Patents Assigned to Richard Friedrich
  • Container with at least one chamber formed by a tubular body, and a tubular body
    Patent number: 5156309
    Abstract: In a double chamber container, the inner chamber is formed by a tubular body in an elastic rubbery material stretched in order to expel a pressurized substance against its own elasticity. To obtain a precise stretching ratio of the hose (1) and to empty it as well as possible, the hose converges uniformly and its walls have a uniform thickness, even in their bottom part (9). To attach the hose (1) to the container, a collar (11) which acts also as a seal is formed on the hose.
    Type: Grant
    Filed: February 6, 1991
    Date of Patent: October 20, 1992
    Assignee: Richard Friedrich
    Inventor: Richard Friedrich