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For the Inventor, By the Inventor

Tokyo, Japan

Riken Piston Ring Industrial Co. Ltd.


USPTO Granted Patents = 3

Forward Citations = 29

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3 inventors (with patents filed for the assignee):

goldMedal Yuichi Tanaka (2 out of 2 patents)

silverMedal Katsuya Ikawa (2 out of 2 patents)

bronzeMedal Kazutoshi Takemura (1 out of 2 patents)


3 patents:

1. 4233073 - Iron-base sintered alloy for valve seat and method of making the same (1980-11-11),
2. 4099994 - High duty ductile case iron and its heat treatment method (1978-07-11),
3. 4096002 - High duty ductile cast iron with superplasticity and its heat treatment (1978-06-20),
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USPTO Data Jan 1 1976 - Dec 16 2025

3 Patents

#3,267 in Tokyo

#8,766 in Japan

...
Tokyo, Japan

Riken Piston Ring Industrial Co. Ltd.

Forward Citations = 29

3 inventors:

goldMedal Yuichi Tanaka (2 out of 2 patents)

silverMedal Katsuya Ikawa (2 out of 2 patents)

bronzeMedal Kazutoshi Takemura (1 out of 2 patents)

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