Hiroyuki Kiyota

Title: Hiroyuki Kiyota: Cryogenic Refrigerator Inventor

Introduction

Hiroyuki Kiyota is an inventor associated with Kamakura, Japan, and Mitsubishi Denki Kabushiki Kaisha, commonly known as Mitsubishi Electric. His patent work includes technologies for cryogenic refrigerators, focusing on piston and displacer support and refrigerator operation. Kiyota is credited with 4 patents.

Latest Patents

One of Kiyota’s latest patents, “Piston/displacer support means for a cryogenic refrigerator,” describes a support system for the reciprocating piston and displacer in a cryogenic refrigerator. It uses flat suspension springs with spiral slits and spiral arms, held in place by inner and outer retainers. The arrangement supports piston movement while securing the springs at their inner and outer edges.

Another patent, “Refrigerator,” concerns a refrigerator with a movable coil that drives a piston through a magnetic field. The piston changes the volume of a compression space, while a reciprocating displacer divides the cold cylinder into cold and hot spaces. A regenerator is positioned within the displacer, and a changeover mechanism short-circuits the movable-coil conductor when the refrigerator is not in use.

Career Highlights

Kiyota’s listed inventions address components and operating mechanisms used in cryogenic refrigeration. His work at Mitsubishi Electric connects his patent activity with the company’s engineering efforts in refrigerator technology.

Collaborations

Nobuo Fujii and Takeshi Miyazawa are identified as Kiyota’s coworkers. The available information does not specify their roles in the patents described here.

Conclusion

Hiroyuki Kiyota’s patent portfolio reflects contributions to cryogenic refrigerator design, including suspension systems for reciprocating components and mechanisms for controlling refrigerator operation.