Patents by Inventor Kristina Magnusson

Kristina Magnusson 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).

  • Welding helmet having a filter arrangement
    Patent number: 10667952
    Abstract: A welding helmet (100, 200, 300, 400, 500) having a filter arrangement is disclosed. The welding helmet is provided with a main filter (102, 202, 302, 402, 502) and at least one auxiliary filter (104, 204, 304, 404, 504) separate from and positioned next to the main filter. The at least one auxiliary filter comprises an electro-optic element (10, 20) adapted to attenuate the transmission of optical radiation incident on the auxiliary filter.
    Type: Grant
    Filed: November 28, 2011
    Date of Patent: June 2, 2020
    Assignee: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: Kristina Magnusson, Kenneth Jarefors
  • WELDING HELMET HAVING A FILTER ARRANGEMENT
    Publication number: 20140013479
    Abstract: A welding helmet (100, 200, 300, 400, 500) having a filter arrangment is disclosed. The welding helmet is provided with a main filter (102, 202, 302, 402, 502) and at least one auxiliary filter (104, 204, 304, 404, 504) separate from and positioned next to the main filter. The at least one auxiliary filter comprises an electro-optic element (10, 20) adapted to attenuate the transmission of optical radiation incident on the auxiliary filter.
    Type: Application
    Filed: November 28, 2011
    Publication date: January 16, 2014
    Applicant: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: Kristina Magnusson, Kenneth Jarefors
  • Automatic darkening filter with offset polarizers
    Publication number: 20060203148
    Abstract: A protective automatic darkening filter construction 10 includes two low twist liquid crystal cells 26, 30 interspersed between a series of offset polarizers 24, 28, 32. The resulting construction provides improved homogeneity in the dark state as viewed by the user over a large viewing angle. By reducing variations in shade, visibility through the filter may be improved.
    Type: Application
    Filed: March 9, 2005
    Publication date: September 14, 2006
    Inventors: Kristina Magnusson, Kenneth Jarefors, Per-Olav Dahlin