Yoshishige Oyama

This inventor holds 58 USPTO granted patents, primarily in Internal Combustion Engines (CPC class 1234). Top assignees: Hitachi, Ltd., Nissan Motor Company Limited. Active years: 1978-2003.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Yoshishige Oyama. Retrieved from https://idiyas.com/inventor/yoshishige-oyama

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

USPTO Granted Patents = 58

% Patents Active = 96.6

Average Co-Inventor Count = 2.9

ph-index = 20

Forward Citations = 995(Granted Patents)

Forward Citations (Not Self Cited) = 969(Dec 10, 2025)

Inventors with similar research interests:

Location History:

Katsuta, JA (1978)
Ibaraki, JP (1983)
Hitachi, JP (1986)
Katsuta, JP (1978 - 1989)
Hitachinaka, JP (1997 - 2003)

Company Filing History:

Nissan Motor Company Limited

patents

where one patent can have more than one assignee

Years Active: 1978-2003

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Areas of Expertise:

Air-Fuel Ratio Control

Fuel Supply Systems

Detection Methods

Engine Control Apparatus

Air Flow Meter

Fuel Injection Apparatus

Liquid Atomizer

Oxygen Concentration Control

Automatic Transmission

Multi-Cylinder Fuel Atomizer

Fuel Feeding Apparatus

Control System

58 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 6644270 - Apparatus for and method of controlling internal combustion engine (2003-11-11),

2. 6453871 - Apparatus for and method of controlling internal combustion engine (2002-09-24),

3. 6343585 - Apparatus for and method of controlling internal combustion engine (2002-02-05),

4. 6148791 - Apparatus for and method of controlling internal combustion engine (2000-11-21),

5. 5875761 - Apparatus for and method of controlling internal combustion engine (1999-03-02),

6. 5666916 - Apparatus for and method of controlling internal combustion engine (1997-09-16),

7. 4887574 - Control apparatus for internal combustion engines (1989-12-19),

8. 4882030 - Air-fuel ratio detection system for engine exhaust gas (1989-11-21),

9. 4865006 - Liquid atomizer (1989-09-12),

10. 4825838 - Air/fuel ratio control apparatus for an internal combustion engine (1989-05-02),

11. 4814045 - Method for detecting air-fuel ratio (1989-03-21),

12. 4791903 - Fuel supply system for internal-combustion engine (1988-12-20),

13. 4779455 - Air-fuel ratio detecting sensor (1988-10-25),

14. 4771752 - Control system for internal combustion engines (1988-09-20),

15. 4751907 - Air/fuel ratio detecting apparatus for internal combustion engines (1988-06-21),

Title: Innovations by Yoshishige Oyama: Pioneering Internal Combustion Engine Control

Introduction: Yoshishige Oyama, a prolific inventor based in Katsuta, Japan, has made significant contributions to the field of internal combustion engines, holding an impressive portfolio of 58 patents. His work is characterized by innovative solutions aimed at enhancing fuel efficiency and drivability.

Latest Patents: One of Oyama's latest patents introduces an apparatus and method for controlling internal combustion engines. The invention focuses on reducing pumping losses under partial load through stratified combustion, thereby improving fuel consumption. During maximum output operations, the output of the engine is enhanced using premixture combustion techniques. Under partial load conditions, an ignition source is strategically placed near the fuel injection valve to ignite the fuel mixture effectively. When the load increases, multiple injections of fuel in a divided manner allow for the production of a premixture within the cylinder, which is then ignited to ensure efficient combustion.

Career Highlights: Oyama's career includes working for notable companies such as Hitachi, Ltd. and Nissan Motor Company Limited. His extensive experience in these organizations has provided him with a solid foundation in engineering and innovation in automotive technologies.

Collaborations: Throughout his career, Oyama has collaborated with notable professionals in the industry, including Hiroshi Kuroiwa and Yutaka Nishimura. These collaborations have fostered a creative environment that has led to groundbreaking advancements in engine technology.

Conclusion: Yoshishige Oyama's contributions to internal combustion engine technology through his numerous patents exemplify his commitment to innovation and efficiency in automotive engineering. With a focus on enhancing drivability and fuel efficiency, his work continues to impact the automotive industry positively.

Profile summary based on public USPTO records.

Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]