Koji Naito

Title: Koji Naito and His Air-Conditioning Invention

Introduction

Koji Naito is an inventor associated with Hitachi, Ltd. and based in Shimizu, Japan. His patent work includes an air-conditioning system designed to improve the reliability of switching between heating and defrosting operations.

Latest Patents

Naito is credited with 1 patent, titled “Air conditioner.” The invention describes a refrigerant circuit with two outdoor heat exchangers and corresponding four-way valves. During a transition from heating to defrosting, the system switches the second four-way valve when the compressor’s discharge-to-suction pressure difference reaches a specified threshold. It then switches the first valve after pressure in the second outdoor heat exchanger has risen. This sequence is intended to prevent the valves from becoming inoperative because of a short circuit between the high- and low-pressure sides.

Career Highlights

Naito’s documented patent contribution focuses on refrigerant-flow control and valve operation in air-conditioning equipment. The invention addresses a specific operational challenge that can arise when a system changes modes.

Collaborations

Naito is associated with Hitachi, Ltd. His listed coworkers include Yasutaka Yoshida and Susumu Nakayama.

Conclusion

Koji Naito’s patent describes a carefully sequenced valve-control approach intended to support reliable transitions between heating and defrosting in an air conditioner.