Patents by Inventor Norbert Sendfeld

Norbert Sendfeld 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).

  • Adjustable length column for chairs and tables and length adjusting element therefor
    Patent number: 6402102
    Abstract: An adjustable length column for chairs and tables comprises an upright tube and a pneumatic or hydropneumatic length adjusting element, which is disposed therein concentrically of a common central longitudinal axis. The housing of the element has an outer surface, which is guided for displacement in the direction of the axis and radially supported in a guide bush which is disposed in the upright tube. The outer surface of the housing is unpolished, shot peened and has a browned layer.
    Type: Grant
    Filed: March 17, 2000
    Date of Patent: June 11, 2002
    Assignee: Suspa Holding GmbH
    Inventors: Norbert Sendfeld, Günter Ströber