Patents by Inventor Henry P. Karwan

Henry P. Karwan 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).

  • Electronic depth control for drill
    Patent number: 4765784
    Abstract: A drilling system for drilling circuit boards includes means for precisely controlling the depth of drilling despite surface variations in the circuit boards. The system includes a detection circuit for detecting contact between the circuit board and drill and control circuitry for thereafter causing the drill to move a predetermined distance corresponding to the desired drilling depth.
    Type: Grant
    Filed: December 6, 1984
    Date of Patent: August 23, 1988
    Assignee: Advanced Controls, Inc.
    Inventor: Henry P. Karwan
  • Solar energy collector system
    Patent number: 4432343
    Abstract: A trough-like concentrator having a reflective surface contoured to image the sun at a linear focus. The reflective surface is supported by a structural tube having plural ribs.A microcomputer is programmed to exclusively aim the concentrator at the sun.A stationary vacuum-insulated linear solar energy receiver is positioned at the focus of the concentrator, with heat-transfer fluid entering at one end of the receiver and leaving at the other end.
    Type: Grant
    Filed: January 21, 1982
    Date of Patent: February 21, 1984
    Assignee: Viking Solar Systems, Incorporated
    Inventors: H. Norman Riise, George G. Goranson, Henry P. Karwan