Patents by Inventor Hans-Joachim Maulhardt

Hans-Joachim Maulhardt 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).

  • Cooling agent mixture containing ethylene glycol monoacetate, ethylene glycol diacetate, and glycol monomethyl ether for low-temperature freezing processes
    Patent number: 4192760
    Abstract: A cooling agent mixture useful in low-temperature freezing processes is disclosed. The mixture comprises, based upon the total weight of the mixture, from about 15 to about 35% ethylene glycol monoacetate and ethylene glycol diacetate, the ratio of the monoacetate to the diacetate being from about 1:9 to about 9:1; and from about 35 to about 65% glycol monomethyl ether. The mixture may also comprise from about 0 to about 18% monovalent, short-chained alcohol, or mixture thereof, from about 0 to about 3% of a corrosion inhibitor, and from about 0 to about 40% water. The compositions have outstanding cooling characteristics and possess viscosities acceptable for use in typical cooling installations.
    Type: Grant
    Filed: June 12, 1978
    Date of Patent: March 11, 1980
    Assignee: Akzona Incorporated
    Inventors: Rudolf Junger, Hans-Joachim Maulhardt