Patents by Inventor Markus C. Kihlberg

Markus C. Kihlberg 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).

  • Hydraulic valve
    Patent number: 5222521
    Abstract: A high speed high-performance valve member has a spool that is movable within a cylindrical cavity of a valve body or sleeve. The spool and sleeve are both formed of hardened stainless steel, but the bearing surfaces and lands of the spool are provided with a deposition layer of titanium nitride to give the bearing surface a hard smooth finish. The differential hardness between the spool and sleeve prevents galling. Damage due to cavitation is avoided, and the valve has a failure rate reduced by a factor of about twenty.
    Type: Grant
    Filed: May 8, 1992
    Date of Patent: June 29, 1993
    Assignee: Moog Controls, Inc.
    Inventor: Markus C. Kihlberg