Growing community of inventors

Tokyo, Japan

Kei Kamiyama

Average Co-Inventor Count = 1.02

ph-index = 6

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 = 91

Kei KamiyamaRyo Sakai (1 patent)Kei KamiyamaKei Kamiyama (22 patents)Ryo SakaiRyo Sakai (90 patents)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Epoch Company, Ltd. (22 from 202 patents)


22 patents:

1. 12465868 - Table toy

2. 12458901 - Transformable toy for figure play

3. D1078907 - Ladder and slide toy

4. 12268976 - Toy for figure play

5. 12263417 - Model toy and cooking toy

6. 12263415 - Toy for figure play

7. 11478722 - Model toy and pan toy

8. 11179651 - Model toy and cooking appliance toy

9. D902326 - Toy ferris wheel

10. D901605 - Toy ride

11. D896323 - Toy car

12. D853499 - Toy railway

13. D825679 - Toy house

14. D825680 - Toy house

15. D825681 - Toy house

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as of
12/12/2025
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