Patents by Inventor Paul Archibald Aitchison

Paul Archibald Aitchison 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).

  • Normally open reverse flow flapper valve
    Patent number: 7114519
    Abstract: A fluid flow actuated valve for controlling the fluid flow in a conduit comprises a support structure adapted to be mounted within the conduit and at least one flap member pivotally mounted to the support structure. The at least one flap member is pivotable between an first position for a minimum fluid flow and a second position for a maximum fluid flow. A torsion spring is attached to the at least one flap member to urge the same to pivot against a fluid pressure differential, from the first position to the second position when the fluid pressure differential is smaller than a predetermined level.
    Type: Grant
    Filed: December 17, 2004
    Date of Patent: October 3, 2006
    Assignee: Pratt & Whitney Canada Corp.
    Inventors: Paul Archibald Aitchison, Patrick David Germain, Henry Smith
  • Normally open reverse flow flapper valve
    Patent number: 6851255
    Abstract: A fluid flow actuated valve for controlling the fluid flow in a conduit comprises a support structure adapted to be mounted within the conduit and at least one flap member pivotally mounted to the support structure. The at least one flap member is pivotable between an first position for a minimum fluid flow and a second position for a maximum fluid flow. A torsion spring is attached to the at least one flap member to urge the same to pivot against a fluid pressure differential, from the first position to the second position when the fluid pressure differential is smaller than a predetermined level.
    Type: Grant
    Filed: December 18, 2002
    Date of Patent: February 8, 2005
    Assignee: Pratt & Whitney Canada Corp.
    Inventors: Paul Archibald Aitchison, Patrick David Germain, Henry Smith
  • Normally open reverse flow flapper valve
    Publication number: 20040118105
    Abstract: A fluid flow actuated valve for controlling the fluid flow in a conduit comprises a support structure adapted to be mounted within the conduit and at least one flap member pivotally mounted to the support structure. The at least one flap member is pivotable between an first position for a minimum fluid flow and a second position for a maximum fluid flow. A torsion spring is attached to the at least one flap member to urge the same to pivot against a fluid pressure differential, from the first position to the second position when the fluid pressure differential is smaller than a predetermined level.
    Type: Application
    Filed: December 18, 2002
    Publication date: June 24, 2004
    Applicant: Pratt & Whitney Canada Corp.
    Inventors: Paul Archibald Aitchison, Patrick David Germain, Henry Smith