Patents by Inventor Pietro Negroni

Pietro Negroni 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).

  • Automatic refilling plant watering device
    Patent number: 5415347
    Abstract: A container and distributor of water is internally provided with a bath pivoted in such a way as to empty when full. A floating piston situated inside a chamber enables water delivery to the bath at a rate regulated by varying a water head in the chamber, and an outlet opening from the chamber conducts water into the bath. A rod, insertable in the outlet opening and movable upon pivoting of the bath, prevents a build-up of residues in the outlet due to impurities in the water such that the outlet opening does not become blocked or obstructed.
    Type: Grant
    Filed: April 25, 1994
    Date of Patent: May 16, 1995
    Assignee: G.F. S.r.l.
    Inventor: Pietro Negroni