Patents by Inventor Dennis D. Hayes

Dennis D. Hayes 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).

  • Self-testing mechanism determining X-ray exposure
    Patent number: 5282236
    Abstract: A mechanism/device (29) in association with a radiographic cassette (20) in which X-ray film (28) or the like is exposed. Upon exposure, an LED (39) continually blinks, indicating exposure to the user, thereby obviating double exposure of the film. A test and reset circuit (80) informs the user at any time of the operational status of device (29). Device (29) comprises a sensor (30), a photodiode (47), a conduit formed by a bundle (31) of optical fibers which conveys light energy from sensor (30) to photodiode (47) that converts it into an electrical current controlled by an electronic circuit (35) which includes LED (39). Circuit (35) includes a detecting and amplifying circuit (51), an oscillating circuit (68), a latching circuit (65) for maintaining blinking of LED (39), and the test-and-reset circuit (80).
    Type: Grant
    Filed: April 7, 1992
    Date of Patent: January 25, 1994
    Inventors: Dennis D. Hayes, Warren W. Welcome
  • X-Ray film cassette holder for use with children
    Patent number: D282872
    Type: Grant
    Filed: September 22, 1983
    Date of Patent: March 4, 1986
    Inventors: Dennis D. Hayes, Dean D. Hayes