Free piston internal combustion engine with piston head functioning as a bearing
Patent 6205961 Issued on March 27, 2001. Estimated Expiration Date: 
February 22, 2019. 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.
February 22, 2019. 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 ReferencesDiesel pile hammer with vent for starting Cyclic dwell engine Ringless piston engine Polymetallic piston-cylinder configuration for internal combustion engines Heat-insulating engine structure Process for making carbon-carbon composites by using acetylene terminated conjugated Schiff's base monomers Reciprocating system Patent #: 5540194 InventorsAssigneeApplicationNo. 09/252831 filed on 02/22/1999US Classes:123/46RFREE PISTONExaminersPrimary: McMahon, MargueriteAssistant: Benton, Jason Attorney, Agent or FirmInternational ClassesF02B 71/04 (20060101)F02B 71/00 (20060101) AbstractA free piston internal combustion engine includes a housing with a combustion cylinder and a second cylinder. A piston includes a piston head reciprocally disposed within the combustion cylinder, a second head reciprocally disposed within the second cylinder, and a plunger rod rigidly attached to each of and interconnecting the piston head and the second head. The piston head defines a bearing with the inside surface of the combustion cylinder. A single bearing is carried by the housing within the second cylinder and reciprocally carries the plunger rod. The single bearing is the only bearing which directly carries the plunger rod.Other References
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