Appeal No. 2002-0895
Application No. 09/402,552
APPEALED SUBJECT MATTER
The subject matter on appeal is directed to a process for
producing a coating having a titanium diboride content of at
least 80% by weight. Details of the appealed subject matter are
defined by claims 20 and 21 which are reproduced below:
20. A process for producing a coating having a
titanium diboride content of at least 80% by weight, which
comprises applying a spray powder coating of titanium
diboride having a thickness of from 0.1 mm to 1 mm, a
porosity of not more than 10% by volume and an oxygen
content of less than 1% by weight to the surface of a
substrate by plasma spraying in an atmosphere which is
virtually or completely free of oxygen, with no metal powder
being added to the spray powder, and wherein a spray powder
having a mean powder particle size of from 10 to 55 :m is
substantially or completely melted in a plasma flame in
order to apply the coating, the spray powder having an
oxygen content in the absence of carbon in the powder of
less than or equal to 1% by weight.
21. The process as claimed in claim 20, wherein plasma
spraying is carried out in a virtually or completely oxygen-
free atmosphere at a pressure of at least 500 mbar.
THE EVIDENCE
The examiner relies on the following prior art references:
Boxall et al. (Boxall) 4,354,918 Oct. 19, 1982
Gruenr 4,808,487 Feb. 28, 1989
Mills, et al., “Surface Cleaning, Finishing, and Coating,” Metal
Handbook, pp. 363-366 and 368 (9th Ed., Vol. 5, Am. Society for
Metals 1982)(hereinafter referred to as “Mills”).
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