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For the Inventor, By the Inventor

Tokyo, Japan

Naka Corporation


USPTO Granted Patents = 3

Forward Citations = 176

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6 inventors (with patents filed for the assignee):

goldMedal Hiromasa Naka (3 out of 4 patents)

silverMedal Takehiko Okushima (3 out of 4 patents)

bronzeMedal Takao Okumura (3 out of 4 patents)

4.  Tetsuo Tobikawa (3 out of 3 patents)

5.  Tatsuo Shoji (3 out of 4 patents)

6.  Norio Nakamura (2 out of 43 patents)


3 patents:

1. 5162612 - Closure plate for covering opening of floor panels (1992-11-10),
2. 5072557 - Device for fixing floor panels (1991-12-17),
3. 4996804 - Device and structure for supporting floor panels (1991-03-05),
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USPTO Data Jan 1 1976 - Sep 15 2026

3 Patents

#3,556 in Tokyo

#8,949 in Japan

Tokyo, JP
Tokyo, Japan

Naka Corporation

Forward Citations = 176

6 inventors:

goldMedal Hiromasa Naka (3 out of 4 patents)

silverMedal Takehiko Okushima (3 out of 4 patents)

bronzeMedal Takao Okumura (3 out of 4 patents)

4.  Tetsuo Tobikawa (3 out of 3 patents)

5.  Tatsuo Shoji (3 out of 4 patents)

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