Masao Hirayama

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Settsu, JP

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Patents Grantslast 30 patents

Information Patent Grant
Method and apparatus for providing the inner surface of a pipe line...
- Patent number 4,350,548
- Issue date Sep 21, 1982
- Tokyo Gas Co., Ltd.
- Katsuaki Zenbayashi
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Method for smoothly evaginating a tubular material under pressure
- Patent number 4,334,943
- Issue date Jun 15, 1982
- Tokyo Gas Kabushiki Kaisha
- Katsuaki Zenbayashi
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL