Growing community of inventors

Hitachinaka, Japan

Keiji Nagayama

Average Co-Inventor Count = 2.92

ph-index = 4

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 = 86

Keiji NagayamaTomishige Yatsugi (4 patents)Keiji NagayamaHisashi Inoue (3 patents)Keiji NagayamaJunji Shiokawa (2 patents)Keiji NagayamaKazuto Yoneyama (2 patents)Keiji NagayamaYuichi Katano (2 patents)Keiji NagayamaSusumu Yoshida (1 patent)Keiji NagayamaTamotsu Ito (1 patent)Keiji NagayamaAkinobu Watanabe (1 patent)Keiji NagayamaYasunori Ohara (1 patent)Keiji NagayamaHiroyuki Hayakawa (1 patent)Keiji NagayamaKatsuhiko Tonami (1 patent)Keiji NagayamaToshiya Mizushima (1 patent)Keiji NagayamaKeiji Nagayama (9 patents)Tomishige YatsugiTomishige Yatsugi (31 patents)Hisashi InoueHisashi Inoue (4 patents)Junji ShiokawaJunji Shiokawa (79 patents)Kazuto YoneyamaKazuto Yoneyama (14 patents)Yuichi KatanoYuichi Katano (2 patents)Susumu YoshidaSusumu Yoshida (62 patents)Tamotsu ItoTamotsu Ito (44 patents)Akinobu WatanabeAkinobu Watanabe (27 patents)Yasunori OharaYasunori Ohara (10 patents)Hiroyuki HayakawaHiroyuki Hayakawa (7 patents)Katsuhiko TonamiKatsuhiko Tonami (3 patents)Toshiya MizushimaToshiya Mizushima (1 patent)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Hitachi, Ltd. (8 from 42,517 patents)

2. Samsung Electronics Co., Ltd. (1 from 131,906 patents)


9 patents:

1. 8270816 - Information recording and/or playback apparatus

2. 8224151 - Apparatus for recording and reproducing digital image and speech

3. 8009536 - Recording and reproducing apparatus

4. 7885515 - Recording/reproducing device and recording/reproduction method

5. 7193946 - Information recording apparatus and method

6. 7106954 - Digital camcorder

7. 6876612 - Information recording apparatus and method

8. 6445654 - Recording/reproducing method and device with supplementary data storage and output

9. 6226449 - Apparatus for recording and reproducing digital image and speech

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as of
1/10/2026
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