Patents by Inventor Norbert Gerhardt

Norbert Gerhardt 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).

  • Apparatus for continuously applying a coating to a sheet of indeterminate length
    Patent number: 5746833
    Abstract: An apparatus for continuously applying a coating to a running web, includes an elastic doctor blade having first and second ends, a frontal ride adapted to be oriented towards the web and a reverse side opposite the frontal aide and adapted to be oriented away from the web. The apparatus further has a clamping device firmly holding the doctor blade by engagement therewith in a zone of the first end. The clamping device positions the doctor blade for contacting the web at the second end along a scraping line. The apparatus also has an inflatable actuator engaging the reverse side of the doctor blade between the clamping device and the first and of the doctor blade. The actuator has a pressurized state in which a surface portion of the actuator is enlarged by an inflating fluid towards the reverse side of the doctor blade for pressing it against the web. A fluid pressure source is connected to the in inflatable actuator.
    Type: Grant
    Filed: October 3, 1996
    Date of Patent: May 5, 1998
    Assignee: TZN Forschungs- und Entwicklungszentrum Unterluss GmbH
    Inventor: Norbert Gerhardt
  • Method of coating sheet material with an oscillating doctor blade
    Patent number: 5601868
    Abstract: An apparatus for continuously applying a coating to a running web, includes an elastic doctor blade having first and second ends, a frontal side adapted to be oriented towards the web and a reverse side opposite the frontal side and adapted to be oriented away from the web. The apparatus further has a clamping device firmly holding the doctor blade by engagement therewith in a zone of the first end. The clamping device positions the doctor blade for contacting the web at the second end along a scraping line. The apparatus also has an inflatable actuator engaging the reverse side of the doctor blade between the clamping device and the first end of the doctor blade. The actuator has a pressurized state in which a surface portion of the actuator is enlarged by an inflating fluid towards the reverse side of the doctor blade for pressing it against the web. A fluid pressure source is connected to the inflatable actuator.
    Type: Grant
    Filed: September 18, 1995
    Date of Patent: February 11, 1997
    Assignee: TZN Forschungs- und Entwicklungszentrum GmbH
    Inventor: Norbert Gerhardt