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Underdrain filter block
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Patent number 10,052,572
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Issue date Aug 21, 2018
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Xylem Water Solutions Zelienople LLC
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Dean T. Berkebile
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Water purification device
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Patent number 9,352,252
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Issue date May 31, 2016
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LifeStraw SA
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Mikkel Vestergaard Frandsen
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Filter cleaning method
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Patent number 3,932,278
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Issue date Jan 13, 1976
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Sterling Drug Inc.
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John A. Meidl
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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3616924
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Patent number 3,616,924
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Issue date Nov 2, 1971
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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3512644
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Patent number 3,512,644
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Issue date May 19, 1970
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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3405872
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Patent number 3,405,872
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Issue date Oct 15, 1968
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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3216575
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Patent number 3,216,575
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Issue date Nov 9, 1965
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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3078188
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Patent number 3,078,188
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Issue date Feb 19, 1963
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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2935195
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Patent number 2,935,195
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Issue date May 3, 1960
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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2910182
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Patent number 2,910,182
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Issue date Oct 27, 1959
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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2769547
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Patent number 2,769,547
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Issue date Nov 6, 1956
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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2459353
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Patent number 2,459,353
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Issue date Jan 18, 1949
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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2075300
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Patent number 2,075,300
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Issue date Mar 30, 1937
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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1700160
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Patent number 1,700,160
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Issue date Jan 29, 1929
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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1694467
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Patent number 1,694,467
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Issue date Dec 11, 1928
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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1640249
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Patent number 1,640,249
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Issue date Aug 23, 1927
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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1433357
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Patent number 1,433,357
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Issue date Oct 24, 1922
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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1189521
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Patent number 1,189,521
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Issue date Jul 4, 1916
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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1114763
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Patent number 1,114,763
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Issue date Oct 27, 1914
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL