Patents by Inventor Nils Folke Rydell

Nils Folke Rydell 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).

  • Fluid forming apparatus having controllably variable forming pressure
    Patent number: 3962895
    Abstract: Fluid forming apparatus having a constant-volume pressure cavity has oppositely movable rigid forming tool parts, each connected with a piston comprising a double acting cylinder mechanism. Forming pressure is developed by hydraulically forcing one tool part in the direction that tends to reduce cavity volume, thus, by reaction, forcing the other tool part in the opposite direction against restraint. A cam mechanism moving with said one tool part defines a pressure program. Sensor means, cooperating with the cam and with pressure regulating valve mechanism, controls pressure of the fluid driving said one tool part in accordance with the program and the position of that tool part.
    Type: Grant
    Filed: December 4, 1974
    Date of Patent: June 15, 1976
    Assignee: Saab-Scania Aktiebolag
    Inventor: Nils Folke Rydell