1933

Harry V. CHURCHILL, New Kensington, Pa.: "Removal of fluorine from water", US Patent 2,059,553; filed Oct. 2, 1933; granted Nov. 3, 1936 (using activated alumina)

Harry V. CHURCHILL, New Kensington, Pa.: "Softening water", US Patent 2,059,552; filed Oct. 2, 1933; granted Nov. 3, 1936 (activated alumina)

Gotthold Harry MEINZER, Glendale, CA: "Method of removing fluorine from potable waters", US Patent 2,043,705; filed Nov. 28, 1933; granted June 9, 1936

1934

Ralph H. McKEE, William S. JOHNSTON, New York: "Process of Removing Fluorides from Water", US Patent 2,072,376; filed Nov. 14, 1934; granted March 2, 1937

"An aluminum and sand filter that removes fluorine from water has been devised by Dr. S. P. Kramer, of Fort Thomas, Ky." (Kramer S.P: Science 80 (Dec. 21, 1934), 593; Science 81: Suppl. (Feb. 15, 1935) 9)

1936

Paul C. GOETZ, Mount Holly, N.J., assignor to The Permutit Company, New York: "Removing fluorides from water", US Patent 2,139,227; filed Sept. 12, 1936; granted Dec. 6, 1938

The Permutit Company Limited, formerly known as United Water Softeners Limited, London, Great Britain: "Improvements in the treatment of water", British Patent (GB) 490,972; (US Priority Sept. 12, 1936), filed Sept. 13, 1937; granted Aug. 24, 1938

Howard ADLER, Flossmoor, Ill., assignor to Victor Chemical Works: "Treatment of water for the removal of fluorine", US Patent 2,262,745; filed Oct. 30, 1936; granted Nov. 18, 1941

1937

Elias ELVOVE, Washington D.C., assignor to the Government of the United States of America, as represented by the Secretary of the Treasury: "Removal of fluorides from drinking water", US Patent 2,207,725; filed Febr. 12, 1937; granted July 16, 1940 (Magnesium oxide patent)

Elias ELVOVE, Washington D.C., assignor to the Government of the United States of America, as represented by the Secretary of the Treasury: "Removing fluorides from drinking water", US Patent 2,257,111; filed Febr. 12, 1937; granted Sept. 30, 1941 (tricalcium phosphate patent)

Oliver M. URBAIN, William R. STEMEN, Columbus, Ohio, assignors to Charles H. Lewis, Harpster, Ohio: "Purification of potable water", US Patent 2,210,965; filed July 3, 1937; granted Aug. 13, 1940

Oliver M. URBAIN, William R. STEMEN, Columbus, Ohio, assignors to Charles H. Lewis, Harpster, Ohio: "Purification of potable water", US Patent 2,210,966; filed July 3, 1937; granted Aug. 13, 1940

Walter H. McINTIRE, Knoxville, Tenn.: "Removing fluorides from water", US Patent 2,126,793; filed Nov. 12, 1937; granted Aug. 16, 1938

John R. BAYLIS, Chicago, Ill., assignor to City of Chicago: "Composition of matter for water treatment", US Patent 2,217,466; filed Sept. 17, 1937; granted Oct. 8, 1940

Oliver M. URBAIN, William R. STEMEN, Columbus, Ohio, assignors to Charles H. Lewis, Harpster, Ohio: "Process for removing fluorides from water", US Patent 2,268,971; filed Nov. 19, 1937; granted Jan. 6, 1942

1938

Abraham Sidney BEHRMAN, Chicago, Hilding B. GUSTAFSON, La Grange, Ill., assignors to International Filter Co., Chicago, Ill.: "Water purification", US Patent 2,227,432; filed March 14, 1938; granted Jan. 7, 1941

Howard ADLER, Flossmoor, Ill., assignor to Victor Chemical Works: "Treatment of tricalcium phosphate fro improving fluorine absorptiveness", US Patent 2,417,462; filed Aug. 24, 1938; granted March 18, 1947

Oliver M. URBAIN, William R. STEMEN, Columbus, Ohio, assignors to Charles H. Lewis, Harpster, Ohio: "Process for the removal of fluorides from water", US Patent 2,157,509; filed Nov. 27, 1935; renewed Oct. 18, 1938; granted May 9, 1939

Chester L. BAKER, Fenn Wynne, and Charles H. DEDRICK, Drexel Hill, Pa., assignors to Philadelphia Quartz Company: "Water Purification", US Patent 2,310,009; filed Sept. 21, 1938; granted Feb. 2, 1943

1939

Howard V. SMITH and Margaret C. SMITH, Tucson, Arizona: "Water Treatment", US Patent 2,380,800; filed May 20, 1939; granted July 31, 1945

Abraham Sidney BEHRMAN, Chicago, Hilding B. GUSTAFSON, La Grange, Ill., assignors to Infilco Incorporated: "Liquid Treatment", US Patent 2,376,897; filed Sept. 11, 1939; granted May 29, 1945

1940

Oliver M. URBAIN, Columbus, Ohio, assignor to Charles H. Lewis, Harpster, Ohio: "Process for the preparation of reagents for the treatment of liquids", US Patent 2,309,366; filed July 13, 1940, granted Jan. 26, 1943

1942

Robert J. MYERS, Rydal, and Donald S. HERR, Philadelphia, Pa., assignors to The Resinous Products & Chemical Company, Philadelphia, Pa.: "Removal of fluorine from water", US Patent 2,373,632; filed June 24, 1942; granted April 10, 1945; Brit. Patent GB 569,307; filed May 25, 1943, granted May 17, 1945)

Société anonyme: Etablissements Phillips & Pain, résidant en France (Seine): "Perfectionnements aux procédés pour éliminer des eaux de la silice et éventuellement les fluorures", French Patent (FR) 892,300; filed Dec. 16, 1942; ("2 demandes de brevets déposées aux États Unis d´Amérique les 8 et 24 Juillet 1940), published April 3, 1944

1945

M. Kenneth COOKSON, Great Britain: "Procédé d´épuration des eaux potables", French Patent (FR) 911,584; filed June 18, 1945; published July 12, 1946

1947

Franz J. MAIER, Bethesda, Md.: "Water Purification", US Patent 2,531,451; filed Oct. 7, 1947; granted Nov. 28, 1950

1949

Franz J. MAIER, Chevy Chase, Md., assignor to the United States of America as represented by the Administrator, Federal Security Agency: "Process of regenerating the hydroxyapatite of tricalcium phosphate and trimagnesium phosphate for use as fluoride adsorbent reagents", US Patent 2,553,595; filed April 21, 1949; granted May 22, 1951

1964

Auguste Louis de LISLE, Scottsdale, Arizona, Frances L. de LISLE, heir of Auguste Louis de LISLE, deceased: "Means and method for defluoridation of water", US Patent 3,337,453; filed July 1, 1964; granted Aug. 22, 1967

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