross-linked at a suitable point in the process to insolubilize it.
REFERENCES:
patent: 5322758 (1994-06-01), Texter et al.
patent: 6093422 (2000-07-01), Denkewicz et al.
patent: 2002/0081930 (2002-06-01), Jackson et al.
Roberts George Andrew Francis
Taylor Alan
Wood Frances Ann
Chitoproducts Limited
Gilster Peter S.
Greensfelder Hemker & Gale, P.C.
Hartley Michael G.
Oh Simon J.
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