Patents by Inventor Karl-Erik Berkestad

Karl-Erik Berkestad 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).

  • Heat exchanger for recovery of heat energy from dust-containing waste gases
    Patent number: 4339249
    Abstract: A heat exchanger for recovering the heat energy content in furnace waste gases and for recovering much of the dust entrained therewith includes a hollow duct through which the waste gases pass, and which contains first and second tube bundles arranged one after the other and a dust collection surface therebetween. The heat content in the waste gases is transferred to water passing through the two tube bundles and dust is deposited on the dust collection surface.
    Type: Grant
    Filed: November 27, 1978
    Date of Patent: July 13, 1982
    Assignee: Stal-Laval Apparat AB
    Inventors: Karl-Erik Berkestad, Lennart Danielsson, Erik Henriksson, Torsten Svensson, Artur stlund
  • Heat exchange with separately supported and separately removable tubular coils
    Patent number: 4230177
    Abstract: The spaced apart elongated supporting members for the various tubular coils of a heat exchanger include vertically spaced apart openings in a wall portion thereof which faces an associated supporting member, the tubular coil being fitted to extend through the openings and thus be supported by the supporting members. A pair of such members, together with the supported tubular coil, comprise a heat exchange section, the entire heat exchanger including a multiplicity of such sections. Each individual section can be separately disconnected and removed from the heat exchanger if a leak develops in the supported tubular coil in a fast and efficient manner.
    Type: Grant
    Filed: November 13, 1978
    Date of Patent: October 28, 1980
    Assignee: Stal-Laval Apparat AB
    Inventor: Karl-Erik Berkestad
  • Resistance device for a gymnastics apparatus
    Patent number: 3944221
    Abstract: Resistance device for a gymnastics apparatus, comprising an air cylinder and a piston which is movable inside the cylinder. The device is provided with non-return valves in such a manner that, during repeated relative movement of the piston in the cylinder, the air pressure in the device and, thereby, resistance to movement of the piston increases successively.
    Type: Grant
    Filed: March 11, 1974
    Date of Patent: March 16, 1976
    Inventors: Karl-Erik Berkestad, Lars Goran Torgny Borjesson
  • Lifting vehicle having a control member adjustable into three different positions
    Patent number: 3940338
    Abstract: A pallet truck is provided with a tiller and a lift device including a lift jack. This is pumped by means of the tiller. In the upper part of this tiller is pivotally mounted a control lever for controlling the lift device for its functioning in different ways. For this purpose the lever is adjustable into three different positions, two outer ones and a middle one, and is by means of a link rod connected to the lift device. The link rod is spring loaded in such a way that it tends to move the lever from one outer position to the other outer position. One outer position is a pumping position for raising the jack. The other outer position is a release position for lowering the jack; while the middle position is a neutral position.
    Type: Grant
    Filed: March 27, 1975
    Date of Patent: February 24, 1976
    Assignee: Ab Bygg- Och Transportekonomi (BT)
    Inventors: Anders Ivar Bryntse, Karl-Erik Berkestad