Patents by Inventor Robert Z. Fowler

Robert Z. Fowler 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).

  • Patent number: 4807835
    Abstract: The attitude of a spacecraft can be effectively controlled in three axes using the combination of a gravity gradient boom and three electromagnets. The electromagnets are controlled according to a control law that takes into consideration signals from a magnetometer and a signal indicating the orbital angular velocity of the spacecraft.During the acquisition phase of the flight, the gravity gradient boom is not extended and electromagnets are operated according to a control law that only takes into account the output of the magnetometer. After the acquisition phase is complete, the gravity gradient boom is extended and the spacecraft enters the libration phase of the flight. In the libration phase of the flight, electromagnets are controlled according to a control law that takes into account both the output of the magnetometer and a signal which indicates the orbital angular velocity of the spacecraft.
    Type: Grant
    Filed: April 10, 1987
    Date of Patent: February 28, 1989
    Assignee: Ithaco, Inc.
    Inventor: Robert Z. Fowler
  • Patent number: 3958078
    Abstract: Articles such as glass jars filled with food products are inspected for defects by scanning an x-ray image to provide video signals which are processed in a novel manner to provide increased sensitivity to detect very small foreign particles without decreasing a tolerance for normal variations, to inspect substantially the entire contents of a container such as a jar even if it has a varying diameter, without the need for precise positioning of the articles within an inspection zone, and without a need for an x-ray or optical mask tailored to fit each type of jar to be inspected.
    Type: Grant
    Filed: August 30, 1974
    Date of Patent: May 18, 1976
    Assignee: Ithaco, Inc.
    Inventors: Robert Z. Fowler, Bruno W. Hautaniemi, Edgar W. Seymour, Hans G. Jorgensen