Patents by Inventor John H. Crews, Jr.

John H. Crews, Jr. 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).

  • Delamination test apparatus and method
    Patent number: 4926694
    Abstract: A delamination test apparatus and method uses a single beam to simultaneously apply opening and shear stresses to a test specimen. A fulcrum extending downwardly from the beam produces shear stress in the specimen by downward movement, and opening stress by pivotal upward movement of the beam, which results by virtue of the fact that the applied load is on one side of the fulcrum while the test specimen is connected to the beam on the opposite side of the fulcrum.
    Type: Grant
    Filed: July 28, 1989
    Date of Patent: May 22, 1990
    Assignee: The United States of America as represented by the United States National Aeronautics and Space Administration
    Inventors: John H. Crews, Jr., James R. Reeder
  • Bearing-bypass material system test
    Patent number: 4718281
    Abstract: A material specimen 12 containing a central hole is bolted (bolt 27) between two bearing guide plates 28 and 29. An applied load control 11 applies an applied load, either tension or compression, to one end of specimen 12 and a bypass load control 13 applies a bypass load to the other end of specimen 12. Both load controls have their control inputs supplied by a single input signal generator 24. The difference between the applied load and the bypass load is transmitted through bolt 27 and plates 28 and 29 to bearing load cells 30 and 31.
    Type: Grant
    Filed: February 12, 1987
    Date of Patent: January 12, 1988
    Assignee: The United States of America as represented by the Administrator, National Aeronautics & Space Administration
    Inventor: John H. Crews, Jr.