Oval Engineering Co., Ltd.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4974780 Ultrasonic fuel injection nozzleExpiredJun 19, 89Dec 04, 90[B05B]
4970902 Karman's vortex flow meterExpiredDec 04, 89Nov 20, 90[G01F]
4969808 Elastic tubing pumpExpiredNov 16, 89Nov 13, 90[F04B]
4627295 Vortex flow meterExpiredJan 21, 86Dec 09, 86[G01F]
4526040 Oscillation compensating apparatus for vortex flow meterExpiredJul 18, 83Jul 02, 85[G01F]
4511819 Electrode connections for a piezoelectric sensorExpiredSep 22, 83Apr 16, 85[H01L]
4392385 Flow meter utilizing Karman vortex streetExpiredSep 08, 80Jul 12, 83[G01F]
4380934 Gaseous fluid flow meter utilizing karman vortex streetExpiredDec 22, 80Apr 26, 83[G01F]
4329130 Flow meter with helical toothed rotors having no pulsation and zero contact pressureExpiredJul 02, 79May 11, 82[F01C, G01F]
4224015 Positive displacement flow meter with helical-toothed rotorsExpiredJan 06, 78Sep 23, 80[F01C, G01F]

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