Patents by Inventor Douglas Alan Popwell

Douglas Alan Popwell 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).

  • Safety plug
    Patent number: 6752174
    Abstract: Disclosed herein is a novel drain plug that comprises a body portion, and a recess defined in said body portion. Disposed within the recess is a sealing gasket made of an expandable material.
    Type: Grant
    Filed: January 22, 2003
    Date of Patent: June 22, 2004
    Inventors: Paul Eric Kristofferson, Douglas Alan Popwell
  • SAFETY PLUG
    Publication number: 20040065376
    Abstract: Disclosed herein is a novel drain plug that comprises a body portion, and a recess defined in said body portion. Disposed within the recess is a sealing gasket made of an expandable material.
    Type: Application
    Filed: January 22, 2003
    Publication date: April 8, 2004
    Inventors: Paul Eric Kristofferson, Douglas Alan Popwell