Patents by Inventor Martin M. Stone

Martin M. Stone 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).

  • Squirrel-proof bird feeder
    Patent number: 6584933
    Abstract: A squirrel-proof attachment comprises detachable spaced collars that are mounted on a tubular bird feeder. An electrical source, attached to the base of the bird feeder, is powered by solar cells and battery backup and provides voltage that is fed into copper wire loops that are built into the collars.
    Type: Grant
    Filed: November 29, 2001
    Date of Patent: July 1, 2003
    Inventor: Martin M. Stone