Liquid purification or separation – Flow – fluid pressure or material level – responsive – Fluid pressure responsive by-pass
Reexamination Certificate
2007-01-23
2007-01-23
Savage, Matthew O. (Department: 1724)
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Fluid pressure responsive by-pass
C210S497010
Reexamination Certificate
active
10372602
ABSTRACT:
The present invention relates to small vehicles such as lawn and garden tractors and more specifically to an oil filter cartridge or assembly usable with the transmissions of such vehicles. The cartridge is comprised of a filtering element, a strainer element and a by-pass valve. The by-pass valve is housed within the strainer element and is adapted to direct oil flow through the strainer element, but not the filter element when the oil viscosity is high and only through the filter element when the oil viscosity is low. In this way, the parasitic horsepower loss caused by routing oil through the strainer element at all times is eliminated. The cartridge is also housed within the transmission case to reduce mounting bracketry outside the transmission case and minimize the likelihood of insufficient oil supply available for the filter, pump and hydraulic system functions.
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Deere & Company, Parts Catalog for 4310 Compact Utility Tractor, one page, date of publication— Jan. 2002, published in U.S.A.
Deere & Company
Savage Matthew O.
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