Patents by Inventor Darrell N. Johnston

Darrell N. Johnston 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).

  • Detonator with cushioned mallet
    Patent number: 7598445
    Abstract: A cantilever spring carrying a mallet with a low friction tip.
    Type: Grant
    Filed: September 15, 2008
    Date of Patent: October 6, 2009
    Inventor: Darrell N. Johnston
  • Bass drum foot pedal
    Patent number: 5301592
    Abstract: An improved bass drum foot pedal having a variable drive lever linkage with variable arc ratios connecting the foot pedal to the beater arm and having an electronic device actuator carried by a beater support member and adjustable to vary the impact force and strike point of the actuator, said actuator being operable with or without said pedal being attached to a drum.
    Type: Grant
    Filed: June 14, 1991
    Date of Patent: April 12, 1994
    Inventor: Darrell N. Johnston