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Rotating self-cleaning screen
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Patent number 4,521,305
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Issue date Jun 4, 1985
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Troy M. Deal
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Filtering scraper
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Patent number 4,220,540
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Issue date Sep 2, 1980
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Tadashi Hagihara
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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2929507
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Patent number 2,929,507
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Issue date Mar 22, 1960
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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2022017
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Patent number 2,022,017
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Issue date Nov 26, 1935
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL