Appeal No. 2005-2510 Page 2
Application No. 10/122,049
based on the fluid base stock, wherein the fluid meets
Boeing test BMS 3-11L.
Claim 15 is reproduced below.
15. A method for enhancing the erosion resistance of a
hydraulic fluid to meet the Boeing test BMS 3-11L wherein
the fluid comprises:
a phosphate ester basestock wherein the basestock
comprises:
10 to 100 weight percent of trialkyl phosphates;
0 to 75 weight percent of dialkyl aryl phosphates;
0 to 30 weight percent of alkyl diaryl phosphates;
0 to 20 weight percent of alkylated triaryl phosphates;
wherein the alkyl groups have 4 to 5 carbon atoms;
a poly alkylacrylate or methacrylate viscosity index
improver where the repeating limits substantially comprise
n-hexyl and idodecyl acrylate or methacrylate and wherein at
least 95 wt% of viscosity index improver has a molecule
weight between about 50,000 and 900,000; and,
an acid scavenger represented by the formula
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