Patents by Inventor N. Keith Brown

N. Keith Brown 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).

  • Security guard device for doors
    Patent number: 4822086
    Abstract: A door security guard device having adjustable telescoping elongated members permanently mounted on the door and being spring urged towards the surface of said door for storage when said device is not in use and for assuring a secure locking engagement when said device is in operation.
    Type: Grant
    Filed: June 1, 1987
    Date of Patent: April 18, 1989
    Inventor: N. Keith Brown