Patents by Inventor George I. Duncan

George I. Duncan 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).

  • Protected potted metallized film capacitor
    Patent number: 4791529
    Abstract: A protective system to prevent a dry metallized film capacitor from rupturing its case or catching fire in the event that an internal short or fault occurs within the capacitor section utilizes a fuse and a thermal protector connected in series with the capacitor section and within its case. The fuse serves to protect the unit from a fault-induced low resistance high current in-rush, while the thermal protector is triggered by a fault-induced high resistance low current. A heat reflective circumferential sheet and the positioning of thermal protector maximize its value in the protective system.
    Type: Grant
    Filed: May 1, 1987
    Date of Patent: December 13, 1988
    Assignee: Advance Transformer Company
    Inventors: George I. Duncan, Stephen L. Phelps
  • Protected potted metallized film capacitor
    Patent number: 4714979
    Abstract: A protective system to prevent a dry metallized film capacitor from exploding or catching fire in the event that an internal short or fault occurs within the capacitor section utilizes a fuse and a thermal protector connected in series with the capacitor section and within its case. The fuse serves to protect the unit from a fault-induced low resistance high current in-rush, while the thermal protector is triggered by a fault-induced high resistance low current. A heat reflective circumferential sheet and positioning of thermal protector maximize its value in the protective system.
    Type: Grant
    Filed: December 16, 1986
    Date of Patent: December 22, 1987
    Assignee: Advance Transformer Company
    Inventors: George I. Duncan, Stephen L. Phelps