Patents by Inventor Herbert L. Schiewe

Herbert L. Schiewe 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).

  • Patent number: 4488621
    Abstract: An emergency elevator which has a guided cage and a cylinder with closed ends. Valves communicate with the interior of the cylinder adjacent its ends. An additional valve communicates with the interior of the cylinder at a location between one end of the cylinder and the associated valve. A piston is slidably disposed in the cylinder and connected to the cage so that the downward movement of the cage is restrained. A counterweight is coupled to the cage and is of a sufficient weight to raise the cage when it is empty. The counterweight is conveniently disposed within the cylinder and can be integral with the piston.
    Type: Grant
    Filed: December 17, 1981
    Date of Patent: December 18, 1984
    Inventor: Herbert L. Schiewe