Patents by Inventor Jean-Luc Abraham

Jean-Luc Abraham 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).

  • Method for monitoring oil flow in an oil-lubricated vacuum pump
    Patent number: 4895220
    Abstract: The temperature of the oil or the temperature of the cooling medium at the inlet side and at the outlet side of the oil cooler is measured and the two temperature values are compared to each other and, in the event the temperatures exceed or fall below the pre-set temperature difference, a warning signal is actuated.
    Type: Grant
    Filed: August 23, 1988
    Date of Patent: January 23, 1990
    Assignee: Leybold Aktiengesellschaft
    Inventors: Jean-Luc Abraham, Jean-Luc Chavand, Frederic Jeziorowski