This inventor holds 6 USPTO granted patents. Top assignees: Kubota Iron Works Co., Ltd., Mazda Motor Corporation, Nippon Kokan Kabushiki Kaisha. Active years: 1992-2008.
Company Filing History:
4 out of 13 
2 out of 4,746 
1 out of 487 
Years Active: 1992-2008
Title: Masahiro Dohi: Innovator in Hollow Stepped Shaft Technology
Introduction
Masahiro Dohi is a notable inventor based in Hiroshima, Japan. He has made significant contributions to the field of engineering, particularly in the development of hollow stepped shafts. With a total of six patents to his name, Dohi's work has been instrumental in advancing manufacturing techniques.
Latest Patents
One of Dohi's latest patents is for a hollow stepped shaft and the method of forming the same. This innovation involves creating a hollow stepped article from a solid blank, which reduces material costs and prevents cracking in the stepped portion of large diameter during radial expansion. The process includes holding a solid rod-like blank with upper and lower dies that have a stepped recess. By compressing the blank from both ends with punches smaller in diameter, an axial hollow is formed. This method allows for the formation of a stepped portion of large diameter while maintaining a continuous axial hollow.
Career Highlights
Throughout his career, Masahiro Dohi has worked with prominent companies such as Kubota Iron Works Co., Ltd. and Mazda Motor Corporation. His experience in these organizations has contributed to his expertise in engineering and innovation.
Collaborations
Dohi has collaborated with notable coworkers, including Shigeaki Yamanaka and Takeshi Kazama. Their combined efforts have furthered advancements in their respective fields.
Conclusion
Masahiro Dohi's contributions to the engineering sector, particularly through his innovative patents, have made a lasting impact. His work continues to influence manufacturing processes and techniques in the industry.