Oval Engineering Co.,Ltd.
20Patents
0Active
20Granted
31Portfolio score
Filing activity: Jan 6, 1978 → Mar 19, 1993
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4974780A | Ultrasonic fuel injection nozzle | Mechanical Engineering; Lighting; Heating | 53 | Expired |
| US4526040A | Oscillation compensating apparatus for vortex flow meter | Emerging Cross-Sectional Technologies | 23 | Expired |
| US5392632A | Small volume prover | Physics | 21 | Expired |
| US4329130A | Flow meter with helical toothed rotors having no pulsation and zero contact pressure | Physics | 21 | Expired |
| US4627295A | Vortex flow meter | Emerging Cross-Sectional Technologies | 16 | Expired |
| US4224015A | Positive displacement flow meter with helical-toothed rotors | Physics | 16 | Expired |
| US4625564A | Vortex flow meter | Emerging Cross-Sectional Technologies | 15 | Expired |
| US4970902A | Karman's vortex flow meter | Physics | 13 | Expired |
| US4683760A | Vortex flow meter | Physics | 13 | Expired |
| US4969808A | Elastic tubing pump | Mechanical Engineering; Lighting; Heating | 13 | Expired |
| US5317895A | Flowmeter proving apparatus | Physics | 12 | Expired |
| US4977781A | Vortex flow meter | Physics | 12 | Expired |
| US5222395A | Thermal type flowmeter | Physics | 11 | Expired |
| US4392385A | Flow meter utilizing Karman vortex street | Physics | 6 | Expired |
| US4380934A | Gaseous fluid flow meter utilizing karman vortex street | Physics | 5 | Expired |
| US5167450A | Calorimeter | Physics | 5 | Expired |
| US5193399A | Vortex flowmeter | Physics | 2 | Expired |
| US4891989A | Vortex flow meter | Physics | 1 | Expired |
| US4511819A | Electrode connections for a piezoelectric sensor | Physics | 0 | Expired |
| US4838092A | Vortex flow meter | Physics | 0 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.