Patents by Inventor David P. Knivsland

David P. Knivsland 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).

  • Publication number: 20230321465
    Abstract: A respiratory protection composite facepiece is disclosed and includes a polymeric rigid facepiece body portion having a first surface and a second surface and a silicone sealing facepiece element chemically bonded at least one of the first surface or the second surface. The first and second surfaces can be opposing major surfaces. A second silicone element is chemically bonded to at least one of the first surface or the second surface. Methods of making the same are also disclosed.
    Type: Application
    Filed: June 2, 2023
    Publication date: October 12, 2023
    Inventors: Paul J. Flannigan, Johannes Hoogenraad, David P. Knivsland
  • Patent number: 11701528
    Abstract: A respiratory protection composite facepiece is disclosed and includes a polymeric rigid facepiece body portion having a first surface and a second surface and a silicone sealing facepiece element chemically bonded at least one of the first surface or the second surface. The first and second surfaces can be opposing major surfaces. A second silicone element is chemically bonded to at least one of the first surface or the second surface. Methods of making the same are also disclosed.
    Type: Grant
    Filed: August 1, 2018
    Date of Patent: July 18, 2023
    Assignee: 3M Innovative Properties Company
    Inventors: Paul J. Flannigan, Johannes Hoogenraad, David P. Knivsland
  • Publication number: 20180339178
    Abstract: A respiratory protection composite facepiece is disclosed and includes a polymeric rigid facepiece body portion having a first surface and a second surface and a silicone sealing facepiece element chemically bonded at least one of the first surface or the second surface. The first and second surfaces can be opposing major surfaces. A second silicone element is chemically bonded to at least one of the first surface or the second surface. Methods of making the same are also disclosed.
    Type: Application
    Filed: August 1, 2018
    Publication date: November 29, 2018
    Inventors: Paul J. Flannigan, Johannes Hoogenraad, David P. Knivsland
  • Patent number: 10065056
    Abstract: A respiratory protection composite facepiece is disclosed and includes a polymeric rigid facepiece body portion having a first surface and a second surface and a silicone sealing facepiece element chemically bonded at least one of the first surface or the second surface. The first and second surfaces can be opposing major surfaces. A second silicone element is chemically bonded to at least one of the first surface or the second surface. Methods of making the same are also disclosed.
    Type: Grant
    Filed: December 17, 2014
    Date of Patent: September 4, 2018
    Assignee: 3M Innovative Properties Company
    Inventors: Paul J. Flannigan, Johannes Hoogenraad, David P. Knivsland
  • Publication number: 20150128936
    Abstract: A respiratory protection composite facepiece is disclosed and includes a polymeric rigid facepiece body portion having a first surface and a second surface and a silicone sealing facepiece element chemically bonded at least one of the first surface or the second surface. The first and second surfaces can be opposing major surfaces. A second silicone element is chemically bonded to at least one of the first surface or the second surface. Methods of making the same are also disclosed.
    Type: Application
    Filed: December 17, 2014
    Publication date: May 14, 2015
    Inventors: Paul J. Flannigan, Johannes Hoogenraad, David P. Knivsland
  • Patent number: 8820326
    Abstract: A respiratory protection composite facepiece includes a polymeric rigid facepiece body having a first surface and a second surface, and a silicone sealing facepiece element chemically bonded to at least one of the first surface and the second surface. Methods of forming a respiratory protection composite facepiece are also disclosed.
    Type: Grant
    Filed: July 23, 2008
    Date of Patent: September 2, 2014
    Assignee: 3M Innovative Properties Company
    Inventors: Paul J. Flannigan, Johannes Hoogenraad, David P. Knivsland
  • Publication number: 20100218761
    Abstract: A respiratory protection composite facepiece is disclosed and includes a polymeric rigid facepiece body portion having a first surface and a second surface and a silicone sealing facepiece element chemically bonded at least one of the first surface or the second surface. The first and second surfaces can be opposing major surfaces. A second silicone element is chemically bonded to at least one of the first surface or the second surface. Methods of making the same are also disclosed.
    Type: Application
    Filed: July 15, 2008
    Publication date: September 2, 2010
    Applicant: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: Paul J. Flannigan, Jahannes Hoogenraad, David P. Knivsland
  • Publication number: 20100206311
    Abstract: A respiratory protection composite facepiece includes a polymeric rigid facepiece body having a first surface and a second surface, and a silicone sealing facepiece element chemically bonded to at least one of the first surface and the second surface. Methods of forming a respiratory protection composite facepiece are also disclosed.
    Type: Application
    Filed: July 23, 2008
    Publication date: August 19, 2010
    Inventors: Paul J. Flannigan, Johannes Hoogenraad, David P. Knivsland
  • Patent number: 5924420
    Abstract: A full face respirator mask (10) includes a face shield portion (12) with the seal (20) surrounding a lens portion (14). Inhalation ports (16) and an exhalation port (18) are formed at the lower portion of the lens (14). A center adapter (30) includes a nose cup (40) and an exhalation valve (38) in the center orifice (18). The inhalation ports (16,116) are placed at each side of the exhalation port (18) and include connector portions (50,150) formed with the lens (14) or ultrasonically welded to the lens (14). The connector portions (50) include male connectors (58) in a first embodiment and female connectors (150) in a second embodiment receiving complementary formed connectors of a breathable air source.
    Type: Grant
    Filed: September 24, 1996
    Date of Patent: July 20, 1999
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Joseph G. Reischel, Vaughn B. Grannis, David P. Knivsland
  • Patent number: D378610
    Type: Grant
    Filed: October 27, 1995
    Date of Patent: March 25, 1997
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Joseph G. Reischel, David P. Knivsland, Gerald M. Brostrom, David C. Byram, Vaughn B. Grannis
  • Patent number: D388872
    Type: Grant
    Filed: September 24, 1996
    Date of Patent: January 6, 1998
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Vaughn B. Grannis, David P. Knivsland, Joseph G. Reischel, Gerald M. Brostrom, David C. Byram
  • Patent number: D409744
    Type: Grant
    Filed: March 5, 1997
    Date of Patent: May 11, 1999
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Vaughn B. Grannis, David P. Knivsland, Joseph G. Reischel, Gerald M. Brostrom, David C. Byram
  • Patent number: D421118
    Type: Grant
    Filed: July 20, 1998
    Date of Patent: February 22, 2000
    Assignee: 3M Innovative Properties Company
    Inventors: Joseph G. Reischel, Frank J. Fabin, Michael J. Bartholomew, David P. Knivsland
  • Patent number: D421301
    Type: Grant
    Filed: July 20, 1998
    Date of Patent: February 29, 2000
    Assignee: 3M Innovative Properties Company
    Inventors: Joseph G. Reischel, Michael J. Bartholomew, David P. Knivsland
  • Patent number: D426298
    Type: Grant
    Filed: July 20, 1998
    Date of Patent: June 6, 2000
    Assignee: 3M Innovative Properties Company
    Inventors: Vaughn B. Grannis, David P. Knivsland, Joseph G. Reischel, Gerald M. Brostrom, David C. Byram