Patents by Inventor Frederick Dale Greenfield

Frederick Dale Greenfield 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).

  • Porthole arrangement
    Patent number: 4112645
    Abstract: An improved porthole arrangement provided with a plurality of water drain holes to drain rain water or spray which may accumulate in the porthole arrangement and the porthole arrangement is also provided with a rain shield which allows the window of the porthole to be maintained in an open position for ventilation purposes and prevents the splashing of water into the interior.
    Type: Grant
    Filed: March 16, 1977
    Date of Patent: September 12, 1978
    Inventor: Frederick Dale Greenfield