Patents by Inventor Kord Witte

Kord Witte 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 and device for polarizing a piezoelectric actuator
    Patent number: 7550903
    Abstract: In a method and device for polarizing a piezoelectric actuator according to which high-frequency pulse voltages can be used for polarizing the actuators an actuator to be polarized is mounted between two retaining elements while connected in series to a second piezoelectric actuator. The retaining elements provide the actuator (1) with a desired pretension. A compensating element compensates for changes in length of the actuator (1) so that even in the event of high-frequency pulse voltages and thus high-frequency changes in length, the pretension can be maintained within a desired range of values. Preferably, the second piezoelectric actuator has the identical design of the first actuator and is polarized with the first actuator. This enables two piezoelectric actuators to be simultaneously polarized during a polarizing process.
    Type: Grant
    Filed: January 19, 2005
    Date of Patent: June 23, 2009
    Assignee: Siemens Aktiengesellschaft
    Inventors: Bernhard Döllgast, Roland Niefanger, Kord Witte
  • Method and Device for Polarizing a Piezoelectric Actuator
    Publication number: 20080265715
    Abstract: In a method and device for polarizing a piezoelectric actuator according to which high-frequency pulse voltages can be used for polarizing the actuators an actuator to be polarized is mounted between two retaining elements while connected in series to a second piezoelectric actuator. The retaining elements provide the actuator (1) with a desired pretension. A compensating element compensates for changes in length of the actuator (1) so that even in the event of high-frequency pulse voltages and thus high-frequency changes in length, the pretension can be maintained within a desired range of values. Preferably, the second piezoelectric actuator has the identical design of the first actuator and is polarized with the first actuator. This enables two piezoelectric actuators to be simultaneously polarized during a polarizing process.
    Type: Application
    Filed: January 19, 2005
    Publication date: October 30, 2008
    Inventors: Bernhard Dollgast, Roland Niefanger, Kord Witte