Patents by Inventor David W. Caldwell

David W. Caldwell 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).

  • Publication number: 20230355911
    Abstract: Systems and methods for determining a touch input are provided. The systems and methods generally include measuring the peak voltage at an electrode over a measurement period and determining a touch input based on the peak voltage. The systems and methods can conserve computing resources by deferring digital signal processing until after a peak electrode capacitance has been sampled. The systems and methods are suitable for capacitive sensors using self-capacitance and capacitive sensors using mutual capacitance. The systems and methods are also suitable for capacitive buttons, track pads, and touch screens, among other implementations.
    Type: Application
    Filed: July 12, 2023
    Publication date: November 9, 2023
    Inventor: David W. Caldwell
  • Patent number: 11730910
    Abstract: Systems and methods for determining a touch input are provided. The systems and methods generally include measuring the peak voltage at an electrode over a measurement period and determining a touch input based on the peak voltage. The systems and methods can conserve computing resources by deferring digital signal processing until after a peak electrode capacitance has been sampled. The systems and methods are suitable for capacitive sensors using self-capacitance and capacitive sensors using mutual capacitance. The systems and methods are also suitable for capacitive buttons, track pads, and touch screens, among other implementations.
    Type: Grant
    Filed: August 12, 2021
    Date of Patent: August 22, 2023
    Assignee: ALSENTIS, LLC
    Inventor: David W. Caldwell
  • Publication number: 20230175098
    Abstract: A method, and systems in which such method may be practiced, allow for the separation of elemental metals from metal alloy. A metal alloy is atomized to form metal alloy particulates. The metal alloy particulates are exposed to an oxidizing agent, such as chlorine gas in the presence of a salt, such as NaCl, an acid, such as HCl, and water. The resulting solution may be filtered to remove particulates, reduced, filtered, reduced, filtered, and so on. In aspects, the method is used to refine gold alloy by oxidation of elemental sponge gold to gold chloride followed by reduction to pure elemental gold.
    Type: Application
    Filed: January 19, 2023
    Publication date: June 8, 2023
    Inventor: David W. Caldwell
  • Patent number: 11592943
    Abstract: Systems and methods for determining a touch input are provided. The systems and methods generally include measuring the peak voltage at an electrode over a measurement period and determining a touch input based on the peak voltage. The systems and methods can conserve computing resources by deferring digital signal processing until after a peak electrode capacitance has been sampled. The systems and methods are suitable for capacitive sensors using self-capacitance and capacitive sensors using mutual capacitance. The systems and methods are also suitable for capacitive buttons, track pads, and touch screens, among other implementations.
    Type: Grant
    Filed: August 12, 2021
    Date of Patent: February 28, 2023
    Assignee: ALSENTIS, LLC
    Inventor: David W. Caldwell
  • Patent number: 11592942
    Abstract: Systems and methods for determining a touch input are provided. The systems and methods generally include measuring the peak voltage at an electrode over a measurement period and determining a touch input based on the peak voltage. The systems and methods can conserve computing resources by deferring digital signal processing until after a peak electrode capacitance has been sampled. The systems and methods are suitable for capacitive sensors using self-capacitance and capacitive sensors using mutual capacitance. The systems and methods are also suitable for capacitive buttons, track pads, and touch screens, among other implementations.
    Type: Grant
    Filed: August 12, 2021
    Date of Patent: February 28, 2023
    Assignee: ALSENTIS, LLC
    Inventor: David W. Caldwell
  • Patent number: 11578386
    Abstract: A method, and systems in which such method may be practiced, allow for the separation of elemental metals from metal alloy. A metal alloy is atomized to form metal alloy particulates. The metal alloy particulates are exposed to an oxidizing agent, such as chlorine gas in the presence of a salt, such as NaCl, an acid, such as HCl, and water. The resulting solution may be filtered to remove particulates, reduced, filtered, reduced, filtered, and so on. In aspects, the method is used to refine gold alloy by oxidation of elemental sponge gold to gold chloride followed by reduction to pure elemental gold.
    Type: Grant
    Filed: March 26, 2022
    Date of Patent: February 14, 2023
    Assignee: ENVIRO METALS, LLC
    Inventor: David W. Caldwell
  • Patent number: 11561652
    Abstract: Systems and methods for determining a touch input are provided. The systems and methods generally include measuring the peak voltage at an electrode over a measurement period and determining a touch input based on the peak voltage. The systems and methods can conserve computing resources by deferring digital signal processing until after a peak electrode capacitance has been sampled. The systems and methods are suitable for capacitive sensors using self-capacitance and capacitive sensors using mutual capacitance. The systems and methods are also suitable for capacitive buttons, track pads, and touch screens, among other implementations.
    Type: Grant
    Filed: March 4, 2015
    Date of Patent: January 24, 2023
    Assignee: ALSENTIS, LLC
    Inventor: David W. Caldwell
  • Patent number: 11524403
    Abstract: A vacuum-based end effector for engaging parcels includes a base plate, one or more vacuum cups of a first type, and one or more vacuum cups of a second type. Each vacuum cup of the vacuum-based end effector is configured to be placed in fluid communication with a vacuum source to provide the vacuum cup with a suction force which can be used to engage and grasp parcels. Each vacuum cup includes a bellows defining a pathway for a flow of air and a lip connected to the bellows. Each lip of the one or more vacuum cups of the first type comprises a foam lip, and each lip of the one or more vacuum cups of the second type comprises an elastomeric lip. The vacuum-based end effector can be combined with a robot to provide an improved system for engaging parcels.
    Type: Grant
    Filed: February 18, 2020
    Date of Patent: December 13, 2022
    Assignee: Material Handling Systems, Inc.
    Inventors: Josiah Douglas, Kurt Michael Wittmer, Michael Alan McCue, David W. Caldwell, II, Gregory Robert Sturm, Derek Robert Sturm, Thomas Anthony Hillerich, Jr.
  • Publication number: 20220213575
    Abstract: A method, and systems in which such method may be practiced, allow for the separation of elemental metals from metal alloy. A metal alloy is atomized to form metal alloy particulates. The metal alloy particulates are exposed to an oxidizing agent, such as chlorine gas in the presence of a salt, such as NaCl, an acid, such as HCl, and water. The resulting solution may be filtered to remove particulates, reduced, filtered, reduced, filtered, and so on. In aspects, the method is used to refine gold alloy by oxidation of elemental sponge gold to gold chloride followed by reduction to pure elemental gold.
    Type: Application
    Filed: March 26, 2022
    Publication date: July 7, 2022
    Inventor: David W. Caldwell
  • Patent number: 11241802
    Abstract: A dual-material vacuum cup for a vacuum-based end effector includes a bellows having a proximal end configured for connection to the end effector and a distal end. The bellows also defines a pathway for a flow of air. A lip is connected to the distal end of the bellows, the lip defining an opening in fluid communication with the pathway for the flow of air. An insert is then connected to a distal end of the lip, and the insert is in fluid communication with the opening defined by the lip. To engage parcels of various dimension and construction, the lip is composed of a first material (such as silicone rubber or another elastomeric material), while the insert is comprised of a second material (such as a foam material).
    Type: Grant
    Filed: February 18, 2020
    Date of Patent: February 8, 2022
    Assignee: Material Handling Systems, Inc.
    Inventors: Josiah Douglas, Derek Robert Sturm, David W. Caldwell, II
  • Patent number: 11192145
    Abstract: A singulating system for parcels comprises: an inner wall; a first section comprised of a series of driven rollers, which are skewed relative to a longitudinal direction of travel, so that the parcels are conveyed not only in the longitudinal direction of travel, but also toward the inner wall; a second section for receiving the parcels from the first section, and then identifying and moving parcels in a side-by-side arrangement and/or parcels with an irregular shape; and a third section for receiving the parcels from the second section. In some embodiments, the singulating system also includes a visioning subsystem, including a camera for acquiring image data of the parcels as the parcels move toward or into the second section, and a computer to receive and analyze the image data from the camera to identify parcels in a side-by-side arrangement and/or parcels with an irregular shape.
    Type: Grant
    Filed: October 2, 2019
    Date of Patent: December 7, 2021
    Assignee: Material Handling Systems, Inc.
    Inventors: Gregory Robert Sturm, Jonathan Dean Terrell, Thomas Anthony Hillerich, Jr., Michael Alan McCue, David W. Caldwell, II, Derek Robert Sturm
  • Publication number: 20210376830
    Abstract: Systems and methods for determining a touch input are provided. The systems and methods generally include measuring the peak voltage at an electrode over a measurement period and determining a touch input based on the peak voltage. The systems and methods can conserve computing resources by deferring digital signal processing until after a peak electrode capacitance has been sampled. The systems and methods are suitable for capacitive sensors using self-capacitance and capacitive sensors using mutual capacitance. The systems and methods are also suitable for capacitive buttons, track pads, and touch screens, among other implementations.
    Type: Application
    Filed: August 12, 2021
    Publication date: December 2, 2021
    Inventor: David W. Caldwell
  • Publication number: 20210376829
    Abstract: Systems and methods for determining a touch input are provided. The systems and methods generally include measuring the peak voltage at an electrode over a measurement period and determining a touch input based on the peak voltage. The systems and methods can conserve computing resources by deferring digital signal processing until after a peak electrode capacitance has been sampled. The systems and methods are suitable for capacitive sensors using self-capacitance and capacitive sensors using mutual capacitance. The systems and methods are also suitable for capacitive buttons, track pads, and touch screens, among other implementations.
    Type: Application
    Filed: August 12, 2021
    Publication date: December 2, 2021
    Inventor: David W. Caldwell
  • Publication number: 20210373684
    Abstract: Systems and methods for determining a touch input are provided. The systems and methods generally include measuring the peak voltage at an electrode over a measurement period and determining a touch input based on the peak voltage. The systems and methods can conserve computing resources by deferring digital signal processing until after a peak electrode capacitance has been sampled. The systems and methods are suitable for capacitive sensors using self-capacitance and capacitive sensors using mutual capacitance. The systems and methods are also suitable for capacitive buttons, track pads, and touch screens, among other implementations.
    Type: Application
    Filed: August 12, 2021
    Publication date: December 2, 2021
    Inventor: David W. Caldwell
  • Patent number: 10994309
    Abstract: A system for identifying and transferring parcels includes a robot singulator configured to engage and transfer individual parcels in a bulk flow of multiple parcels on a first conveyor to a singulated stream of parcels on a second conveyor. The system further includes a vision and control subsystem, with a first camera for acquiring image data of the bulk flow of multiple parcels, and a computer that receives and processes the image data to identify and segment individual parcels, and then communicates instructions to the robot singulator to engage and transfer each of the individual parcels to the second conveyor. The system may further include a second camera for acquiring image data of the individual parcels to confirm placement on the second conveyor. The system may further include first and second indexing conveyors controlled by the vision and control subsystem for delivering parcels to the robot singulator.
    Type: Grant
    Filed: March 24, 2020
    Date of Patent: May 4, 2021
    Assignee: Material Handling Systems, Inc.
    Inventors: Thomas Anthony Hillerich, Jr., Michael Alan McCue, Gregory Robert Sturm, David W. Caldwell, II, Derek Robert Sturm
  • Publication number: 20200262087
    Abstract: A dual-material vacuum cup for a vacuum-based end effector includes a bellows having a proximal end configured for connection to the end effector and a distal end. The bellows also defines a pathway for a flow of air. A lip is connected to the distal end of the bellows, the lip defining an opening in fluid communication with the pathway for the flow of air. An insert is then connected to a distal end of the lip, and the insert is in fluid communication with the opening defined by the lip. To engage parcels of various dimension and construction, the lip is composed of a first material (such as silicone rubber or another elastomeric material), while the insert is comprised of a second material (such as a foam material).
    Type: Application
    Filed: February 18, 2020
    Publication date: August 20, 2020
    Inventors: Josiah Douglas, Derek Robert Sturm, David W. Caldwell, II
  • Publication number: 20200262069
    Abstract: A vacuum-based end effector for engaging parcels includes a base plate, one or more vacuum cups of a first type, and one or more vacuum cups of a second type. Each vacuum cup of the vacuum-based end effector is configured to be placed in fluid communication with a vacuum source to provide the vacuum cup with a suction force which can be used to engage and grasp parcels. Each vacuum cup includes a bellows defining a pathway for a flow of air and a lip connected to the bellows. Each lip of the one or more vacuum cups of the first type comprises a foam lip, and each lip of the one or more vacuum cups of the second type comprises an elastomeric lip. The vacuum-based end effector can be combined with a robot to provide an improved system for engaging parcels.
    Type: Application
    Filed: February 18, 2020
    Publication date: August 20, 2020
    Inventors: Josiah Douglas, Kurt Michael Wittmer, Michael Alan McCue, David W. Caldwell, II, Gregory Robert Sturm, Derek Robert Sturm, Thomas Anthony Hillerich, JR.
  • Publication number: 20200222945
    Abstract: A system for identifying and transferring parcels includes a robot singulator configured to engage and transfer individual parcels in a bulk flow of multiple parcels on a first conveyor to a singulated stream of parcels on a second conveyor. The system further includes a vision and control subsystem, with a first camera for acquiring image data of the bulk flow of multiple parcels, and a computer that receives and processes the image data to identify and segment individual parcels, and then communicates instructions to the robot singulator to engage and transfer each of the individual parcels to the second conveyor. The system may further include a second camera for acquiring image data of the individual parcels to confirm placement on the second conveyor. The system may further include first and second indexing conveyors controlled by the vision and control subsystem for delivering parcels to the robot singulator.
    Type: Application
    Filed: March 24, 2020
    Publication date: July 16, 2020
    Inventors: Thomas Anthony Hillerich, JR., Michael Alan McCue, Gregory Robert Sturm, David W. Caldwell, II, Derek Robert Sturm
  • Patent number: 10646898
    Abstract: A system for identifying and transferring parcels includes a robot singulator configured to engage and transfer individual parcels in a bulk flow of multiple parcels on a first conveyor to a singulated stream of parcels on a second conveyor. The system further includes a vision and control subsystem, with a first camera for acquiring image data of the bulk flow of multiple parcels, and a computer that receives and processes the image data to identify and segment individual parcels, and then communicates instructions to the robot singulator to engage and transfer each of the individual parcels to the second conveyor. The system may further include a second camera for acquiring image data of the individual parcels to confirm placement on the second conveyor. The system may further include first and second indexing conveyors controlled by the vision and control subsystem for delivering parcels to the robot singulator.
    Type: Grant
    Filed: June 6, 2018
    Date of Patent: May 12, 2020
    Assignee: Material Handling Systems, Inc.
    Inventors: Thomas Anthony Hillerich, Jr., Michael Alan McCue, Gregory Robert Sturm, David W. Caldwell, II, Derek Robert Sturm
  • Publication number: 20200108414
    Abstract: A singulating system for parcels comprises: an inner wall; a first section comprised of a series of driven rollers, which are skewed relative to a longitudinal direction of travel, so that the parcels are conveyed not only in the longitudinal direction of travel, but also toward the inner wall; a second section for receiving the parcels from the first section, and then identifying and moving parcels in a side-by-side arrangement and/or parcels with an irregular shape; and a third section for receiving the parcels from the second section. In some embodiments, the singulating system also includes a visioning subsystem, including a camera for acquiring image data of the parcels as the parcels move toward or into the second section, and a computer to receive and analyze the image data from the camera to identify parcels in a side-by-side arrangement and/or parcels with an irregular shape.
    Type: Application
    Filed: October 2, 2019
    Publication date: April 9, 2020
    Inventors: Gregory Robert STURM, Jonathan Dean TERRELL, Thomas Anthony HILLERICH, JR., Michael Alan MCCUE, David W. CALDWELL, II, Derek Robert STURM