Patents Assigned to Portocork Internacional, S.A.
  • Method of manufacturing a stopper
    Patent number: 6216898
    Abstract: A process of manufacturing a stopper comprises impregnating a cork body with an elastomeric substance such as a silicone rubber mixture. The cork is submerged in the mixture and a vacuum is applied to enhance penetration of the mixture into the cork. The cork is then cleaned by forcing it through a conduit to remove excess liquid, and cured. A thin coating, approximately 25 &mgr;m thick, of the rubber remains on the outer surface of the cork, so that its appearance and feel are not substantially different from that of an untreated cork.
    Type: Grant
    Filed: November 7, 1996
    Date of Patent: April 17, 2001
    Assignee: Portocork Internacional, S.A.
    Inventors: Christopher David Aberdein, Herbert Dressing