Patents by Inventor Ulf Ringdahl

Ulf Ringdahl 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: 6045654
    Abstract: The invention relates to a method for fastening a barrier layer to an adjacent laminate layer in a package material. The fastening is performed by a partial adhesive being achieved in a first step and is completed by means of heat treatment in a subsequent step.
    Type: Grant
    Filed: April 27, 1998
    Date of Patent: April 4, 2000
    Assignee: Tetra Laval Holdings & Finance S.A.
    Inventors: Tom Kjelgaard, Ulf Ringdahl, Katarina Magnusson
  • Patent number: 5958486
    Abstract: A method for heat preservation of a container filled with material is accomplished by means of heating and a pressure which is maintained during the holding time of the preservation process. The container of a material of laminate type is, after the holding time of the heat preservation, subjected to a supporting pressure during the cooling time of the process. A container intended to contain goods for heat preservation by means of heating and pressure comprises a base layer (1), an inner layer (3), and a barrier layer (4) between the base layer and the inner layer, and at least one layer consists of a plastic with memory.
    Type: Grant
    Filed: May 1, 1998
    Date of Patent: September 28, 1999
    Assignee: Tetra LAval Holdings & Finance S.A.
    Inventors: Ulf Ringdahl, Majlis Parsson
  • Patent number: 4874021
    Abstract: For the manufacture of packing containers, and the packing inside such containers of long-lasting fluid products, such as liquids, semi-liquids or products containing solid particles, the product delivering and metering devices are an integral part of the packing machine. They condition and influence the structure and the operation thereof. An aseptic-filling unit according to the present invention is a modular element interposed between the packing machine and the product feeding line, and can be isolated from both of them.
    Type: Grant
    Filed: June 8, 1988
    Date of Patent: October 17, 1989
    Assignee: Tetra Dev-Co.
    Inventors: Ulf Ringdahl, Vittorio Mattei