Patents by Inventor Piero Gualdi

Piero Gualdi 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).

  • Hand sprayer for liquids
    Patent number: 4220285
    Abstract: Disclosed herein is a hand operated sprayer for liquids, in which the spraying unit is provided with a small bore which is factory sealed at the assembly by a special fitting properly located, to be eliminated by the pumping lever when first operated, said bore communicating with the inner space of the container.
    Type: Grant
    Filed: October 17, 1977
    Date of Patent: September 2, 1980
    Assignee: Spray Plast S.r.1
    Inventor: Piero Gualdi