Patents by Inventor John A. Boothroyd

John A. Boothroyd 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).

  • Paddle switch safety button
    Patent number: 4276459
    Abstract: A paddle switch safety button which prevents the paddle switch from being activated prior to the safety button being depressed. A unique multi cross section stem of the safety button cooperates with a U-shaped cutout in the paddle switch lever. The stem interferes with the lever in its extended position and passes in the U-shaped notch in the depressed position to allow the paddle switch lever to be operated.
    Type: Grant
    Filed: June 16, 1980
    Date of Patent: June 30, 1981
    Assignee: Ingersoll-Rand Company
    Inventors: Daniel E. Willett, John A. Boothroyd, William F. Langlais