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For the Inventor, By the Inventor

Tokorozawa, Japan

Shigehiko Yamamoto

USPTO Granted Patents = 14

Average Co-Inventor Count = 3.6

ph-index = 7

Forward Citations = 140(Granted Patents)


Location History:

  • Tokorozawa, JA (1976)
  • Saitama, JP (1987)
  • Tokorozawa, JP (1980 - 1989)

Company Filing History:

goldMedal14 out of 42,485 
 
Hitachi, Ltd.
 patents

Years Active: 1976-1989

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14 patents (USPTO):Explore Patents
1. 4855637 - Oxidation resistant impregnated cathode (1989-08-08),
2. 4783613 - Impregnated cathode (1988-11-08),
3. 4737679 - Impregnated cathode (1988-04-12),
4. 4687930 - Ion beam apparatus (1987-08-18),
5. 4639377 - Thin film formation technique and equipment (1987-01-27),
6. 4626470 - Impregnated cathode (1986-12-02),
7. 4518890 - Impregnated cathode (1985-05-21),
8. 4379250 - Field emission cathode and method of fabricating the same (1983-04-05),
9. 4310777 - Directly heated cathode for electron tube (1982-01-12),
10. 4291252 - Electron tube cathode (1981-09-22),
11. 4260665 - Electron tube cathode and method for producing the same (1981-04-07),
12. 4193013 - Cathode for an electron source and a method of producing the same (1980-03-11),
13. 3945698 - Method of stabilizing emitted electron beam in field emission electron (1976-03-23),
14. 3932314 - Hexaboride electron emissive material (1976-01-13),

Title: Shigehiko Yamamoto: Innovator in Cathode Technology

Introduction

Shigehiko Yamamoto is a prominent inventor based in Tokorozawa, Japan. He has made significant contributions to the field of cathode technology, holding a total of 14 patents. His work focuses on developing advanced materials that enhance the performance and longevity of cathodes used in various applications.

Latest Patents

Yamamoto's latest patents include innovative designs for oxidation-resistant impregnated cathodes. One notable invention is an impregnated cathode that features a refractory porous substrate impregnated with an electron emissive material containing barium. This cathode is designed with multiple thin films made of high melting metals and scandium, which maintain excellent emission characteristics even after the sealing off step of tube production. Another significant patent involves an impregnated cathode that comprises a refractory porous body with a thin film layer of tungsten and scandium oxides. This design is characterized by its distinguished electron emission properties and extended lifespan.

Career Highlights

Shigehiko Yamamoto has built a successful career at Hitachi, Ltd., where he has been instrumental in advancing cathode technology. His innovative approaches have led to the development of materials that significantly improve the efficiency and durability of electronic components.

Collaborations

Yamamoto has collaborated with notable colleagues such as Sadanori Taguchi and Toshiyuki Aida. These partnerships have fostered a creative environment that encourages the exchange of ideas and the development of groundbreaking technologies.

Conclusion

Shigehiko Yamamoto's contributions to cathode technology exemplify the impact of innovative thinking in the field of electronics. His patents reflect a commitment to enhancing the performance and reliability of electronic components, making him a key figure in this area of research.

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