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Oval Corporation

USPTO Granted Patents = 49

% Expired Patents = 30.6

CIPO Patents = 2

EPO Patents = 24

Trademarks = 4

Forward Citations = 247

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44 inventors (with patents filed for the assignee):

Hirokazu Kitami (14 out of 14 patents)

Yuichi Nakao (12 out of 12 patents)

Hideki Shimada (8 out of 11 patents)

4. Seiji Kobayashi (6 out of 230 patents)

5. Norio Sukemura (6 out of 6 patents)

6. Naoki Matsubara (5 out of 25 patents)

7. Shingo Gomi (5 out of 6 patents)

8. Katsuichi Uchida (3 out of 3 patents)

9. Kenichi Matsuoka (3 out of 6 patents)

10. Kimihiro Ichinose (3 out of 4 patents)

11. Hiroyuki Kabaya (3 out of 3 patents)

12. Takashi Endo (2 out of 60 patents)

13. Yasushi Ito (2 out of 58 patents)

14. Noriaki Nakayama (2 out of 2 patents)

15. Kenji Washio (2 out of 2 patents)

Core Competencies:

Coriolis Flowmeter

Signal Processing

Temperature Measurement

Vortex Flow Meter

Positive Displacement Flowmeter

Multi-Vortex Flowmeter

Mass Flowmeter

Flow Rate Converter

Fluid Measurement

Pressure Loss Reduction

Piston Prover

Photoelectric Sensing

49 patents: Sort by Forward Citations

1. 10320377 - Instrumentation device having pulse output function (2019-06-11),

2. 9506801 - Piston prover (2016-11-29),

3. 9506793 - Coriolis flowmeter having a cross-sectional area of channels of the manifolds enabling a reduction in pressure loss (2016-11-29),

4. 8970124 - Field equipment photoelectric sensing sensitivity adjustment (2015-03-03),

5. 8915115 - Piston prover (2014-12-23),

6. 8862434 - Maintenance expert system for measuring instrument (2014-10-14),

7. 8725433 - Signal processing method, signal processing apparatus, and Coriolis flowmeter (2014-05-13),

8. 8725432 - Signal processing method, signal processing apparatus, and Coriolis flowmeter (2014-05-13),

9. 8700343 - Signal processing method, signal processing apparatus, and Coriolis flowmeter (2014-04-15),

10. 8676518 - Signal processing method, signal processing apparatus, and Coriolis flowmeter (2014-03-18),

11. 8676517 - Signal processing method, signal processing apparatus, and coriolis flowmeter (2014-03-18),

12. 8442781 - Coriolis flowmeter (2013-05-14),

13. 8425212 - Positive displacement flowmeter and helical gear (2013-04-23),

14. 8212769 - Hierarchical structure display (2012-07-03),

15. 8184017 - Processing method in operation system, flow rate converter, and coriolis flow meter (2012-05-22),

Oval Corporation, headquartered in Tokyo, specializes in advanced flow measurement technologies. The company focuses on the development and manufacturing of various flowmeters, including Coriolis, positive displacement, and multi-vortex types, alongside innovative signal processing apparatus and temperature measuring circuits. Oval's expertise extends to mass flowmeter converters and servo type volumetric flowmeters, positioning it as a key player in precision measurement solutions across diverse industrial applications.

Profile summary based on public USPTO records.

Company Badge

USPTO Data Jan 1 1976 - Sep 29 2026

Oval Corporation

49 Patents

#809 in Tokyo

#1,735 in Japan

#14,256 in the World

Oval Corporation

Forward Citations = 247

44 inventors:

Hirokazu Kitami (14 out of 14 patents)

Yuichi Nakao (12 out of 12 patents)

Hideki Shimada (8 out of 11 patents)

4. Seiji Kobayashi (6 out of 230 patents)

5. Norio Sukemura (6 out of 6 patents)

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