Patents by Inventor Lennart Wahlstrom

Lennart Wahlstrom 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: 5165801
    Abstract: A package is disclosed comprising two members formed together. One of the members is a closed member of cardboard or a corresponding material, and the other member is flexible. The rigidifying member has a closed peripheral portion, and a completely covering bottom which is continuous with the peripheral portion. The flexible member is fastened along its entire periphery at sufficient points on the outer member such that the package has a stable shape.
    Type: Grant
    Filed: October 28, 1991
    Date of Patent: November 24, 1992
    Assignee: AB Akerlund & Rausing
    Inventors: Lennart A. Stenstrom, Lennart Wahlstrom
  • Patent number: 5096306
    Abstract: A package is disclosed comprising two members formed together. One of the members is a closed member of cardboard or a corresponding material, and the other member is flexible. The rigidifying member has a closed peripheral portion, and a completely covering bottom which is continuous with the peripheral portion. The flexible member is fastened along its entire periphery at sufficient points on the outer member such that the package has a stable shape.
    Type: Grant
    Filed: September 5, 1989
    Date of Patent: March 17, 1992
    Assignee: Tetra Pak AB
    Inventors: Bengt Perrson, Lennart A. Stenstrom, Lennart Wahlstrom
  • Patent number: 4816231
    Abstract: A cassette to be used in a conveyor device for products, for instance food stuff. The cassette (18) comprises a thin, broad-sided and broken through casing of substantially uniform thickness having an openable cover of broken through type. The casing and cover are interconnected along one side of the cover in several joints (47) and are interconnectable at several locking locations (48) along an opposite side of the cassette such that the casing and cassette in spite of the broken through structure, form a rigid and strong unit when the cover is closed.
    Type: Grant
    Filed: October 17, 1986
    Date of Patent: March 28, 1989
    Assignee: Alfastar AB
    Inventors: Lennart Stenstrom, Lennart Wahlstrom, Bjorn Lindstrom
  • Patent number: 4735172
    Abstract: A milking means comprising a number of teat cups, each having necessary connections for the milking function. According to the invention the milking means has such a design that when the milking means is in the position for application of the teat cups (11; 21; 31; 40; 50) onto the teats of the animal, each teat cup freely from the remaining teat cups is hanging down from a point (13; 25; 32; 45; 54) above the teat base (14; 26; 33; 46; 55) of the udder of the animal.
    Type: Grant
    Filed: September 18, 1985
    Date of Patent: April 5, 1988
    Assignee: Alfa-Laval Agri International AB
    Inventors: Lennart Wahlstrom, Michael Mayntz
  • Patent number: 4734004
    Abstract: A sluice device for insertion between zones having different environmental conditions, for instance pressure and/or temperature. A drum is rotatably arranged in an opening in a housing and has radially displaceable flaps uniformly distributed along the periphery of the drum. Each flap has a first portion for sealing against the housing, and a second portion of the flap, adjacent to the drum, cooperates with a sealing device. The sluice device is formed as a longitudinal groove which is open against the drum, whereby a longitudinal sealing member is arranged in the groove. The pressure difference between spaces at the two sides of the flap brings the longitudinal sealing member in such a sealing position that the flap, by the pressure difference, is placed in sealing abutment against the inside of the housing regardless of the positive or negative pressure difference.
    Type: Grant
    Filed: October 17, 1986
    Date of Patent: March 29, 1988
    Assignee: Alfastar AB
    Inventors: Lennart Stenstrom, Lennart Wahlstrom, Torsten Malmgren
  • Patent number: 4356932
    Abstract: An evacuable casing for a rotor machine comprises a cover surrounding the machine, bearing means mounting the cover for rotation on a foundation, the cover having an endless base edge, and sealing means extending along the base edge to seal against the foundation when a vacuum is applied within the cover. One part of the cover is mounted for movement relative to a second part of the cover to form a large opening in the cover, this opening in combination with said rotation of the cover on the foundation providing easy access to the machine from any radial direction.
    Type: Grant
    Filed: June 22, 1981
    Date of Patent: November 2, 1982
    Assignee: Alfa-Laval AB
    Inventors: Lennart Wahlstrom, Lars K. J. Ehnstrom
  • Patent number: D301822
    Type: Grant
    Filed: August 19, 1985
    Date of Patent: June 27, 1989
    Inventors: Lennart Stenstrom, Lennart Wahlstrom
  • Patent number: D301823
    Type: Grant
    Filed: August 19, 1985
    Date of Patent: June 27, 1989
    Inventors: Lennart Stenstrom, Lennart Wahlstrom