Patents by Inventor Walter Frey

Walter Frey has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Bath container for a refrigeration equipment
    Patent number: 4315416
    Abstract: A bath container for cooling a liquid contained therein for use in refrigeration equipment includes a jacket bounding a space for the liquid which comprises a side wall and a bottom wall. The side wall of the jacket is formed of two individual walls spaced from one another to form a hollow chamber therebetween which chamber is connected to a refrigerant feeding member and to a refrigerant discharging member whereby the jacket forming the hollow chamber and adapted to pass the refrigerant therethrough functions as an evaporator. A surface heating element including a heating wire inserted into a relatively thick insulating packing is mounted on the surface of the bottom side to supply heat to the working liquid contained in the bath container.
    Type: Grant
    Filed: September 18, 1980
    Date of Patent: February 16, 1982
    Inventors: Walter Frey, Rolf Kaiser
  • Method of separating high-boiling or non-volatile materials
    Patent number: 4110370
    Abstract: In the oxidation of propylene and/or acrolein, high-boiling or non-volatile byproducts are separated from the solvents used for absorbing the acrylic acid by treating the said solvents laden with byproducts with the hot reaction gases in such amounts that the major portion of the solvents evaporates, the residual solvent containing a high percentage of said byproducts then being discarded or worked up.
    Type: Grant
    Filed: October 7, 1975
    Date of Patent: August 29, 1978
    Assignee: BASF Aktiengesellschaft
    Inventors: Heinz Engelbach, Richard Krabetz, Gerd Duembgen, Carl-Heinz Willersinn, Walter Frey, Ulrich Lebert, Fritz Thiessen
  • Catalytic oxidation of .alpha.-olefins
    Patent number: 4052450
    Abstract: In the oxidation of .alpha.-olefins in the gas phase to .alpha.,.beta.-olefinically unsaturated aldehydes and carboxylic acids with molecular oxygen in the presence of an inert gas using a catalyst containing molybdenum and bismuth with elements as oxides or mixed oxides at from 280.degree. to 450.degree. C a content of indium and/or aluminum and/or lanthanum and/or gallium as oxide or mixed oxide results in an improvement in the conversion and/or activity and/or life of the catalyst.
    Type: Grant
    Filed: October 10, 1973
    Date of Patent: October 4, 1977
    Assignee: BASF Aktiengesellschaft
    Inventors: Richard Krabetz, Heinz Engelbach, Ulrich Lebert, Walter Frey, Gerd Duembgen, Fritz Thiessen, Carl-Heinz Willersinn
  • Recovering anhydrous acrylic acid
    Patent number: 3932500
    Abstract: Acrylic acid practically devoid of water, acrolein, formaldehyde and acetic acid is obtained at particularly low cost by countercurrent scrubbing and quenching of the reaction gas formed in the catalytic oxidation of propylene and/or acrolein with a high-boiling, extremely hydrophobic solvent followed by processing of the extract.
    Type: Grant
    Filed: July 17, 1972
    Date of Patent: January 13, 1976
    Assignee: Badische Anilin- & Soda-Fabrik Aktiengesellschaft
    Inventors: Gerd Duembgen, Heinz Engelbach, Walter Frey, Richard Krabetz, Ulrich Lebert, Hermann Spitzl, Fritz Thiessen, Carl-Heinz Willersinn