Patents by Inventor Thomas W. Holmquist-Brown

Thomas W. Holmquist-Brown 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).

  • FILTER CARTRIDGE HAVING CONE OF VISIBILITY FOR END-OF-SERVICE-LIFE-INDICATOR (ESLI)
    Publication number: 20100294274
    Abstract: A filter cartridge 12 that includes a filter material 42, an end-of-service-life-indicator 40, a cartridge housing 22, and a window 38. The filter material 42 and ESLI 40 are disposed in the housing, and the ESLI 40 may be viewed through the window 38. The window 38 is configured such that the ESLI 40 can only be seen within a cone defined by an angle ? of 20 to 70 degrees. The limited viewing range precludes reader error when examining the ESLI for color change.
    Type: Application
    Filed: May 22, 2009
    Publication date: November 25, 2010
    Inventors: Richard J. Poirier, Thomas W. Holmquist-Brown, Neal A. Rakow
  • Respirator and filter cartridge
    Patent number: 6277178
    Abstract: A respirator (10) includes a filter cartridge (12) that has a housing (16) and a bonded sorbent filter element (20). Housing (16) includes a sleeve (32) that has an inner surface (36) and a folded edge (42). The filter element (18) includes a bonded sorbent filter element (20) that is pressed against the sleeve's inner surface (36) and that is held in the sleeve (32) by the folded edge (42).
    Type: Grant
    Filed: January 20, 1995
    Date of Patent: August 21, 2001
    Assignee: 3M Innovative Properties Company
    Inventors: Thomas W. Holmquist-Brown, Peter O. Rekow
  • Respirator having a compressible press fit filter element
    Publication number: 20010013347
    Abstract: A respirator 10 includes a compressible filter element 12, a filter element retainer 14, and a face piece 16. The respirator is unique in that the filter element 12 compresses when installed in the retainer 14, allowing a friction fit to be maintained between the filter element 12 and retainer 14. The friction fit enables the filter element 12 to be readily replaced when its service life has expired.
    Type: Application
    Filed: January 31, 2001
    Publication date: August 16, 2001
    Applicant: 3M Innovative Properties Company
    Inventors: Peter O. Rekow, Thomas W. Holmquist-Brown, David L. Braun, Vaughn B. Grannis
  • Respirator having a compressible press fir filter element
    Patent number: 6216693
    Abstract: A respirator 10 includes a compressible filter element 12, a filter element retainer 14, and a face piece 16. The respirator is unique in that the filter element 12 compresses when installed in the retainer 14, allowing a friction fit to be maintained between the filter element 12 and retainer 14. The friction fit enables the filter element 12 to be readily replaced when its service life has expired.
    Type: Grant
    Filed: January 20, 1995
    Date of Patent: April 17, 2001
    Assignee: 3M Innovative Properties Company
    Inventors: Peter O. Rekow, Thomas W. Holmquist-Brown, David L. Braun, Vaughn B. Grannis
  • Respirator having snap-fit filter cartridge
    Patent number: 5579761
    Abstract: A respirator (10) that includes a face piece (14) and a cartridge receiving structure (22) located on the face piece (14). The face piece (14) is sized to fit snugly over the nose and mouth of a person, and the filter cartridge (12) is capable of being manually snapped into engagement with the cartridge receiving structure (22). The snap-fit can be instantaneously obtained without rotational movement of the filter cartridge (12), simply by pressing the filter cartridge (12) against the receiving structure (22).
    Type: Grant
    Filed: January 20, 1995
    Date of Patent: December 3, 1996
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Gregory Yuschak, Peter O. Rekow, Thomas W. Holmquist-Brown
  • Respirator having snap-fit filter cartridge
    Patent number: RE39493
    Abstract: A respirator (10) that includes a face piece (14) and a cartridge receiving structure (22) located on the face piece (14). The face piece (14) is sized to fit snugly over the nose and mouth of a person, and the filter cartridge (12) is capable of being manually snapped into engagement with the cartridge receiving structure (22). The snap-fit can be instantaneously obtained without rotational movement of the filter cartridge (12), simply by pressing the filter cartridge (12) against the receiving structure (22).
    Type: Grant
    Filed: February 25, 1998
    Date of Patent: February 27, 2007
    Assignee: 3M Innovative Properties Company
    Inventors: Gregory Yuschak, Peter O. Rekow, Thomas W. Holmquist-Brown
  • Filter cartridge inlet grill pattern
    Patent number: D555777
    Type: Grant
    Filed: August 28, 2006
    Date of Patent: November 20, 2007
    Assignee: 3M Innovative Properties Company
    Inventors: Jason L. Aveldson, Thomas W. Holmquist-Brown, Jeffrey A. Eyberg
  • Strap carriers on a respirator
    Patent number: D568986
    Type: Grant
    Filed: July 31, 2007
    Date of Patent: May 13, 2008
    Assignee: 3M Innovative Properties Company
    Inventors: Thomas W. Holmquist-Brown, John M. Pilgrim, James R. Betz, Sean M. Burke, Alan J. Solyntjes, Paul A. Martinson, David M. Castiglione
  • Respirator mask body
    Patent number: D613850
    Type: Grant
    Filed: July 31, 2007
    Date of Patent: April 13, 2010
    Assignee: 3M Innovative Properties Company
    Inventors: Thomas W. Holmquist-Brown, John M. Pilgrim, Thomas G. Skulley
  • Filter housing
    Patent number: D613851
    Type: Grant
    Filed: August 21, 2007
    Date of Patent: April 13, 2010
    Assignee: 3M Innovative Properties Company
    Inventors: John M. Pilgrim, Thomas W. Holmquist-Brown