Patents by Inventor Do Khacdung

Do Khacdung 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 welding mask
    Patent number: 4916753
    Abstract: A safety welding mask is set forth provided with a self-contained battery power supply and associated switching for opening and closing of a safety window associated with the welding mask.
    Type: Grant
    Filed: December 12, 1988
    Date of Patent: April 17, 1990
    Inventor: Do Khacdung