Mineral oils: processes and products – Products and compositions – Lubricating oils
Reexamination Certificate
2006-05-16
2006-05-16
McAvoy, Ellen M. (Department: 1764)
Mineral oils: processes and products
Products and compositions
Lubricating oils
C208S019000, C208S950000, C508S110000, C508S591000
Reexamination Certificate
active
07045055
ABSTRACT:
This invention is directed to a method of operating a wormgear drive at high energy efficiency comprising filling an oil reservoir with a wormgear lubricant comprising an isomerized Fischer-Tropsch derived distillate fraction having a low traction coefficient and operating the wormgear drive with the filled oil reservoir at an equilibrium temperature between 20 and 225 degrees C. This invention is also directed to a process for reducing the traction coefficient of a higher-traction coefficient lubricating base oil by blending it with an isomerized Fischer-Tropsch derived distillate fraction. This invention is also directed to a wormgear lubricant comprising an isomerized Fischer-Tropsch distillate fraction and between 2 and 50 weight percent thickener.
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Abernathy Susan M.
Miller Stephen J.
Okazaki Mark E.
Rosenbaum John M.
Ziemer James N.
Abernathy Susan M.
Ambrosius James W.
Chevron U.S.A. Inc.
Klaassen Alan W.
McAvoy Ellen M.
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