Patents by Inventor Craig McLeod Duff
Craig McLeod 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).
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Patent number: 9763769Abstract: A tubular graft comprising an internal helical formation which imparts helical flow on fluid passing through the tubular graft. One end of the tubular graft is tapered from an inner base to an outer tip.Type: GrantFiled: May 14, 2014Date of Patent: September 19, 2017Assignee: Vascular Flow Technologies LimitedInventors: Robert Gordon Hood, Craig McLeod Duff
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Publication number: 20160368191Abstract: A tubular conduit is disclosed. The tubular conduit comprises a tubular portion made from a flexible material and an axially extending external helical formation located around the outside of the tubular portion. The external helical formation is for supporting the tubular portion. Optionally the tubular portion also comprises an axially extending internal helical protrusion, which imparts a helical flow to a fluid passing through the tubular portion. It is preferred that the tubular conduit is a vascular graft.Type: ApplicationFiled: August 29, 2016Publication date: December 22, 2016Inventors: Robert Gordon Hood, Craig McLeod Duff
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Patent number: 9456891Abstract: A tubular conduit is disclosed. The tubular conduit comprises a tubular portion made from a flexible material and an axially extending external helical formation located around the outside of the tubular portion. The external helical formation is for supporting the tubular portion. Optionally the tubular portion also comprises an axially extending internal helical protrusion, which imparts a helical flow to a fluid passing through the tubular portion. It is preferred that the tubular conduit is a vascular graft.Type: GrantFiled: November 12, 2012Date of Patent: October 4, 2016Assignee: Vascular Flow Technologies LimitedInventors: Robert Gordon Hood, Craig McLeod Duff
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Patent number: 8999472Abstract: A tubular conduit is disclosed. The tubular conduit comprises a tubular portion made from a flexible material and an axially extending external helical formation located around the outside of the tubular portion. The external helical formation is for supporting the tubular portion. Optionally the tubular portion also comprises an axially extending internal helical protrusion, which imparts a helical flow to a fluid passing through the tubular portion. It is preferred that the tubular conduit is a vascular graft.Type: GrantFiled: November 12, 2012Date of Patent: April 7, 2015Assignee: Vascular Flow Technologies LimitedInventors: Robert Gordon Hood, Craig McLeod Duff
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Publication number: 20140303713Abstract: A tubular graft comprising an internal helical formation which imparts helical flow on fluid passing through the tubular graft. One end of the tubular graft is tapered from an inner base to an outer tip.Type: ApplicationFiled: May 14, 2014Publication date: October 9, 2014Applicant: Vascular Flow Technologies LimitedInventors: Robert Gordon Hood, Craig McLeod Duff
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Patent number: 8758426Abstract: A tubular graft comprising an internal helical formation which imparts helical flow on fluid passing through the tubular graft. One end of the tubular graft is tapered from an inner base to an outer tip.Type: GrantFiled: September 5, 2006Date of Patent: June 24, 2014Assignee: Vascular Flow Technologies LimitedInventors: Robert Gordon Hood, Craig McLeod Duff
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Patent number: 8389088Abstract: A tubular conduit (1) is disclosed. The tubular conduit comprises a tubular portion made from a flexible material and an axially extending external helical formation (16) located around the outside of the tubular portion. The external helical formation (16) is for supporting the tubular portion. Optionally the tubular portion also comprises an axially extending internal helical protrusion (15), which imparts a helical flow to a fluid passing through the tubular portion. It is preferred that the tubular conduit (1) is a vascular graft.Type: GrantFiled: March 23, 2005Date of Patent: March 5, 2013Assignee: Tayside Flow Technologies Ltd.Inventors: Robert Gordon Hood, Craig McLeod Duff
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Patent number: 8021415Abstract: There is disclosed an insert (2) for a conduit (4) adapted to effect helical flow in the conduit (4) comprising a longitudinally extending member having a helical formation.Type: GrantFiled: January 17, 2008Date of Patent: September 20, 2011Assignee: Tayside Flow Technologies LimitedInventors: John Graeme Houston, Peter Arno Stonebridge, John Bruce Cameron Dick, Robert Gordon Hood, Allana Johnstone, Christophe Emmanuel Sarran, Craig McLeod Duff
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Patent number: 7968036Abstract: There is disclosed a method for introducing a helical formation (11) into a flexible tubular material (12). The material (12) is supported together with a surrounding helical former (13) so as to deform the material (12) to have a helical indentation (11) corresponding to the shape of the former (13). The material (12) is then set in that configuration and the former (13) is removed.Type: GrantFiled: April 10, 2008Date of Patent: June 28, 2011Assignee: Tayside Flow Technologies LimitedInventors: John Graeme Houston, Peter Arno Stonebridge, John Bruce Cameron Dick, Robert Gordon Hood, Allana Johnstone, Christophe Emmanuel Sarran, Craig McLeod Duff
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Patent number: 7503226Abstract: A method of assessing the effect of a conduit section (11) on flow characteristics of a first fluid in a first conduit system (1). A first fluid is caused to flow through the first conduit system (1). A transverse flow parameter of the first fluid in the first conduit system (1) downstream of the conduit section (11) is detected. At least one transverse flow characteristic of the first fluid is determined from the detected transverse flow parameter. The effect of the conduit section (11) is then assessed from the determined flow characteristics.Type: GrantFiled: September 18, 2002Date of Patent: March 17, 2009Assignee: Tayside Flow Technologies LtdInventors: John Graeme Houston, Peter Arno Stonebridge, John Bruce Cameron Dick, Robert Gordon Hood, Allana Johnstone, Christophe Emmanuel Sarran, Craig McLeod Duff
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Publication number: 20080319536Abstract: There is disclosed a method for introducing a helical formation (11) into a flexible tubular material (12). The material (12) is supported together with a surrounding helical former (13) so as to deform the material (12) to have a helical indentation (11) corresponding to the shape of the former (13). The material (12) is then set in that configuration and the former (13) is removed.Type: ApplicationFiled: April 10, 2008Publication date: December 25, 2008Inventors: John Graeme Houston, Peter Arno Stonebridge, John Bruce Cameron Dick, Robert Gordon Hood, Allana Johnstone, Christophe Emmanuel Sarran, Craig McLeod Duff
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Patent number: 7331989Abstract: There is disclosed an insert (2) for a conduit (4) adapted to effect helical flow in the conduit (4) comprising a longitudinally extending member having a helical formation.Type: GrantFiled: November 21, 2002Date of Patent: February 19, 2008Assignee: Tayside Flow Technologies LimitedInventors: John Graeme Houston, Peter Arno Stonebridge, John Bruce Cameron Dick, Robert Gordon Hood, Allana Johnstone, Christophe Emmanuel Sarran, Craig McLeod Duff
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Patent number: 7185677Abstract: A helical formation (2) for a conduit (1). The helical formation (2) comprises an elongate member defining at least a portion of a helix, the elongate member comprising two inwardly extending portions (6, 7). The inwardly extending portions (6, 7) are spaced from each other and extend along the length of the elongate member in side-by-side relationship.Type: GrantFiled: November 21, 2002Date of Patent: March 6, 2007Assignee: Tayside Flow Technologies LimitedInventors: John Graeme Houston, Robert Gordon Hood, John Bruce Cameron Dick, Craig McLeod Duff, Allana Johnstone, Christophe Emmanuel Sarran, Peter Arno Stonebridge
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Publication number: 20050165289Abstract: A method of assessing the effect of a conduit section (11) on flow characteristics of a first fluid in a first conduit system (1). A first fluid is caused to flow through the first conduit system (1). A transverse flow parameter of the first fluid in the first conduit system (1) downstream of the conduit section (11) is detected. At least one transverse flow characteristic of the first fluid is determined from the detected transverse flow parameter. The effect of the conduit section (11) is then assessed from the determined flow characteristics.Type: ApplicationFiled: September 18, 2002Publication date: July 28, 2005Applicant: Tayside Flow TechnologiesInventors: John Houston, Peter Stonebridge, John, Bruce Cameron Dick, Robert Hood, Allana Johnstone, Christophem Emmanuel Sarran, Craig McLeod Duff
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Patent number: 6776194Abstract: There is a disclosed a conduit supporting structure that imposes, maintains and/or reinforces a flow guiding formation of a conduit, whereby to effect a desired flow configuration in the conduit.Type: GrantFiled: June 5, 2002Date of Patent: August 17, 2004Assignee: Tayside Flow Technologies LimitedInventors: John Graeme Houston, Peter Arno Stonebridge, John Bruce Cameron Dick, Robert Gordon Hood, Allana Johnstone, Christophe Emmanuel Sarran, Craig McLeod Duff, Allan Thomson
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Publication number: 20030139807Abstract: There is disclosed an insert (2) for a conduit (4) adapted to effect helical flow in the conduit (4) comprising a longitudinally extending member having a helical formation.Type: ApplicationFiled: November 21, 2002Publication date: July 24, 2003Inventors: John Graeme Houston, Peter Arno Stonebridge, John Bruce Cameron Dick, Robert Gordon Hood, Allana Johnstone, Christophe Emmanuel Sarran, Craig McLeod Duff
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Publication number: 20030120257Abstract: There is disclosed a method for introducing a helical formation (11) into a flexible tubular material (12). The material (12) is supported together with a surrounding helical former (13) so as to deform the material (12) to have a helical indentation (11) corresponding to the shape of the former (13). The material (12) is then set in that configuration and the former (13) is removed.Type: ApplicationFiled: November 20, 2002Publication date: June 26, 2003Inventors: John Graeme Houston, Peter Arno Stonebridge, John Bruce Cameron Dick, Robert Gordon Hood, Allana Johnstone, Christophe Emmanuel Sarran, Craig McLeod Duff
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Publication number: 20020179166Abstract: There is a disclosed a conduit supporting structure that imposes, maintains and/or reinforces a flow guiding formation of a conduit, whereby to effect a desired flow configuration in the conduit.Type: ApplicationFiled: June 5, 2002Publication date: December 5, 2002Inventors: John Graeme Houston, Peter Arno Stonebridge, John Bruce Cameron Dick, Robert Gordon Hood, Allana Johnstone, Christophe Emmanuel Sarran, Craig McLeod Duff, Allan Thomson