Location History:
- Yawata, JP (1997)
- Osaka, JP (2003 - 2009)
Company Filing History:
7 out of 906 
1 out of 21,862 
Years Active: 1997-2009
Title: The Innovative Contributions of Yoshio Kurokawa
Introduction
Yoshio Kurokawa is a notable inventor based in Osaka, Japan. He has made significant contributions to the field of engineering, particularly in the development of hydraulic tensioners. With a total of 7 patents to his name, Kurokawa's work has had a lasting impact on various industries.
Latest Patents
Kurokawa's latest patents include a hydraulic tensioner with an improved relief valve. This innovative design features a relief valve spring-receiving plug that is press-fit into the plunger. The plug is formed by forging a plurality of flat surfaces on its exterior, which, in cooperation with the cylindrical inner wall of the plunger, create multiple oil passages. These passages allow for the flow of oil past the plug to a discharge opening at the front end of the plunger, ensuring that the flow remains largely unaffected by any circumferential displacement.
Another significant patent is the ratchet type tensioner. This design incorporates a toothed rack on its plunger and a pawl that cooperates with the rack. A recess is strategically placed between the front end of the rack and the protruding end of the plunger. During the initial operation stages, the pawl can enter the recess, allowing the plunger to move freely within a limited range. As the chain controlled by the tensioner elongates, the pawl engages with the rack to limit the retraction of the plunger.
Career Highlights
Throughout his career, Kurokawa has worked with prominent companies such as Tsubakimoto Chain Company and Honda Motor Co., Ltd. His experience in these organizations has allowed him to refine his skills and contribute to various innovative projects.
Collaborations
Kurokawa has collaborated with several talented individuals in his field, including Tsutomu Namie and Nobuyuki Fujimoto. These collaborations have fostered an environment of creativity and innovation, leading to the development of groundbreaking technologies.
Conclusion
Yoshio Kurokawa's contributions to the field of engineering through his patents and collaborations highlight his innovative spirit. His work continues to influence the industry, showcasing the importance of creativity and technical expertise in driving advancements.
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.