Appeal No. 1997-1556
Application 08/340,247
Conventional animal fats and vegetable oils provide a convenient source for the
natural triglyceride diluents useful in the invention. In a preferred embodiment, the
vegetable oil is canola oil. Other suitable vegetable oils include corn oil, cottonseed
oil, sunflower oil, peanut oil, soybean oil, coconut oil, Jojoba oil, castor oil, palm
oil, and palm kernel oil. These natural triglycerides are readily available from
commercial sources, including, for example, Calgene, Inc., Pfau, Inc., Acme
Hardestry, Inc., and Resource Material Corp.
Specification, p. 7, lines 8-17(14).
Kulazhanov relates to hydraulic brake fluid including tributylphosphate and castor oil. The hydraulic
fluid is described as containing 70-80% tributylphosphate and 20-30% castor oil. The reference also
teaches that tricresylphosphate may replace part of the tributylphosphate. Tributylphosphate and
tricresylphosphate are phosphoric acid esters which may be depicted by the following structural formulas:
O
O
CH O P O CH
O
CH3(CH2)3 O P O (CH2)3CH3
O
(CH2)3CH3
CH
Tributylphosphate Tricresylphosphate
Neither of these compounds is a trialkoxyalkylphosphate. As indicated by applicants’ specification castor
oil is a natural triglyceride.
Thornley describes a lubricant composition which includes a mixture of a relatively non-volatile
substantially neutral organic ester and castor oil. A variety of esters are specified for use in the
composition. The preferred esters are aliphatic or cyclo-aliphatic alcohol esters of organic dicarboxylic
acids rather than phosphoric acid esters. However, tricresyl phosphate is specifically described as a useful
ester in the lubricant. The lubricant includes 10-90% castor oil and 90-10% ester.
The Moreton patent relates to fire-resistant hydraulic fluids and lubricants which include at least
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