Patents by Inventor Keith Durand

Keith Durand 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).

  • Patent number: 11988381
    Abstract: Apparatus and methods for debinding articles. The apparatus and methods may transform binder from furnace exhaust before the exhaust is discharged to the atmosphere. The apparatus may include a furnace retort and a reactor. The furnace retort may be configured to: exclude ambient air; and receive a carrier gas. The reactor may be configured to: receive from the retort (a) the carrier gas and (b) material removed in the retort from the article; and combust, at a temperature no greater than 750° C., the material. The material may be decomposed binder. The material may be hydrocarbon from binder that is pyrolyzed in the retort. The carrier gas may include gas that is nonflammable gas.
    Type: Grant
    Filed: June 10, 2020
    Date of Patent: May 21, 2024
    Assignee: Markforged, Inc.
    Inventors: Michelle Chao, Keith Durand, Rick Bryan Woodruff, Benjamin Hodsdon Gallup
  • Patent number: 11065036
    Abstract: An instrument port for introducing instruments into a surgical site, including a port body having a channel running therethrough from a proximal end to a distal end, an instrument sleeve in slidable contact with the channel, creating a gap therebetween, and fluid flow for removing emboli efficiently from the instrument port, wherein the fluid flow includes the gap is provided. A fluid flow system for use in an instrument port is provided. A method of removably securing an instrument sleeve to a port body by anchoring the instrument port to heart tissue, making at least one flood line in a channel, flushing out emboli, and performing surgery with the instrument port.
    Type: Grant
    Filed: September 18, 2015
    Date of Patent: July 20, 2021
    Assignees: Children's Medical Center Corporation, Massachusetts Institute of Technology
    Inventors: Christopher DiBiasio, Keith Durand, Jonathan Brigham Hopkins, Zach Traina, Alexander Slocum, Samir Nayfeh, Pedro J. del Nido, Nikolay V. Vasilyev
  • Publication number: 20200393126
    Abstract: Apparatus and methods for debinding articles. The apparatus and methods may transform binder from furnace exhaust before the exhaust is discharged to the atmosphere. The apparatus may include a furnace retort and a reactor. The furnace retort may be configured to: exclude ambient air; and receive a carrier gas. The reactor may be configured to: receive from the retort (a) the carrier gas and (b) material removed in the retort from the article; and combust, at a temperature no greater than 750° C., the material. The material may be decomposed binder. The material may be hydrocarbon from binder that is pyrolyzed in the retort. The carrier gas may include gas that is nonflammable gas.
    Type: Application
    Filed: June 10, 2020
    Publication date: December 17, 2020
    Inventors: Michelle Chao, Keith Durand, Rick Bryan Woodruff, Benjamin Hodsdon Gallup
  • Patent number: 9844394
    Abstract: The instrument ports for introducing instruments into a surgical site that are disclosed herein include a port body having a channel running therethrough from a proximal end to a distal end, an instrument sleeve in slidable contact with the channel, creating a gap therebetween, and a fluid flow element for removing emboli efficiently from the instrument port, wherein the fluid flow element includes the gap. Disclosed fluid flow systems are for use in the disclosed instrument ports. Methods are also disclosed for removably securing an instrument sleeve to a port body by anchoring the instrument port to heart tissue, making at least one flood line in a channel, flushing out emboli, and performing surgery with the instrument port.
    Type: Grant
    Filed: March 11, 2013
    Date of Patent: December 19, 2017
    Assignees: Children's Medical Center Corporation, Massachusetts Institute of Technology
    Inventors: Christopher DiBiasio, Keith Durand, Jonathan Brigham Hopkins, Zach Traina, Alexander Slocum, Samir Nayfeh, Pedro J. del Nido, Nikolay V. Vasilyev
  • Patent number: 9539762
    Abstract: A three dimensional printer incorporates a kinematic coupling between the build platform and movable stage which holds the build platform, of three curved protrusions attached to one of the build platform or the movable stage and six locating features formed in receivers of the other. At least two flexures differentially change a Z position of each of two of the curved protrusions. 3D printing is paused at a preset level of completion, and the build platform may be removed for external operations. A print resume circuit resumes printing of additional printed layers at the previous position in response to a return detection circuit that responds to an input (e.g., a touch screen confirmation).
    Type: Grant
    Filed: January 26, 2015
    Date of Patent: January 10, 2017
    Assignee: MARKFORGED, INC.
    Inventors: Keith Durand, Rick Bryan Woodruff, Gregory Thomas Mark
  • Publication number: 20160000463
    Abstract: An instrument port for introducing instruments into a surgical site, including a port body having a channel running therethrough from a proximal end to a distal end, an instrument sleeve in slidable contact with the channel, creating a gap therebetween, and fluid flow for removing emboli efficiently from the instrument port, wherein the fluid flow includes the gap is provided. A fluid flow system for use in an instrument port is provided. A method of removably securing an instrument sleeve to a port body by anchoring the instrument port to heart tissue, making at least one flood line in a channel, flushing out emboli, and performing surgery with the instrument port.
    Type: Application
    Filed: September 18, 2015
    Publication date: January 7, 2016
    Inventors: Christopher DiBiasio, Keith Durand, Jonathan Brigham Hopkins, Zach Traina, Alexander Slocum, Samir Nayfeh, Pedro J. del Nido, Nikolay V. Vasilyev
  • Publication number: 20150210007
    Abstract: A three dimensional printer incorporates a kinematic coupling between the build platform and movable stage which holds the build platform, of three curved protrusions attached to one of the build platform or the movable stage and six locating features formed in receivers of the other. At least two flexures differentially change a Z position of each of two of the curved protrusions. 3D printing is paused at a preset level of completion, and the build platform may be removed for external operations. A print resume circuit resumes printing of additional printed layers at the previous position in response to a return detection circuit that responds to an input (e.g., a touch screen confirmation).
    Type: Application
    Filed: January 26, 2015
    Publication date: July 30, 2015
    Applicant: MarkForged, Inc.
    Inventors: Keith DURAND, Rick Bryan WOODRUFF, Gregory Thomas MARK
  • Publication number: 20130261400
    Abstract: The instrument ports for introducing instruments into a surgical site that are disclosed herein include a port body having a channel running therethrough from a proximal end to a distal end, an instrument sleeve in slidable contact with the channel, creating a gap therebetween, and a fluid flow element for removing emboli efficiently from the instrument port, wherein the fluid flow element includes the gap. Disclosed fluid flow systems are for use in the disclosed instrument ports. Methods are also disclosed for removably securing an instrument sleeve to a port body by anchoring the instrument port to heart tissue, making at least one flood line in a channel, flushing out emboli, and performing surgery with the instrument port.
    Type: Application
    Filed: March 11, 2013
    Publication date: October 3, 2013
    Inventors: Christopher DiBiasio, Keith Durand, Jonathan Brigham Hopkins, Zach Traina, Alexander Slocum, Samir Nayfeh, Pedro J. del Nido, Nikolay V. Vasilyev
  • Patent number: 8394015
    Abstract: An instrument port for introducing instruments into a surgical site, including a port body having a channel running therethrough from a proximal end to a distal end, an instrument sleeve in slidable contact with the channel, creating a gap therebetween, and fluid flow for removing emboli efficiently from the instrument port, wherein the fluid flow includes the gap is provided. A fluid flow system for use in an instrument port is provided. A method of removably securing an instrument sleeve to a port body by anchoring the instrument port to heart tissue, making at least one flood line in a channel, flushing out emboli, and performing surgery with the instrument port.
    Type: Grant
    Filed: January 5, 2007
    Date of Patent: March 12, 2013
    Assignees: Children's Medical Center Corporation, Massachusetts Institute of Technology
    Inventors: Christopher DiBiasio, Keith Durand, Jonathan Brigham Hopkins, Zach Traina, Alexander Slocum, Samir Nayfeh, Pedro J. Del Nido, Nikolay V. Vasilyev
  • Publication number: 20090275893
    Abstract: An instrument port for introducing instruments into a surgical site, including a port body having a channel running therethrough from a proximal end to a distal end, an instrument sleeve in slidable contact with the channel, creating a gap therebetween, and fluid flow for removing emboli efficiently from the instrument port, wherein the fluid flow includes the gap is provided. A fluid flow system for use in an instrument port is provided. A method of removably securing an instrument sleeve to a port body by anchoring the instrument port to heart tissue, making at least one flood line in a channel, flushing out emboli, and performing surgery with the instrument port.
    Type: Application
    Filed: January 5, 2007
    Publication date: November 5, 2009
    Inventors: Christopher DiBiasio, Keith Durand, Jonathan Brigham Hopkins, Zach Traina, Alexander Slocum, Samir Nayfeh, Pedro de Nido
  • Patent number: RE50427
    Abstract: According to one aspect, embodiments herein provide a furnace for debinding and sintering additively manufactured parts comprising a unitarily formed retort having at least one open side, a heater for heating a sintering volume within the retort to a debinding temperature and to a sintering temperature, an end cap sealing the at least one open side, a forming gas line penetrating the end cap for supplying forming gas at a flowrate, and a heat exchanger within the retort, outside the sintering volume, and adjacent a heated wall of the retort, the heat exchanger having an inlet connected to the forming gas line and an outlet to the sintering volume, wherein the heat exchanger includes a heat exchange tube length sufficient to heat the forming gas to within 20 degrees Celsius of the sintering temperature before the forming gas exits the outlet.
    Type: Grant
    Filed: March 29, 2024
    Date of Patent: May 13, 2025
    Assignee: MARKFORGED, INC.
    Inventors: Gregory Thomas Mark, Rick Bryan Woodruff, Keith Durand, Benjamin Hodsdon Gallup, Michelle Ling Chao