Appeal No. 1998-1060
Application No. 08/433,664
The invention relates to a method of manufacturing a
filtering layer on the faceplate of a display device such as a
cathode ray tube. In particular, the filtering layer contains
silicon dioxide, a metal oxide, and a dye.
The sole independent claim 5 is reproduced as follows:
5. A method of manufacturing a filtering layer of
silicon on a display screen of a display device, characterized
in that the filtering layer is manufactured by providing, on
the display screen, a coating of a mixture of an alcoholic
solution of an alkoxysilane compound, an alkoxy compound of at
least one metal selected from the group consisting of Ge, Zr,
Al and Ti, acidified water and a black dye and then heating
said thus coated display screen to a temperature sufficient to
form silicon dioxide from the alkoxysilane compound and to
form an oxide of said metal from said alkoxy compound thereby
forming the filtering layer comprising silicon dioxide, an
oxide of the metal and the dye.
The Examiner relies on the following references:
Kato et al. (Kato) 4,787,716 Nov. 29, 1988
Kawamura et al. (Kawamura) 5,291,097 Mar. 1, 1994
(filed May 1, 1991)
Kojima et al. (Kojima) EP 517,611 Dec. 9, 1992
Appellants’ Admitted Prior Art(APA)(pg. 1, line 20-pg. 2, line
2)
2) Claims 5 through 8 and 10 stand rejected under 35 U.S.C.
§ 103 as being unpatentable over either APA or Kojima in view
of Kawamura and further in view of Kato.
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