Patents by Inventor Henry W. Praml

Henry W. Praml 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).

  • System including household connector plug for split wire receptacle
    Patent number: 4019797
    Abstract: This relates to an electrical connecting device or plug, preferably of the U-grounded type, which when plugged into a standard split wire duplex receptacle will double the voltage potential available at the receptacle. A modified form of the invention comprises an electrical connecting device or plug which when plugged into a standard split wire duplex receptacle will provide an option of either doubling the voltage potential available at the receptacle or, alternatively, operating as a single plug for a pair of appliances, each at normal household voltage.
    Type: Grant
    Filed: November 17, 1975
    Date of Patent: April 26, 1977
    Inventor: Henry W. Praml