Patents by Inventor Daniel P. Henkel

Daniel P. Henkel 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).

  • Remote and powerless miniature fatigue monitor and method
    Patent number: 5531123
    Abstract: A method and passive monitor for measurement of fatigue is provided. The method includes locating regions of high stress on a structure or material to be monitored, identifying the direction of principal stresses, and then aligning and bonding a specially fabricated passive fatigue monitor to the structure. After the structure has been subjected to a stress cycle, the passive fatigue monitor is removed and the striations formed in the monitor are evaluated. If necessary, contrast enhancement of striations can be performed prior to striation evaluation. Data from evaluations is assessed using rain flow cycle counting and Miners cumulative damage algorithms. The passive fatigue monitor is a small coupon of material fabricated from aluminum or other material known to form well-defined striations. The monitor is specially modified to contain a precrack which provides the location for striation formation.
    Type: Grant
    Filed: November 4, 1994
    Date of Patent: July 2, 1996
    Inventor: Daniel P. Henkel
  • Electrical outlet cover plate and closure therefor
    Patent number: D273084
    Type: Grant
    Filed: October 1, 1981
    Date of Patent: March 20, 1984
    Assignee: Square D Company
    Inventor: Daniel P. Henkel
  • Electrical outlet cover plate enclosure therefor
    Patent number: D283007
    Type: Grant
    Filed: November 3, 1983
    Date of Patent: March 18, 1986
    Assignee: Square D Company
    Inventor: Daniel P. Henkel