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CHARLES H LEWIS

CHARLES H

Active Patents

0

Total Holdings

4

Patent Holdings

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Patent No.	Title	Status	Filing Date	Grant Date	Claims	Actions
US2275210A	Process for liquid purification	Expired / Lapsed	1938-01-14	1942-03-03	0	Details
US2208172A	Process for treating liquids	Expired / Lapsed	1938-05-10	1940-07-16	0	Details
US2208171A	Process for treating liquids	Expired / Lapsed	1938-05-05	1940-07-16	0	Details
US2157511A	Process for effecting anion exchange	Expired / Lapsed	1937-05-19	1939-05-09	0	Details