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3485656
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Patent number 3,485,656
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Issue date Dec 23, 1969
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D21 - PAPER-MAKING PRODUCTION OF CELLULOSE
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2414251
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Patent number 2,414,251
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Issue date Jan 14, 1947
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D06 - TREATMENT OF TEXTILES OR THE LIKE LAUNDERING FLEXIBLE MATERIALS NOT OTH...
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2370090
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Patent number 2,370,090
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Issue date Feb 20, 1945
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D21 - PAPER-MAKING PRODUCTION OF CELLULOSE
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2287849
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Patent number 2,287,849
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Issue date Jun 30, 1942
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D21 - PAPER-MAKING PRODUCTION OF CELLULOSE