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Shutdown, trilayer battery separator
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Patent number 5,691,077
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Issue date Nov 25, 1997
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Hoechst Celanese Corporation
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Wei-Ching Yu
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Shutdown, bilayer battery separator
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Patent number 5,565,281
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Issue date Oct 15, 1996
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Hoechst Celanese Corporation
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Wei-Ching Yu
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL