Patents by Inventor Helmut Friedrich

Helmut Friedrich 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).

  • Apparatus for starting aircraft engines and for operating auxiliary on-board power generating equipment
    Patent number: 3965673
    Abstract: Two aircraft jet engines are associated respectively with two sub-systems each comprised of a gas turbine for starting one of the engines and driving a set of secondary power generators such as hydraulic pump and electric generator and an air conditioning unit. The two sub-systems are drivingly cross-linked so that either gas turbine can drive both sets. The air conditioning units as well as the gas turbines receive tapped air from the engine compressors, whereby the gas turbines may run with or without combustion. An emergency power pack may be provided, preferably in selective driving connection to one of the sub-systems to provide for the possibility of starting a gas turbine and driving, if necessary, the power generators of that sub-systems or furnishing hydraulic and electric power on a emergency basis when all sub-systems have failed.
    Type: Grant
    Filed: May 20, 1974
    Date of Patent: June 29, 1976
    Assignee: Vereinigte Flugtechnische Werke-Fokker Gesellschaft mit beschrankter Haftung
    Inventor: Helmut Friedrich
  • Anti-static modified thermoplastics
    Patent number: 3936422
    Abstract: Reaction products of mercaptans, ethylene oxide and/or propylene oxide with glycidol are effective antistatic agents when added to thermoplastics, and often also act as processing stabilisers.
    Type: Grant
    Filed: January 7, 1975
    Date of Patent: February 3, 1976
    Assignee: Ciba-Geigy Corporation
    Inventors: Hermann O. Wirth, Hans-Helmut Friedrich, Helmut Linhart
  • Hydrophilic and difficultly volatile biocidal triorganometallic compounds
    Patent number: 3933877
    Abstract: New triorganotin and triorganolead compounds which are hydrophilic and difficultly volatile are used as biocides.
    Type: Grant
    Filed: July 31, 1974
    Date of Patent: January 20, 1976
    Assignee: Ciba-Geigy Corporation
    Inventors: Hermann Otto Wirth, Hans Joachim Lorenz, Hans-Helmut Friedrich
  • Hydrophilic and difficultly volatile biocidal triorganotin compounds
    Patent number: 3931262
    Abstract: New triorganotin compounds which are hydrophilic and difficultly volatile are used as biocides.
    Type: Grant
    Filed: July 31, 1974
    Date of Patent: January 6, 1976
    Assignee: Ciba-Geigy Corporation
    Inventors: Hermann Otto Wirth, Hans Joachim Lorenz, Hans-Helmut Friedrich