Patents by Inventor Harri Hakasalo

Harri Hakasalo 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).

  • Device and method for mixing peat and sludge
    Patent number: 5494351
    Abstract: A method and mixer for mixing peat and sludge into a homogenous mass, in which method the peat and sludge is mixed by pressurizing the pre-mixed mass for some time, when the sludge is absorbed by and bound in the peat. The mixer in accordance with the invention includes a silo (1) and a screw conveyor (4) located beneath it, from which the mass is squeezed out through a nozzle (10).
    Type: Grant
    Filed: March 20, 1995
    Date of Patent: February 27, 1996
    Assignee: Vapo Oy
    Inventor: Harri Hakasalo