Patents by Inventor Rudolf Bohm

Rudolf Bohm 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).

  • Patent number: 4168839
    Abstract: An improved tool for installing captive type spark plug gaskets upon a spark plug body characterized in the provision of a staking member which contacts the inwardly directed locking flange of a gasket in such manner as to form undulations in the plane thereof to provide the equivalent of metal thickness which is appreciably thicker than the original thickness of metal stock from which the gasket is formed. During a staking operation, the inwardly directed flange is further inwardly folded to reduce the effective diameter of the free edge portion thereof, so as to be positioned to lie upon the unthreaded undercut area adjacent the lower transverse surface of the plug body. Because of the effective increased thickness of the free edge of the inwardly folded flange, cross threading with respect to the thread of the shank does not occur when the plug is unthreaded from an engaged cylinder head opening, and the gasket remains captive on removal.
    Type: Grant
    Filed: March 18, 1977
    Date of Patent: September 25, 1979
    Assignee: Harold P. Hopp
    Inventors: Harold P. Hopp, Rudolf Bohm
  • Patent number: 3988683
    Abstract: A method for generating switching signals from an alternating current containing a harmonic or from a mixture of at least two alternating currents containing harmonics with adjacent fundamentals, characterized in that one even and one odd harmonic is filtered from the frequency range, then they are amplified, rectified and compared, and a switching signal is generated when a given and adjustable ratio is achieved between these two potentials, for instance when the ratio is unity.
    Type: Grant
    Filed: March 4, 1975
    Date of Patent: October 26, 1976
    Assignee: Ernst Leitz G.m.b.H.
    Inventors: Rudolf Bohme, Klaus Heinecke, Fromund Hock