Patents by Inventor Darrell Parr

Darrell Parr 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).

  • Universal electrical plug adapter
    Patent number: 4585286
    Abstract: An electrical adapter converts a three-prong male household plug to a three-prong male OSHA twistlock connector, and vice versa.
    Type: Grant
    Filed: August 5, 1985
    Date of Patent: April 29, 1986
    Inventor: Darrell Parr