1900

SOCIÉTÉ POULENC FRÈRES and MAURICE MESLANS, Paris: "Apparat zur elektrolytischen Darstellung von Fluor", German Patent (DE) 129,825; filed June 27, 1900; granted April 14, 1902

1919

Frank C. MATHERS, Bloomington, Indiana: "Method of making fluorine", US Patent 1,484,733; filed June 30, 1919; granted Feb. 26, 1924; and "Method and apparatus for making fluorine", US Patent 1,484,734; filed July 7, 1919; pat. Feb. 26, 1924

1926

Paul Marie Alfred LEBEAU, Massy, and Augustin Amédée Joseph DAMIENS, Sévres, France: "Elektrolytische Herstellung von Fluor", German Patent (DE) 476,732; filed Dec. 7, 1926; granted June 19, 1929

1928

Karl FREDENHAGEN, Greifswald: "Verfahren zur elektrolytischen Gewinnung von Fluor", German Patent (DE) 493,873; filed July 18, 1928; granted March 20, 1930; and DE 511,808; filed July 18, 1928; granted Nov. 5, 1930; and US Patent 1,866,969; "Electrolytic Production of Fluorine"; filed July 11, 1929; granted July 12, 1932

1929

Heinz KREKELER, assignor to I.G. Farbenindustrie Akt.-Ges., Frankfurt: "Verfahren zur Herstellung von gasförmigem Fluor", German Patent (DE) 522,885; filed Dec. 6, 1929; pat. Apr. 16, 1931

1930

Arthur CARPMAEL, as communicated by I. G. Farbenindustrie Aktiengesellschaft, Frankfurt, Germany: "Process for the electrolytic manufacture of gaseous fluorine", British Patent GB 346,774; filed Jan. 9, 1930; granted April 9, 1931

Friedrich-August HENGLEIN, Friedrich-Wilhelm STAUF, assignors to I.G. Farbenindustrie, Aktiengesellschaft of Frankfurt: "Herstellung von Fluor", German Patent (DE) 555,528, filed May 17, 1930; granted July 7, 1932

Heinz KREKELER, Berlin, assignor to I.G. Farbenindustrie, Aktiengesellschaft of Frankfort-on-the-Main, Germany: "Manufacture of Fluorine", US Patent 1,863,661; filed Dec. 4, 1930; granted June 21, 1932

1932

William S. CALCOTT and Anthony F. BENNING, Pennsgrove, N.J., assignors to E. I. DuPont de Nemours & Company, Wilmington, Delaware: "Process and Apparatus", US Patent 2,034,458; filed Oct. 31, 1932; granted March 17, 1936 

1943

Walter C. SCHUMB, Milton, and Arthur J. STEVENS, Holliston, Mass., assignors, by mesne assignments, to United States of America, as represented by the Director, Office of Scientific Research and Development: "Production of Fluorine", US Patent 2,422,590; filed Jan. 21, 1943; granted June 17, 1947

1944

Ralph C. DOWNING, Wilmington,.Del., assignor to the United States of America as represented by the United States Atomic Energy Commission: "Manufacture of Fluorine by Electrolysis", US Patent 2,540,248; filed Oct. 31, 1944; granted Feb. 6, 1951

1946

George C. WHITAKER, Brooklyn Heights, Ohio, assignor to the United States of America as represented by the United States Atomic Energy Commission: "Electrolytic Process for Production of Fluorine", US Patent 2,506,438; filed May 14, 1946; granted May 2, 1950

1947

Carl F. SWINEHART, University Heights, Ohio, assignor to the Harshaw Chemical Company, Cleveland, Ohio: "Electrolytic Production of Fluorine", US Patent 2,534,638; filed Dec. 17, 1947; granted Dec. 19, 1950

1949

William Norman HOWELL, Hale, Liverpool, and Harold HILL, Runcorn, England, assignors to Imperial Chemical Industries Limited: "Process for the electrolytic production of fluorine", US Patent 2,592,144; filed May 11, 1949; granted April 8, 1952

1952

William T. GRUBB jr., Schenectady, N.Y., assignor to General Electric Company: "Electrolytic method of producing fluorine or fluorine oxide", US Patent 2,716,632; filed Feb. 21, 1952; granted Aug. 30, 1955

1974

Peter KAUDEWITZ, and Hubert FRIEDRICH, both of Bad Wimpfen, Germany, assignors to Kali-Chemie Fluor GmbH, of Bad Wimpfen, Germany: "Process for the production of elemental fluorine by electrolysis", US Patent 3,860,504; filed March 12, 1974; pat. Jan. 14, 1975

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