Patents by Inventor Karl G. Ohlson

Karl G. Ohlson 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).

  • Method and apparatus for the batchwise production of paving mixes containing mineral aggregate and bituminous binder
    Patent number: 4793711
    Abstract: In such batchwise production of a paving mix of mineral particles and bituminous binder, in which a coarse-grained portion of the mineral aggregate batch is first introduced in measured quantity into a container and then discharged through a discharge opening in the container, controlled by a discharge door into an asphalt mixer where the coarse-grained portion of the mineral aggregate batch is mixed with a batch of binder, whereupon the remaining, fine-grained portion of the mineral aggregate batch is introduced in measured quantity into the container and then discharged through the discharge opening into the mixer the time needed to discharge the fine-grained portion of the mineral material batch is controlled.
    Type: Grant
    Filed: April 22, 1986
    Date of Patent: December 27, 1988
    Inventor: Karl G. Ohlson
  • Method and apparatus for the production of asphalt concrete
    Patent number: 4579458
    Abstract: In the batchwise production of asphalt concrete only such aggregate is utilized, as comprises a coarse-grained portion, a fine-grained portion and a filler portion. The coarse-grained portion and the bituminous binder used are mixed in a mixer, and the filler portion is added to the mixer in such a way that it is has been taken up by and suspended in the binder film deposited on the coarse-grained portion before the free particles on the fine-grained portion are added. In such a way the thickness of the binder film and the capability thereof to take up the particles of the fine-grained portion are increased so that also said particles are coated with and suspended in the binder.
    Type: Grant
    Filed: March 28, 1983
    Date of Patent: April 1, 1986
    Inventor: Karl G. Ohlson
  • Method and apparatus for the batchwise production of paving mixes containing mineral aggregate and bituminous binder
    Patent number: 4468125
    Abstract: In such batchwise production of a paving mix of mineral particles and bituminous binder, in which a coarse-grained portion of the mineral aggregate batch is first introduced in measured quantity into a container and then discharged through a discharge opening in the container, controlled by a discharge door into an asphalt mixer where the coarse-grained portion of the mineral aggregate batch is mixed with a batch of binder, whereupon the remaining, fine-grained portion of the mineral aggregate batch is introduced in measured quantity into the container and then discharged through the discharge opening into the mixer the time needed to discharge the fine-grained portion of the mineral material batch is controlled.
    Type: Grant
    Filed: July 20, 1981
    Date of Patent: August 28, 1984
    Inventor: Karl G. Ohlson