Patents by Inventor Roland Krewenka

Roland Krewenka 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).

  • Device for electromagnetically securing a lock barrel
    Patent number: 5699686
    Abstract: The device for electromagnetically blocking the closing cylinder (2) of a lock (1) includes a rotary drive comprising a coil (12) and a rotor (7). Depending on the rotary position of the rotor (7), the movable tumbler (4) may be disengaged from the recess (3) of the locking cylinder. In the blocking position, disengagement is prevented by abutment on the end face (11) of the rotor. (FIG.
    Type: Grant
    Filed: February 22, 1996
    Date of Patent: December 23, 1997
    Assignee: EVVA-Werk Spezialerzeugung von Zylinder- und Sicherheitsschlossern Gesellschaft m.b.H. & Co.
    Inventors: Harald Neumayer, Roland Krewenka