Patents by Inventor Giorgio M. Padoan

Giorgio M. Padoan 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).

  • Casting plastic lenses from thermohardening monomer with compensation for polymer expansion and shrinkage
    Patent number: 4497754
    Abstract: Plastic lenses are cast from thermohardening resins using two mating mold halves positioned in a tubular sleeve which is provided with a fluid compensating reservoir that retains excess resin. As the mold is heated to polymerize the resin the monomer first expands in volume and flows into the reservoir, then as the polymerizing resin contracts additional resin flows out of the reservoir into the mold until the gel stage is reached. Polymerization is completed by moving the mold halves towards each other.
    Type: Grant
    Filed: March 5, 1981
    Date of Patent: February 5, 1985
    Assignee: Societa' Italiana Lenti S.I.L.-S.r.l.
    Inventor: Giorgio M. Padoan