Oval Engineering Co.,Ltd.
Records under this name other than patents Oval Engineering Co.,Ltd. holds now: patents now held by others, patents whose terms have ended, and its applications, pending or abandoned.
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| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US 4,224,015 | Positive displacement flow meter with helical-toothed rotors Term ended Term ended no later than Sep 23, 2000 · Low confidence | Term ended | Term ended no later than Sep 23, 2000 | Low confidence |
| US 4,329,130 | Flow meter with helical toothed rotors having no pulsation and zero contact pressure Term ended Term ended no later than May 11, 2002 · Low confidence | Term ended | Term ended no later than May 11, 2002 | Low confidence |
| US 4,380,934 | Gaseous fluid flow meter utilizing karman vortex street Term ended Term ended no later than Apr 26, 2003 · Low confidence | Term ended | Term ended no later than Apr 26, 2003 | Low confidence |
| US 4,392,385 | Flow meter utilizing Karman vortex street Term ended Term ended no later than Jul 12, 2003 · Low confidence | Term ended | Term ended no later than Jul 12, 2003 | Low confidence |
| US 4,511,819 | Electrode connections for a piezoelectric sensor Term ended Term ended no later than Apr 16, 2005 · Low confidence | Term ended | Term ended no later than Apr 16, 2005 | Low confidence |
| US 4,526,040 | Oscillation compensating apparatus for vortex flow meter Term ended Term ended no later than Jul 2, 2005 · Low confidence | Term ended | Term ended no later than Jul 2, 2005 | Low confidence |
| US 4,625,564 | Vortex flow meter Formerly held Term ended Term ended no later than Dec 2, 2006 · Low confidence | Term ended | Term ended no later than Dec 2, 2006 | Low confidence |
| US 4,627,295 | Vortex flow meter Term ended Term ended no later than Dec 9, 2006 · Low confidence | Term ended | Term ended no later than Dec 9, 2006 | Low confidence |
| US 4,683,760 | Vortex flow meter Formerly held Term ended Term ended no later than Aug 4, 2007 · Low confidence | Term ended | Term ended no later than Aug 4, 2007 | Low confidence |
| US 4,838,092 | Vortex flow meter Formerly held Term ended Term ended no later than Jun 13, 2009 · Low confidence | Term ended | Term ended no later than Jun 13, 2009 | Low confidence |