Spark-ignition internal combustion engine
Patent 4421081 Issued on December 20, 1983. Estimated Expiration Date: 
February 9, 2001. 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 9, 2001. 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 2718221 Dual spark plug ignition engine Multi-point spark ignition engine provided with exhaust recirculation circuit Combustion chamber of an internal combustion engine Patent #: 4296720 InventorsAssigneeApplicationNo. 06/232858 filed on 02/09/1981US Classes:123/310, COMBUSTION CHAMBER HAVING MULTIPLE SPARK GAPS123/661Having squish areaExaminersPrimary: Feinberg, Craig R.Attorney, Agent or FirmInternational ClassesF02F 1/24 (20060101)F02B 23/08 (20060101) F02P 15/00 (20060101) F02P 15/02 (20060101) F02B 1/00 (20060101) F02B 1/04 (20060101) Foreign Application Priority Data1980-02-12 JPAbstractA spark-ignition internal combustion engine having a combustion chamber, comprises intake and exhaust valves disposed on a cylinder head wall surface and positioned generally symmetrical with each other with respect to the center axis of the bore of an engine cylinder, at least first and second squish areas which are located respectively in first and second sections of the combustion chamber which sections are defined by dividing the combustion chamber into two by a first vertical plane containing the centers of the intake and exhaust valves, and a spark plug whose tip section is disposed on the cylinder head wall surface and positioned in said first section of the combustion chamber thereby enabling use of high compression ratio without causing engine knock.Other References
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