Appeal 2007-1483
Application 10/344,390
weight percent, but more preferably the lubricating compositions are
substantially free of phosphorus. Colclough 580 at 4:35-36.
Colclough 580 provides examples of the invention as well as
comparative examples. Colclough 580 at 6:57-7:23.
Colclough 580 explains that the results reported in these examples
show that the lubricants of the invention have excellent antioxidant, anti-
wear, and bearing corrosion inhibition with substantial absence of
phosphorus. Colclough 580 at 7:24-26.
3. Waddoups
The invention disclosed in Waddoups encompasses methods for
improving the fuel economy properties of an internal combustion engine, the
method comprising the steps of adding the disclosed lubricating oil
composition to an engine and operating the engine. Waddoups at 1:52-56.
The lubricating oil composition contains phosphorus from a zinc
dihydrocarbyldithiophosphate (ZDDP) compound. Waddoups at 1:31-49.
The ZDDP compound is said to provide antioxidant and anti-wear
properties to the lubricating oil composition. Waddoups at 8:51-54.
Waddoups discloses that the lubricating oil composition must have a
low phosphorus content, i.e., the phosphorus from the ZDDP compound
should be present in an amount up to about 0.1 weight percent. Waddoups
at 9:6-9.
Preferably, the phosphorus content should be from about 0.025 weight
percent to about 0.1 weight percent. Waddoups at 9:9-11.
The compositions can be used in the formulation of crankcase
lubricating oils, i.e., passenger car motor oils, heavy duty diesel motor oils,
4
Page: Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 Next
Last modified: September 9, 2013