Growing community of inventors

Nagano, Japan

Keiji Ohta

Average Co-Inventor Count = 1.57

ph-index = 3

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 = 24

Keiji OhtaToshio Tatai (6 patents)Keiji OhtaTakeki Watanabe (4 patents)Keiji OhtaSatoshi Yokoyama (4 patents)Keiji OhtaRyo Uchiyama (3 patents)Keiji OhtaChisato Hiyama (2 patents)Keiji OhtaShigeki Oguchi (2 patents)Keiji OhtaShinya Miyazawa (1 patent)Keiji OhtaKatsuhisa Higashi (1 patent)Keiji OhtaMasahiro Ikeda (1 patent)Keiji OhtaYasuhiro Kitazawa (1 patent)Keiji OhtaMamoru Mizawa (1 patent)Keiji OhtaHiroshige Takeda (1 patent)Keiji OhtaNaohito Nakayama (1 patent)Keiji OhtaDavid Charles Carrington May (1 patent)Keiji OhtaKeiji Ohta (33 patents)Toshio TataiToshio Tatai (22 patents)Takeki WatanabeTakeki Watanabe (13 patents)Satoshi YokoyamaSatoshi Yokoyama (4 patents)Ryo UchiyamaRyo Uchiyama (8 patents)Chisato HiyamaChisato Hiyama (8 patents)Shigeki OguchiShigeki Oguchi (5 patents)Shinya MiyazawaShinya Miyazawa (19 patents)Katsuhisa HigashiKatsuhisa Higashi (19 patents)Masahiro IkedaMasahiro Ikeda (13 patents)Yasuhiro KitazawaYasuhiro Kitazawa (12 patents)Mamoru MizawaMamoru Mizawa (9 patents)Hiroshige TakedaHiroshige Takeda (5 patents)Naohito NakayamaNaohito Nakayama (3 patents)David Charles Carrington MayDavid Charles Carrington May (1 patent)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Nidec Sankyo Corporation (32 from 730 patents)

2. Nidec Instruments Corporation (1 from 24 patents)


33 patents:

1. 12530547 - Card insertion part and card reader

2. 12242907 - Card transport unit

3. 11995509 - Card processing device and cover member

4. 11900186 - Card reader

5. 11724903 - Card processing device

6. 11186096 - Card-issuing device

7. 10682867 - Card processing device

8. 10668360 - Card collection storage and card processing device

9. 10635953 - Card feed-out device

10. 10586134 - Card issuing device

11. 10552726 - Card-type medium counting mechanism, card-type medium housing device, and card housing device

12. 9751707 - Card conveying mechanism and card issuing device

13. 9656478 - Ink ribbon cassette, ink ribbon cartridge, printing device and control method for printing device

14. 9498996 - Ink ribbon cassette, ink ribbon cartridge, printing device and control method for printing device

15. 9381764 - Ink ribbon cassette, ink ribbon cartridge, printing device and control method for printing device

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as of
1/22/2026
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