Patents by Inventor Per G. Mellgren

Per G. Mellgren 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: 4445552
    Abstract: This invention is directed to a method and apparatus for continuously harvesting trees to be used ultimately for lumber, pulpwood, and the like. The method comprises moving a tree cutting means through trees standing along the edge of a stand of trees in a continuous manner at a rate whereby the trees along the path taken by the tree cutting means are cut continuously and collected in a substantially parallel pattern on a trough-like means. The apparatus comprises a tree cutting means, means such as a power wagon for moving the cutting means through trees standing along the edge of the stand of trees, framework means for collecting and guiding the cut trees and depositing them in a substantially parallel manner on the trough-like means which is part of or accompanies the cutting means and the tree collecting and guiding means.
    Type: Grant
    Filed: November 27, 1981
    Date of Patent: May 1, 1984
    Assignee: Prince Albert Pulp Company Limited
    Inventors: Bruce Hyde, Wayne Tyndall, Dennis Abernethy, Per G. Mellgren
  • Patent number: 4369035
    Abstract: Particularly uniform and rapid dyeing of textile material is achieved, subsequent to feeding the dyeing liquor into a processing container filled with the textile material and heating the dyeing liquor approximately to boiling temperature, by a gradual lowering of the container pressure by means of a regulating device and/or by supplying the dyeing liquor with heat by means of a temperature regulating arrangement, so that the dyeing liquor will be kept boiling slowly and steadily at partial evaporation, and the rising steam bubbles will agitate the dyeing liquor without requiring induced circulation by means of a pump or similar, and bring the dyeing liquor into intimate contact with the textile material. The dyeing process may be aided by a pulsating motion of the dyeing liquor. In certain instances, all energy required is supplied in the form of steam.
    Type: Grant
    Filed: March 5, 1981
    Date of Patent: January 18, 1983
    Inventors: Fritz Karrer, Alberto Pedretti, Per G. Mellgren