Patents by Inventor Hartland P. Klotz

Hartland P. Klotz 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).

  • Quiet key switch
    Patent number: 4859820
    Abstract: A key switch utilizing a buckling compression spring to move a switch actuator mechanism includes a cylindrical core of resilient material located within an opening formed by the coils of the compression spring to attenuate the acoustical energy generated by the buckling and unbuckling action of the spring.
    Type: Grant
    Filed: March 31, 1988
    Date of Patent: August 22, 1989
    Assignees: American Telephone and Telegraph Company, AT&T Information Systems Inc.
    Inventors: Casimer Gotfryd, Stephen L. Kay, Hartland P. Klotz, Robert M. Wentzel