Patents by Inventor Jean Michel Ducrohet

Jean Michel Ducrohet 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).

  • Arrangement for detecting the state of a tool
    Patent number: 3994612
    Abstract: A system is disclosed for detecting the state of a rotating machining tool, such as a drill bit, in a machining head. The system employs an electromagnetic detector having a coil connected in series with an oscillating circuit. As the tool rotates, its lands and flutes cause detectable variations in reluctance which are used to modulate the output of the oscillator circuit. The modulated oscillator output is monitored as an indication of the state of the tool.
    Type: Grant
    Filed: April 28, 1975
    Date of Patent: November 30, 1976
    Assignee: Regie Nationale des Usines Renault
    Inventor: Jean Michel Ducrohet
  • Arrangement for detecting the state of a tool
    Patent number: 3990805
    Abstract: A system is disclosed for detecting the state of a rotating machining tool, such as a drill bit, in a machining head. The system employs an electromagnetic detector having a coil connected in series with an oscillating circuit. As the tool rotates, its lands and flutes cause detectable variations in reluctance which are used to modulate the output of the oscillator circuit. The modulated oscillator output is monitored as an indication of the state of the tool.
    Type: Grant
    Filed: September 17, 1974
    Date of Patent: November 9, 1976
    Assignee: Regle Nationale des Usines Renault
    Inventor: Jean Michel Ducrohet