Shock-absorbing piston made up of dissimilar joined parts, blank for the piston and method for manufacturing the piston
Patent 5259294 Issued on November 9, 1993. Estimated Expiration Date: 
March 27, 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.
March 27, 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 2859296 3093891 3338552 3827538 Oscillation damper Damping valve unit for a hydraulic oscillation damper Patent #: 4993524 InventorAssigneeApplicationNo. 859332 filed on 03/27/1992US Classes:92/181P, Passage thru piston to opposite chamber29/888.042, Multi-element piston making29/888.044, With assembly or composite article making91/228, Piston carries separate inlet and exhaust valves92/185, Passages communicate with common packing receiving recess92/249, Flexible92/256, Fastening means for parts include resilient element188/322.15, Piston valve detail (e.g., seat design, structural arrangement, metering element)188/322.22Thrust member or piston structureExaminersPrimary: Look, Edward K.Assistant: Nguyen, Hoang Attorney, Agent or FirmForeign Patent References
International ClassesF01B 031/00F01L 021/04 Foreign Application Priority Data1951-03-27 DEAbstractA shock-absorbing piston, a blank for the piston and a method for producing the piston include two parts being constructed radially symmetrically, but formed with outer and inner parts differing from each other. This offers great variability in the shaping of the functionally essential elements of the shock-absorbing piston.Field of SearchDistributor in piston (422)With condition responsive stop means Piston carries separate inlet and exhaust valves With fluid passage in piston face Passage thru piston to opposite chamber Passage in opposed piston faces Passages communicate with common packing receiving recess Fastening means for parts include resilient element Plural separable parts Flexible Piston making Multi-element piston making With assembly or composite article making Via fixed or variable orifice in piston Piston valve detail (e.g., seat design, structural arrangement, metering element) Thrust member or piston structure | |
