Location History:
- Hyogo, JP (1984)
- Osaka, JP (1985)
- Itami, JP (1979 - 1993)
- Kariya, JP (2004)
Company Filing History:
12 out of 10,240 
2 out of 3 
1 out of 3 Years Active: 1979-2004
Title: **The Innovative Contributions of Yoshihiko Doi: A Patent Portfolio Overview**
Introduction
Yoshihiko Doi, an accomplished inventor based in Itami, Japan, has made significant contributions to the field of engineering and materials science through his inventive spirit and technical prowess. With a portfolio of 14 patents, Doi's work exemplifies innovation that meets practical needs in various industries.
Latest Patents
Among his most recent innovations is the patent for an **oil pump for an internal combustion engine and method of operating the same**. This design integrates a power pump and an electric pump within a single housing, optimally addressing the challenges of oil discharging pressure. The dual functionality of the pumps allows for efficient performance, particularly when the power pump's capacity becomes inadequate, ensuring that the engine receives the required oil quantity even after shut-off.
Another remarkable patent involves the **formation of a ceramic composite by centrifugal casting**. This invention features a ceramic compact that boasts high-temperature strength and durability, created from a silicon nitride matrix reinforced with ceramic fibers. This process, utilizing centrifugal casting, showcases Doi's commitment to advancing material science by enhancing the reliability and performance of ceramic materials.
Career Highlights
Throughout his career, Doi has been associated with prominent companies, including **Sumitomo Electric Industries**, where he applied his skills in innovative engineering. His work has made considerable impacts, particularly in the development of efficient components for engines and advanced materials.
Collaborations
Yoshihiko Doi has had the privilege of collaborating with notable coworkers, including **Mitsunori Kobayashi** and **Nobuhito Kuroishi**. Together, they have contributed to cutting-edge projects, significantly enriching the technological landscape in their respective fields.
Conclusion
Yoshihiko Doi's contributions to innovation through his patents illustrate his dedication to solving complex engineering challenges. His latest advancements in oil pump design and ceramic materials not only highlight his engineering acumen but also set the stage for future developments in the industry. As he continues to innovate, the implications of his work may spur further advancements in automotive and materials technology.
Inventor’s Patent Attorneys refers to legal professionals with specialized expertise in representing inventors throughout the patent process. These attorneys assist inventors in navigating the complexities of patent law, including filing patent applications, conducting patent searches, and protecting intellectual property rights. They play a crucial role in helping inventors secure patents for their innovative creations.