For the Inventor, By the Inventor

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Kumalift Engineering Laboratory Co., Ltd.

USPTO Granted Patents = 2

Forward Citations = 13

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4 inventors (with patents filed for the assignee):

Keiichi Yamada (1 out of 6 patents)

Chiaki Murata (1 out of 10 patents)

Masaru Muranaka (1 out of 1 patent)

4. Tomoko Kawakami (1 out of 1 patent)

2 patents: Sort by Forward Citations

1. D599256 - Stair-climbing chair (2009-09-01),

2. D489859 - Chair for stair elevating lift (2004-05-12),

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USPTO Data Jan 1 1976 - Dec 30 2025

2 Patents

#1,025 in Osaka

#10,973 in Japan

Kumalift Engineering Laboratory Co., Ltd.

Forward Citations = 13

4 inventors:

Keiichi Yamada (1 out of 6 patents)

Chiaki Murata (1 out of 10 patents)

Masaru Muranaka (1 out of 1 patent)

4. Tomoko Kawakami (1 out of 1 patent)

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