Patents by Inventor John A. Duff

John A. Duff 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).

  • Powered exhaust apparatus for a personal protection respiratory device
    Patent number: 12138491
    Abstract: An exhaust apparatus for connection to a personal protection respiratory device that defines a filtered air volume adjacent to the face of a wearer and comprises at least one exhalation, the apparatus comprising a blower in fluid connection with the at least one exhalation valve, the blower being responsive to the wearer's respiratory cycle to draw a substantial portion of the wearer's exhaled breath through the at least one exhalation valve wherein, in response to the wearer's respiratory cycle, the blower operates throughout the wearer's exhale breath, or a substantial period thereof, and does not operate throughout the wearer's inhale breath, or a substantial period thereof
    Type: Grant
    Filed: February 18, 2022
    Date of Patent: November 12, 2024
    Assignee: 3M Innovative Properties Company
    Inventors: Desmon T. Curran, John A. Duff, Benjamin H. Cooper, Jason A. Graves, Reyad A. Abdulqader
  • Powered apparatus for a personal protection respiratory device
    Patent number: 11554233
    Abstract: There is provided an exhaust apparatus for connection to a personal protection respiratory device that defines a filtered air volume adjacent to the face of a wearer and comprises at least one exhalation, the apparatus comprising a blower in fluid connection with the at least one exhalation valve, the blower being responsive to the wearer's respiratory cycle to draw a substantial portion of the wearer's exhaled breath through the at least one exhalation valve wherein, in response to the wearer's respiratory cycle, the blower operates throughout the wearer's exhale breath, or a substantial period thereof, and does not operate throughout the wearer's inhale breath, or a substantial period thereof.
    Type: Grant
    Filed: January 11, 2018
    Date of Patent: January 17, 2023
    Assignee: 3M Innovative Properties Company
    Inventors: John A. Duff, Benjamin H. Cooper, Jason A. Graves, Henning T. Urban
  • POWERED EXHAUST APPARATUS FOR A PERSONAL PROTECTION RESPIRATORY DEVICE
    Publication number: 20220168597
    Abstract: An exhaust apparatus for connection to a personal protection respiratory device that defines a filtered air volume adjacent to the face of a wearer and comprises at least one exhalation, the apparatus comprising a blower in fluid connection with the at least one exhalation valve, the blower being responsive to the wearer's respiratory cycle to draw a substantial portion of the wearer's exhaled breath through the at least one exhalation valve wherein, in response to the wearer's respiratory cycle, the blower operates throughout the wearer's exhale breath, or a substantial period thereof, and does not operate throughout the wearer's inhale breath, or a substantial period thereof
    Type: Application
    Filed: February 18, 2022
    Publication date: June 2, 2022
    Inventors: Desmon T. Curran, John A. Duff, Benjamin H. Cooper, Jason A. Graves, Reyad A. Abdulqader
  • Powered Apparatus for a Personal Protection Respiratory Device
    Publication number: 20200038614
    Abstract: There is provided an exhaust apparatus for connection to a personal protection respiratory device that defines a filtered air volume adjacent to the face of a wearer and comprises at least one exhalation, the apparatus comprising a blower in fluid connection with the at least one exhalation valve, the blower being responsive to the wearer's respiratory cycle to draw a substantial portion of the wearer's exhaled breath through the at least one exhalation valve wherein, in response to the wearer's respiratory cycle, the blower operates throughout the wearer's exhale breath, or a substantial period thereof, and does not operate throughout the wearer's inhale breath, or a substantial period thereof.
    Type: Application
    Filed: January 11, 2018
    Publication date: February 6, 2020
    Inventors: John A. Duff, Benjamin H. Cooper, Jason A. Graves, Henning T. Urban
  • Powered Exhaust Apparatus For A Personal Protection Respiratory Device
    Publication number: 20180185677
    Abstract: An exhaust apparatus for connection to a personal protection respiratory device that defines a filtered air volume adjacent to the face of a wearer and comprises at least one exhalation, the apparatus comprising a blower in fluid connection with the at least one exhalation valve, the blower being responsive to the wearer's respiratory cycle to draw a substantial portion of the wearer's exhaled breath through the at least one exhalation valve wherein, in response to the wearer's respiratory cycle, the blower operates throughout the wearer's exhale breath, or a substantial period thereof, and does not operate throughout the wearer's inhale breath, or a substantial period thereof.
    Type: Application
    Filed: June 28, 2016
    Publication date: July 5, 2018
    Inventors: Desmon T. Curran, John A. Duff, Benjamin H. Cooper, Jason A. Graves, Reyad A. Abdulqader