Growing community of inventors

Yokohama, Japan

Naoki Numa

Average Co-Inventor Count = 3.69

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 = 260

Naoki NumaRyo Igarashi (4 patents)Naoki NumaHiroshi Masunaga (3 patents)Naoki NumaKen Nakayama (3 patents)Naoki NumaTetsuya Narita (1 patent)Naoki NumaNaoki Numa (4 patents)Ryo IgarashiRyo Igarashi (61 patents)Hiroshi MasunagaHiroshi Masunaga (21 patents)Ken NakayamaKen Nakayama (14 patents)Tetsuya NaritaTetsuya Narita (10 patents)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Okamura Corporation (4 from 421 patents)


4 patents:

1. 7246859 - Chair

2. 7243993 - Tilting mechanism for a chair and a chair having the same

3. 7097249 - Tilting mechanism for a chair and chair having the same

4. 6942300 - Structure for mounting a net member to a frame for a seat or backrest of a chair

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as of
12/17/2025
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