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Process for producing a porous film
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Patent number 4,921,652
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Issue date May 1, 1990
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Mitsui Toatsu Chemicals, Inc.
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Syoichi Tsuji
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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Method of forming a porous polyolefin film
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Patent number 4,921,653
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Issue date May 1, 1990
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Mitsui Toatsu Chemicals, Inc.
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Mari Aoyama
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Preparation of gas permeable porous film
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Patent number 4,814,124
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Issue date Mar 21, 1989
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Mitsui Toatsu Chemicals Inc.
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Mari Aoyama
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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