Patents by Inventor Leif Hakman

Leif Hakman 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).

  • Cellulose based electrically insulating material
    Patent number: 10937562
    Abstract: An electrical device including a cellulose based electrically insulating composite material in the form of a paper or pressboard, the composite material having cellulose fibres; and an electrically insulating thermoplastic polymer material; wherein the polymer material is arranged around and between the cellulose fibres, and binds the fibres to each other.
    Type: Grant
    Filed: July 21, 2014
    Date of Patent: March 2, 2021
    Assignee: ABB Power Grids Switzerland AG
    Inventors: Leif Hakman, Torbjorn Brattberg, Anna Wahlberg, Lars Schmidt
  • Cellulose Based Electrically Insulating Material
    Publication number: 20140327504
    Abstract: An electrical device including a cellulose based electrically insulating composite material in the form of a paper or pressboard, the composite material having cellulose fibres; and an electrically insulating thermoplastic polymer material; wherein the polymer material is arranged around and between the cellulose fibres, and binds the fibres to each other.
    Type: Application
    Filed: July 21, 2014
    Publication date: November 6, 2014
    Inventors: Leif Hakman, Torbjorn Brattberg, Anna Wahlberg, Lars Schmidt