Appeal No. 1997-3548
Application No. 08/457,200
weight coated composite particles dispersed in a polymeric
binder, said coated composite particles comprising
a) a magnetizable core; and
b) a continuous, amorphous, aluminum hydrous oxide
coating formed on the magnetizable core, wherein said coating
has an average thickness in the range from about 0.5 to about
5 nanometers.
The examiner relies upon the following references as
evidence of obviousness:
Homola et al. (Homola '918) 4,280,918 Jul. 28, 1981
Homola et al. (Homola '156) 4,438,156 Mar. 20, 1984
Fukke et al. (Fukke) 4,789,581 Dec. 06, 1988
Stanka Kratohvil and Egon Matijevic (Kratohvil), "Preparation
and Properties of Coated, Uniform, Inorganic Colloidal
Particles: 1, Aluminum (Hydrous) Oxide on Hematite, Chromia,
and Titania," 2 Advanced Ceramic Materials no. 4, 798-803
(1987)
Appellants' claimed invention is directed to a magnetic
recording medium comprising a magnetizable layer made up of
composite particles dispersed in a polymeric binder. The
composite particles comprise a magnetizable core and a
continuous, amorphous, aluminum hydrous oxide coating on the
core.
Appealed claims 33-44 stand rejected under 35 U.S.C.
§ 103 as being unpatentable over Fukke in view of Homola '918,
Homola '156 and Kratohvil.
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