Patents by Inventor William A. Hackman

William A. Hackman 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).

  • Patent number: 4993468
    Abstract: The invention concerns a window and screen system provided at the end thereof that permits a screen to be moved into position upon the opening of the window. One end of the screen is attached to the end wall of the window sash thereby allowing effective sealing when the window is closed as well as the complete hiding of the screen. The screen itself is provided with an elongated seal along each of the marginal edges. As the window opens the screen is retracted from a holding area through a seal and guide channels cooperate with the elongated seal to provide a screen sealed about each of its marginal edges regardless of the degree to which the window is opened.
    Type: Grant
    Filed: July 28, 1989
    Date of Patent: February 19, 1991
    Inventors: William A. Hackman, Leonard A. Miller