Appeal No. 1997-2087
Application No. 08/203,837
disinfecting contact lenses and in destroying residual hydrogen peroxide present in a liquid
aqueous medium containing a contact lens which has been disinfected by the action of
hydrogen peroxide" (Id.)
The composition comprises a cellulose decomposing enzyme component (CDEC)
and a hydrogen peroxide destroying component (HPDC) (specification, page 4)
separated by a delayed release component, which can be in the form of a coating
(specification, page 15). The function of the CDEC is to "enhance the killing action of
hydrogen peroxide against hydrogen peroxide-resistant microorganisms, preferably
acanthamoeba cysts" (specification, page 7).
In addition, the claimed composition comprises a cleaning enzyme component
useful to remove proteinaceous deposit material from the contact lens resulting from the
CDEC (specification, page 9). The claimed composition also requires the composition to
be "a solid and structured" in a way to allow for dissolution of each component in a
particular sequence (Appendix A, claim 25, line 10). This structure includes a core that
contains the HPDC and the cleaning enzyme component; a delayed release layer covering
the core and the CDEC formed over the delayed
release layer (specification, page 9). Note that, alternatively, the cleaning enzyme
component may be provided as a coating directly adjacent to the core (Id.).
The method of the present invention comprises contacting a contact lens with a
liquid medium initially containing an effective contact lens disinfecting amount of hydrogen
peroxide in the presence of the claimed structured composition (specification, page 17).
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