Interference No. 103,995 Paper 29
Morel v. Sekhar Page 37
furnace atmosphere, and (b) a refractory filler, which further enhances the impermeability of
the coating (MDEx c. 2, ll. 40-51).
75. A 65-85 % matrix / 35-15% filler ratio is used for a service temperature of 700o
o
C; while a 25-50 % matrix / 75-50% filler ratio is used for a service temperature of 1600 C
(MDEx 2, c. 2, l. 66 - c. 3, l. 3).
76. Suitable matrices may be (a) graphite wetting materials, e.g. boron containing
compounds, e.g., boric oxide and boric acid, (b) combinations of glaze-forming materials,
e.g., phosphates (such as alkali metal phosphates), fluorides (such as calcium fluoride,
sodium aluminum fluoride and sodium borofluoride) and silicates (such as alkali metal
silicates), or (c) combinations of (a) and (b) (MDEx 2, c. 3, ll. 24-38).
77 . Suitable fillers may be refractory oxides, carbides, nitrides or borides, e.g.,
“chromic oxide, zirconium oxide, titanium oxide, silicon carbide, zirconium carbide,
wolfram carbide, boron nitride, titanium boride, zirconcium boride, silicon nitride” (MDEx 2,
c. 3, ll. 39-43).
78. Protecting coating compositions comprising boron compounds with refractory
carbide fillers are preferred (MDEx 2, c. 3, ll. 48-50). A dry powder coating composition of
50% B O (boron oxide) and 50% silicon carbide is exemplified (MDEx 2, c. 3, ll. 64-65).
2 3
Morel’s statement of obviousness
Morel acknowledges that Weir differs from Sekhar claims 77-82 in not disclosing
the presence of zirconium diboride in the coating composition (Paper 14, p. 6, ¶ 14).
Morel maintains that it would have been obvious to one of ordinary skill in the art “to
replace all or part of the titanium diboride of ... with zirconium diboride” in view of Lorkin’s
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