Company Filing History:

11 out of 42,485

Hitachi, Ltd.

1 out of 832,680

Other

patents

where one patent can have more than one assignee

Years Active: 1977-2002

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12 patents (USPTO):Sort by Forward Citations

Abstract keywords

1. 6412549 - Heat transfer pipe for refrigerant mixture (2002-07-02),

2. 6050328 - Heat exchanger and air conditioner using same (2000-04-18),

3. 6018963 - Refrigeration cycle (2000-02-01),

4. 5803165 - Heat exchanger (1998-09-08),

5. 5542271 - Air-conditioner employing non-azeotrope refrigerant (1996-08-06),

6. 5360060 - Fin-tube type heat exchanger (1994-11-01),

7. 5181392 - Air conditioner and heat exchanger used therein (1993-01-26),

8. 4593756 - Fin-and-tube type heat exchanger (1986-06-10),

9. 4469168 - Fin assembly for heat exchangers (1984-09-04),

10. 4469167 - Heat exchanger fin (1984-09-04),

11. 4211276 - Method of making fin elements for heat exchangers (1980-07-08),

12. 4044797 - Heat transfer pipe (1977-08-30),

Title: Masaaki Itoh: Innovator in Heat Transfer Technology

Introduction

Masaaki Itoh is a prominent inventor based in Tsuchiura, Japan, known for his significant contributions to heat transfer technology. With a total of 12 patents to his name, Itoh has made remarkable advancements in the field of refrigeration and air conditioning systems.

Latest Patents

One of his latest patents is a heat transfer pipe designed for refrigerant mixtures. This innovative pipe aims to enhance heat transfer performance in condensers and evaporators within refrigerating cycles. The design features main grooves and auxiliary grooves on the inner surface, which intersect to optimize heat transfer efficiency. The main grooves are separated by ridges, which are further divided into ribs by the auxiliary grooves. This configuration allows for a longer rib length compared to the ridges, and the auxiliary grooves are strategically sized to reduce pressure gradients within the pipe.

Another notable patent is a heat exchanger that consists of multiple overlapping units, each formed by inserting fins over heat transfer tubes. The fins are engineered to ensure that opposing fins from different units make contact at specific points. This design is particularly effective when the heat exchanger units are arranged in a gravity direction, allowing it to function as an air conditioner.

Career Highlights

Masaaki Itoh has had a distinguished career, working with reputable companies such as Hitachi, Ltd. and Hitachi Cable, Inc. His experience in these organizations has significantly influenced his innovative approach to heat transfer technologies.

Collaborations

Throughout his career, Itoh has collaborated with notable colleagues, including Mari Uchida and Hideyuki Kimura. These partnerships have contributed to the development of his groundbreaking inventions.

Conclusion

Masaaki Itoh's work in heat transfer technology has led to significant advancements in refrigeration and air conditioning systems. His innovative patents reflect his expertise and commitment to improving energy efficiency in these essential technologies.

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