Appeal No. 96-1787
Application No. 08/372,482
soluble or water-insoluble substance in a vesicle formed from
a particular surface active siloxane.
Appellants acknowledge on page 3 of their Brief that the
pending claims stand or fall together. Accordingly, we will
limit our consideration to illustrative claim 1 which reads as
follows:
1. A method of entrapping a water-soluble substance in a
vesicle formed from a surface active siloxane comprising
forming a mixture by dissolving the water-soluble substance to
be entrapped in water, adding a surface active siloxane, and
agitating the mixture, the surface active siloxane consisting
essentially of tetravalent SiO units and monovalent R SiO2 3 1/2
and R’R SiO units, the ratio of monovalent units to
2 1/2
tetravalent units being from 0.4/1 to 2/1, and from 40 to 90%
of all monovalent units being R’R SiO units, wherein R
2 1/2
denotes a monovalent hydrocarbon group having up to 8 carbon
atoms, and R’ denotes a polyoxyalkylene group terminated by a
hydroxyl group, an alkyl group, an aryl group, or an acyl
group.
The examiner relies upon the following prior art
references as evidence of obviousness:
Kanner et al. (Kanner) 3,887,601 Jun. 3, 1975
Hill et al. (Hill) 5,364,633 Nov. 15, 1994
Hill et al. (Hill) 5,411,744 May 2, 1995
All of the appealed claims stand rejected under 35 U.S.C.
2
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