Patents by Inventor Harald S. Wenander

Harald S. Wenander 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).

  • Vacuum treatment unit
    Patent number: 4266581
    Abstract: A vacuum treatment unit for removing excess water from newly poured concrete. The unit comprises a vacuum pump connectable to at least two suction mats or the like via separate suction pipes. So that the pump will always obtain sufficient cooling, the suction pipes are readily disconnectably connected to the suction mats and said pipes are connected at their other ends to the vacuum pump via a settable valve device so constructed that at least one of the pipes is always connected to the suction side of the pump.
    Type: Grant
    Filed: September 19, 1979
    Date of Patent: May 12, 1981
    Assignee: Tremix AB
    Inventor: Harald S. Wenander
  • Apparatus for vacuum processing of concrete
    Patent number: 4203714
    Abstract: This invention relates to apparatus for vacuum processing concrete for removing surplus water from the concrete by exposing the concrete to vacuum. According to the invention solid particles are prevented from being sucked away from the concrete by applying the vacuum to the concrete surface through a sheet perforated with a great number of holes. The holes are sized to substantially exceed the smallest particles to be prevented from being sucked away by filtering within the concrete.
    Type: Grant
    Filed: May 24, 1976
    Date of Patent: May 20, 1980
    Assignee: Tremix AB
    Inventor: Harald S. Wenander