Seal with self-lubricating contact surface
Patent 5409240 Issued on April 25, 1995. Estimated Expiration Date: 
November 12, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 12, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2367403 2420040 2888281 3515393 3636824 2-Thiouracil in heat-developable light-sensitive materials Mechanical seal assembly with integral pumping device Ring seal with overlapping flanges for contaminant trapping Ring seal with overlapping flanges for contaminant trapping Canted coiled spring and seal InventorAssigneeApplicationNo. 975624 filed on 11/12/1992US Classes:277/366, Shaft mounted sealing face members biased axially away from each other277/374, Retains opposed sealing face members277/380, Made of elastomeric material277/397, Frictionally engaged or interfitting projection and recess277/407, Elastomeric or plastic277/937Glass particles or filamentExaminersPrimary: DePumpo, Daniel G.Attorney, Agent or FirmForeign Patent References
International ClassF16J 015/40AbstractA seal between a housing and a rotatable shaft is provided, comprising a first ring member generally concentric with a rotatable shaft, the first ring member being attachable to the shaft in a non-rotatable position relative to the shaft, the first ring member further having an annular self-lubricating sealing surface facing away from the first ring member; and wherein the sealing surface is adapted to face a fixed annular surface and to slidably and sealingly engage the fixed annular surface when the first ring member is biased toward the fixed surface. The self-lubricating surface may be provided on a sealing ring which is biased against the fixed surface. The self-lubricating surface, sealing ring and/or first ring member may be constructed of a fluoroplastic material such as glass filled polytetrafluoroethylene. The fixed surface may be provided on a second ring member, enabling the seal to function as a cartridge unit.Other References
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