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Surfboard construction
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Patent number 4,961,715
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Issue date Oct 9, 1990
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Dennis A. Shanelec
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B63 - SHIPS OR OTHER WATERBORNE VESSELS RELATED EQUIPMENT
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Method for producing polypropylene foam
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Patent number 4,882,108
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Issue date Nov 21, 1989
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Mitsubishi Petrochemical Co., Ltd.
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Yoshio Nakajima
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Pre-expanded particles of propylene resin
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Patent number 4,761,431
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Issue date Aug 2, 1988
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Kanegafuchi Kagaku Kogyo Kabushiki Kaisha
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Kyoichi Nakamura
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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Pre-expanded particles of propylene resin
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Patent number 4,720,509
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Issue date Jan 19, 1988
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Kanegafuchi Kagaku Kogyo Kabushiki Kaisha
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Kyoichi Nakamura
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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