Patents by Inventor Derek Stewart

Derek Stewart 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: 11957343
    Abstract: Surgical fasteners for use with articulating surgical instruments are disclosed. In one embodiment, a surgical fastener may include a head, a shaft extending distally from the head, and a through bore extending through the shaft from a proximal surface of the head to a distal end of the shaft. A fastener carrier of a surgical instrument may be slidably received in the through bore, and the through bore may be sized and shaped to have two or fewer contact points with the fastener carrier when the fastener carrier is in a fully articulated configuration. In another embodiment, a fastener may include a head, a shaft extending distally from the head and including a distal tip, a sloped surface sloping toward the distal tip, and a through bore passing through the head, shaft, and sloped surface. The sloped surface may terminate at two shoulders located on opposing sides of the through bore.
    Type: Grant
    Filed: February 12, 2021
    Date of Patent: April 16, 2024
    Assignee: C.R. Bard, Inc.
    Inventors: Nathan Stewart Cauldwell, Augustus Felix, Derek Affonce, Kevin J. Ranucci
  • Patent number: 11944289
    Abstract: Articulating surgical instruments are disclosed. In one embodiment, a surgical instrument may include an elongated shaft assembly including an articulable portion moveable between a non-articulated configuration and an articulated configuration. First and second articulating shafts of the elongated shaft assembly may be coaxially arranged and axially fixed at an attachment point located distally from the articulable portion. Proximal portions of the first and second articulating shafts may be displaceable in opposing directions to articulate the articulable portion from the non-articulated configuration to the articulated configuration. In another embodiment, an articulation control may be movable from a first position to a second position to move an articulation lock from a locked configuration to an unlocked configuration to selectively permit articulation of a surgical instrument. The articulation lock also may be movable from the second position to a third position to articulate the surgical instrument.
    Type: Grant
    Filed: August 12, 2021
    Date of Patent: April 2, 2024
    Assignee: C.R. Bard, Inc.
    Inventors: Augustus Felix, Derek J. Leatzow, Nathan Stewart Cauldwell, Derek Affonce, Kevin J. Ranucci, Tomas Matusaitis, Alan Bachman
  • Publication number: 20240069517
    Abstract: According to at least one aspect of the present disclosure a method of managing workflow for an industrial application is provided. The method comprises providing a guidance device configured to be communicatively coupled to a tool configured to be used on a workpiece, obtaining identification data pertaining to the workpiece being used in the industrial application, obtaining industrial application state data pertaining to at least one state of the industrial application, obtaining workpiece state data, operating the tool on the workpiece, obtaining tool operation data, uploading to a service, via the guidance device, at least one of the identification data, the industrial application state data, and the tool operation data, and validating the industrial application state data.
    Type: Application
    Filed: August 26, 2022
    Publication date: February 29, 2024
    Inventors: Chizuruoke C. Chikwendu, Joshua Napoli, Shirshak Sharma, Derek Stewart, Dylan Sumiskum, Kaitlen A. Sousa, Payal A. Zanwar
  • Patent number: 11887640
    Abstract: A magnetoelectric memory device includes a magnetic tunnel junction located between a first electrode and a second electrode. The magnetic tunnel junction includes a reference layer, a nonmagnetic tunnel barrier layer, a free layer, and a dielectric capping layer. At least one layer that provides voltage-controlled magnetic anisotropy is provided within the magnetic tunnel junction, which may include a pair of nonmagnetic metal dust layers located on, or within, the free layer, or a two-dimensional metal compound layer including a compound of a nonmagnetic metallic element and a nonmetallic element.
    Type: Grant
    Filed: June 7, 2021
    Date of Patent: January 30, 2024
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Derek Stewart, Alan Kalitsov, Bhagwati Prasad
  • Patent number: 11889702
    Abstract: A magnetoelectric memory device includes a magnetic tunnel junction located between a first electrode and a second electrode. The magnetic tunnel junction includes a reference layer, a nonmagnetic tunnel barrier layer, a free layer, and a dielectric capping layer. At least one layer that provides voltage-controlled magnetic anisotropy is provided within the magnetic tunnel junction, which may include a pair of nonmagnetic metal dust layers located on, or within, the free layer, or a two-dimensional metal compound layer including a compound of a nonmagnetic metallic element and a nonmetallic element.
    Type: Grant
    Filed: June 7, 2021
    Date of Patent: January 30, 2024
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Alan Kalitsov, Derek Stewart, Bhagwati Prasad
  • Patent number: 11871679
    Abstract: A magnetoelectric memory device includes a magnetic tunnel junction located between a first electrode and a second electrode. The magnetic tunnel junction includes a reference layer, a nonmagnetic tunnel barrier layer, a free layer, and a dielectric capping layer. At least one layer that provides voltage-controlled magnetic anisotropy is provided within the magnetic tunnel junction, which may include a pair of nonmagnetic metal dust layers located on, or within, the free layer, or a two-dimensional metal compound layer including a compound of a nonmagnetic metallic element and a nonmetallic element.
    Type: Grant
    Filed: June 7, 2021
    Date of Patent: January 9, 2024
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Alan Kalitsov, Derek Stewart, Bhagwati Prasad
  • Patent number: 11839162
    Abstract: Magnetoelectric or magnetoresistive memory cells may include a plurality of reference layers and optionally a plurality of free layers to enhance the tunneling magnetoresistance (TMR) ratio.
    Type: Grant
    Filed: June 25, 2021
    Date of Patent: December 5, 2023
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Alan Kalitsov, Derek Stewart, Bhagwati Prasad, Goran Mihajlovic
  • Publication number: 20230307029
    Abstract: A magnetoresistive memory cell includes a first terminal electrode, a second terminal electrode, and a magnetoresistive layer stack located between the first terminal electrode and the second terminal electrode and including, from one side to another, a reference layer, a dielectric tunnel barrier layer, a free layer, and a material layer having two different states of lattice deformation which have different average in-plane lattice constants and which are configured to apply different in-plane stress. The material layer may be a metal-insulator transition (MIT) material layer that exhibits a phase transition between an insulator state and a metal state.
    Type: Application
    Filed: October 20, 2022
    Publication date: September 28, 2023
    Inventors: Alan KALITSOV, Derek STEWART, Bhagwati PRASAD
  • Publication number: 20230307027
    Abstract: A magnetoresistive memory cell includes a magnetoresistive layer stack containing a reference layer, a nonmagnetic spacer layer, and a free layer. A ferroelectric material layer having two stable ferroelectric states is coupled to a strain-modulated ferromagnetic layer to alter a sign of magnetic exchange coupling between the strain-modulated ferromagnetic layer and the free layer. The strain-modulated ferromagnetic layer may be the reference layer or a perpendicular magnetic anisotropy layer that is located proximate to the ferroelectric material layer. The magnetoresistive memory cell may be configured as a three-terminal device or as a two-terminal device, and may be configured as a tunneling magnetoresistance (TMR) device or as a giant magnetoresistance (GMR) device.
    Type: Application
    Filed: March 24, 2022
    Publication date: September 28, 2023
    Inventors: Alan KALITSOV, Derek STEWART, Ananth KAUSHIK, Gerardo BERTERO
  • Publication number: 20230307028
    Abstract: A magnetoresistive memory cell includes a magnetoresistive layer stack containing a reference layer, a nonmagnetic spacer layer, and a free layer. A ferroelectric material layer having two stable ferroelectric states is coupled to a strain-modulated ferromagnetic layer to alter a sign of magnetic exchange coupling between the strain-modulated ferromagnetic layer and the free layer. The strain-modulated ferromagnetic layer may be the reference layer or a perpendicular magnetic anisotropy layer that is located proximate to the ferroelectric material layer. The magnetoresistive memory cell may be configured as a three-terminal device or as a two-terminal device, and may be configured as a tunneling magnetoresistance (TMR) device or as a giant magnetoresistance (GMR) device.
    Type: Application
    Filed: March 24, 2022
    Publication date: September 28, 2023
    Inventors: Alan KALITSOV, Derek STEWART, Ananth KAUSHIK, Gerardo BERTERO
  • Publication number: 20220393100
    Abstract: A magnetoelectric memory device includes a magnetic tunnel junction located between a first electrode and a second electrode. The magnetic tunnel junction includes a reference layer, a nonmagnetic tunnel barrier layer, a free layer, and a dielectric capping layer. At least one layer that provides voltage-controlled magnetic anisotropy is provided within the magnetic tunnel junction, which may include a pair of nonmagnetic metal dust layers located on, or within, the free layer, or a two-dimensional metal compound layer including a compound of a nonmagnetic metallic element and a nonmetallic element.
    Type: Application
    Filed: June 7, 2021
    Publication date: December 8, 2022
    Inventors: Alan KALITSOV, Derek STEWART, Bhagwati PRASAD
  • Publication number: 20220392505
    Abstract: A magnetoelectric memory device includes a magnetic tunnel junction located between a first electrode and a second electrode. The magnetic tunnel junction includes a reference layer, a nonmagnetic tunnel barrier layer, a free layer, and a dielectric capping layer. At least one layer that provides voltage-controlled magnetic anisotropy is provided within the magnetic tunnel junction, which may include a pair of nonmagnetic metal dust layers located on, or within, the free layer, or a two-dimensional metal compound layer including a compound of a nonmagnetic metallic element and a nonmetallic element.
    Type: Application
    Filed: June 7, 2021
    Publication date: December 8, 2022
    Inventors: Derek STEWART, Alan KALITSOV, Bhagwati PRASAD
  • Publication number: 20220392953
    Abstract: A magnetoelectric memory device includes a magnetic tunnel junction located between a first electrode and a second electrode. The magnetic tunnel junction includes a reference layer, a nonmagnetic tunnel barrier layer, a free layer, and a dielectric capping layer. At least one layer that provides voltage-controlled magnetic anisotropy is provided within the magnetic tunnel junction, which may include a pair of nonmagnetic metal dust layers located on, or within, the free layer, or a two-dimensional metal compound layer including a compound of a nonmagnetic metallic element and a nonmetallic element.
    Type: Application
    Filed: June 7, 2021
    Publication date: December 8, 2022
    Inventors: Alan KALITSOV, Derek STEWART, Bhagwati PRASAD
  • Patent number: 11443790
    Abstract: A magnetoresistive memory device includes a first electrode, a second electrode that is spaced from the first electrode, and a perpendicular magnetic tunnel junction layer stack located between the first electrode and the second electrode. The perpendicular magnetic tunnel junction layer stack includes, from one side to another: a reference layer having a fixed reference magnetization direction, a first spinel layer located including a first polycrystalline spinel material having (001) texture along an axial direction that is perpendicular to an interface with the reference layer, a magnesium oxide layer including a polycrystalline magnesium oxide material having (001) texture along the axial direction, a second spinel layer including a second polycrystalline spinel material having (001) texture along the axial direction, and a ferromagnetic free layer.
    Type: Grant
    Filed: March 4, 2021
    Date of Patent: September 13, 2022
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Bhagwati Prasad, Derek Stewart, Matthew Carey, Tiffany Santos
  • Patent number: 11417379
    Abstract: A magnetoresistive memory device includes a magnetic tunnel junction including a free layer, at least two tunneling dielectric barrier layers, and at least one metallic quantum well layer. The quantum well layer leads to the resonant electron tunneling through the magnetic tunnel junction in such a way that it strongly enhances the tunneling probability for one of the magnetization states of the free layer, while this tunneling probability remains much smaller in the opposite magnetization state of the free layer. The device can be configured in a spin transfer torque device configuration, a voltage-controlled magnetic anisotropy, a voltage controlled exchange coupling device configuration, or a spin-orbit-torque device configuration.
    Type: Grant
    Filed: October 27, 2020
    Date of Patent: August 16, 2022
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventors: Alan Kalitsov, Bhagwati Prasad, Derek Stewart
  • Patent number: 11411170
    Abstract: A magnetoresistive memory device includes a magnetic tunnel junction including a free layer, at least two tunneling dielectric barrier layers, and at least one metallic quantum well layer. The quantum well layer leads to the resonant electron tunneling through the magnetic tunnel junction in such a way that it strongly enhances the tunneling probability for one of the magnetization states of the free layer, while this tunneling probability remains much smaller in the opposite magnetization state of the free layer. The device can be configured in a spin transfer torque device configuration, a voltage-controlled magnetic anisotropy, a voltage controlled exchange coupling device configuration, or a spin-orbit-torque device configuration.
    Type: Grant
    Filed: October 27, 2020
    Date of Patent: August 9, 2022
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventors: Alan Kalitsov, Bhagwati Prasad, Derek Stewart
  • Publication number: 20220196363
    Abstract: An archery bow facility for launching an arrow includes a flexible bow and a bow string connected to the bow. A sensor connected to the bow is operable to generate a datastream based on a condition of the bow. A processor and display in communication with the sensor is operable to receive the datastream and to determine a first bow position at a moment of initiation of release when the bowstring is released by a user. The processor, based on the datastream, then operates to determine a second bow position at a moment of conclusion of release when the arrow departs the bowstring. The processor may operate in conjunction with the display to communicate to a user information about the difference between the first and second positions. The first and second position may be first and second angular orientations, and the sensor is preferably a multi-axis accelerometer.
    Type: Application
    Filed: December 15, 2021
    Publication date: June 23, 2022
    Inventors: Austin Allgaier, Justin Rogness, Derek Stewart
  • Patent number: 11349066
    Abstract: A magnetoresistive memory device includes a magnetic tunnel junction including a free layer, at least two tunneling dielectric barrier layers, and at least one metallic quantum well layer. The quantum well layer leads to the resonant electron tunneling through the magnetic tunnel junction in such a way that it strongly enhances the tunneling probability for one of the magnetization states of the free layer, while this tunneling probability remains much smaller in the opposite magnetization state of the free layer. The device can be configured in a spin transfer torque device configuration, a voltage-controlled magnetic anisotropy, a voltage controlled exchange coupling device configuration, or a spin-orbit-torque device configuration.
    Type: Grant
    Filed: October 27, 2020
    Date of Patent: May 31, 2022
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventors: Alan Kalitsov, Bhagwati Prasad, Derek Stewart
  • Publication number: 20220130442
    Abstract: A magnetoresistive memory device includes a magnetic tunnel junction including a free layer, at least two tunneling dielectric barrier layers, and at least one metallic quantum well layer. The quantum well layer leads to the resonant electron tunneling through the magnetic tunnel junction in such a way that it strongly enhances the tunneling probability for one of the magnetization states of the free layer, while this tunneling probability remains much smaller in the opposite magnetization state of the free layer. The device can be configured in a spin transfer torque device configuration, a voltage-controlled magnetic anisotropy, a voltage controlled exchange coupling device configuration, or a spin-orbit-torque device configuration.
    Type: Application
    Filed: October 27, 2020
    Publication date: April 28, 2022
    Inventors: Alan KALITSOV, Bhagwati PRASAD, Derek STEWART
  • Publication number: 20220131068
    Abstract: A magnetoresistive memory device includes a magnetic tunnel junction including a free layer, at least two tunneling dielectric barrier layers, and at least one metallic quantum well layer. The quantum well layer leads to the resonant electron tunneling through the magnetic tunnel junction in such a way that it strongly enhances the tunneling probability for one of the magnetization states of the free layer, while this tunneling probability remains much smaller in the opposite magnetization state of the free layer. The device can be configured in a spin transfer torque device configuration, a voltage-controlled magnetic anisotropy, a voltage controlled exchange coupling device configuration, or a spin-orbit-torque device configuration.
    Type: Application
    Filed: October 27, 2020
    Publication date: April 28, 2022
    Inventors: Alan KALITSOV, Bhagwati PRASAD, Derek STEWART