Fuel filter apparatus with anti-electrostatic function
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United States of America Patent
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-
Jun 12, 2001
Grant Date -
N/A
app pub date -
Jul 14, 1999
filing date -
Aug 19, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The filter apparatus is composed of a filter housing made of non-conductive material, a filter element made of conductive material contained in the filter housing, and a conductive plug with a sealing element. The filter housing has a bore and the conductive plug is inserted into the bore of the filter housing so that the clearance between the conductive plug and the filter housing is hermetically sealed by the sealing element. The conductive plug is connected in circuit to the filter element in a manner that a part of the plug is exposed out of the filter housing and an earth wire attached to the exposed portion of the plug. The static electricity generated in the filter apparatus is released via a conductive path extending from the filter element through the plug to the earth wire so that the electrostatic discharge may be prevented. The conductive plug is made of material having 10.sup.7 to 10.sup.11 .OMEGA..multidot.cm resistivity. Such a value of resistivity serves to assure not only an adequate conductivity for releasing the static electricity but also an adequate resistance for preventing the electrostatic discharge from the conductive plug, if the earth wire becomes off or its connection is forgotten.
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