Growing community of inventors

Tokyo, Japan

Kazufumi Sei

Average Co-Inventor Count = 1.95

ph-index = 7

The patent ph-index is calculated by counting the number of publications for which an author has been cited by other authors at least that same number of times.

Forward Citations = 92

Kazufumi SeiHiroshi Yamamoto (8 patents)Kazufumi SeiKenji Kimura (7 patents)Kazufumi SeiYu Sakata (1 patent)Kazufumi SeiShinichi Ohtsuki (1 patent)Kazufumi SeiKazufumi Sei (12 patents)Hiroshi YamamotoHiroshi Yamamoto (107 patents)Kenji KimuraKenji Kimura (14 patents)Yu SakataYu Sakata (18 patents)Shinichi OhtsukiShinichi Ohtsuki (7 patents)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Victor Company of Japan, Limited (11 from 2,887 patents)

2. Jvc Kenwood Corporation (1 from 1,368 patents)


12 patents:

1. D684148 - Hands free accessory for wireless telephones

2. D590363 - Digital video disc player for automobile

3. D580412 - Loudspeaker for vehicle

4. D576160 - Digital audio disc player with radio tuner for automobile

5. D576153 - Loudspeaker for vehicle

6. D574812 - Loudspeaker for vehicle

7. D564509 - Disc player with radio tuner

8. D563952 - Disc player with radio tuner

9. D544860 - Disc player with radio tuner

10. D541795 - Disc player with radio tuner

11. D538798 - Disc player with radio tuner

12. D535958 - Disc player

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as of
1/4/2026
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