Patents by Inventor Sherman Jack Pirkle

Sherman Jack Pirkle 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).

  • Defibrillator charging circuit
    Patent number: 4119903
    Abstract: Change in the charge level of a storage capacitor of a defibrillator is accomplished by setting the charge control to the new level and successively closing and opening the charge switch. This actuates the safety relay so as to remove a low impedance shunt from the capacitor and it initiates the charging action. Charging ceases when the preset charge level is reached.
    Type: Grant
    Filed: January 5, 1978
    Date of Patent: October 10, 1978
    Assignee: Hewlett-Packard Company
    Inventor: Sherman Jack Pirkle