Patents by Inventor David Caldwell

David 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).

  • Patent number: 11851178
    Abstract: An unmanned aerial vehicle (UAV) that provides increased operational flight endurance and efficiency. The UAV includes a power generation system, which includes an internal combustion engine and one or more batteries (batteries). The power generation system is configured to generate power for propulsion of the UAV. The internal combustion engine is configured to power a lift propeller, generating vertical lift of the UAV, and the batteries are configured to power a micro-propeller assembly, propelling the UAV in a forward direction or multiple additional directions.
    Type: Grant
    Filed: February 14, 2020
    Date of Patent: December 26, 2023
    Assignee: The Aerospace Corporation
    Inventors: Steven Beck, David Caldwell, Christopher Hartney, Bernard Harris Jefferson, Jr., Jeffrey Lang, John Morales, Martin Panevsky, Kasemsan Siri, Evan Ulrich, Richard Welle, Allyson Yarbrough
  • Patent number: 11319613
    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: August 18, 2021
    Date of Patent: May 3, 2022
    Assignee: Enviro Metals, LLC
    Inventor: David Caldwell
  • Publication number: 20220056555
    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: August 18, 2021
    Publication date: February 24, 2022
    Inventor: David Caldwell
  • Publication number: 20210253240
    Abstract: An unmanned aerial vehicle (UAV) that provides increased operational flight endurance and efficiency. The UAV includes a power generation system, which includes an internal combustion engine and one or more batteries (batteries). The power generation system is configured to generate power for propulsion of the UAV. The internal combustion engine is configured to power a lift propeller, generating vertical lift of the UAV, and the batteries are configured to power a micro-propeller assembly, propelling the UAV in a forward direction or multiple additional directions.
    Type: Application
    Filed: February 14, 2020
    Publication date: August 19, 2021
    Inventors: Steven BECK, David CALDWELL, Christopher HARTNEY, Bernard Harris JEFFERSON, JR., Jeffrey LANG, John MORALES, Martin PANEVSKY, Kasemsan SIRI, Evan ULRICH, Richard WELLE, Allyson YARBROUGH
  • Publication number: 20190185877
    Abstract: The disclosure provides polynucleotide molecules encoding novel defensins conferring increased pest tolerance and/or pesticidal activity when expressed in a plant, and recombinant DNA constructs and vectors comprising these molecules. Methods of making transgenic plants comprising recombinant defensin-encoding polynucleotide molecules and constructs, and transgenic plants, plant parts and seeds produced by these methods are provided. Compositions comprising one or more novel defensins of the disclosure are also provided having pesticidal and/or anti-microbial activity, as well as methods of their use.
    Type: Application
    Filed: January 19, 2017
    Publication date: June 20, 2019
    Inventors: Patrick Boyle, David Caldwell, Jaishree Chittoor, Jintai Huang, Susanne Kjemtrup, Gerrit Segers
  • Patent number: 10251352
    Abstract: The present invention relates to methods for identifying cucumber lines having increased resistance to Downy Mildew, and identification of genetic markers linked to gene(s) conditioning such increased disease resistance. The present invention also relates to methods of breeding cucumber plants from lines having increased Downy Mildew resistance by marker-assisted selection, compositions including nucleic acid probes or primers which are useful for such marker assisted selection, and plants and plant parts produced by such methods.
    Type: Grant
    Filed: May 22, 2014
    Date of Patent: April 9, 2019
    Assignee: SEMINIS VEGETABLE SEEDS, INC.
    Inventors: David Caldwell, Eva King-Fan Chan, Jeroen de Vries, Tarek Joobeur, Joseph J. King, Antonio Reina, Nischit Shetty
  • Patent number: 9680502
    Abstract: A transmitting device may implement a checksum for integrity verification for a message page during an auto-negotiation period. The checksum may provide redundancy to ensure the integrity of the message page after transmission. The checksum may be calculated based on the message page and appended to the message page for transmission. A receiving device may receive the message page with the appended checksum and calculate a checksum locally using the received message page. The calculated and received checksum may be compared by the receiving device to verify the integrity of the message.
    Type: Grant
    Filed: May 6, 2015
    Date of Patent: June 13, 2017
    Assignee: AVAGO TECHNOLOGIES GENERAL IP (SINGAPORE) PTE. LTD.
    Inventors: Patricia Ann Thaler, Maurice David Caldwell, Gregory Lee Silvus
  • Patent number: 9544091
    Abstract: A network device includes a communication interface and a transmitter coupled to the communication interface. The transmitter is configured to determine to start an auto-negotiation page with a link partner, and transmit, through the communication interface, a start delimiter for the auto-negotiation page. The transmitter transmits the start delimiter by transmitting a first pulse comprising a first encoding violation, followed by a second pulse comprising a second encoding violation. The transmitter may shorten the first pulse and the second pulse relative to a different pre-defined start delimiter to define spectral content for the first pulse and the second pulse that passes different first and second receiver filters in the link partner for different first and second communication standards.
    Type: Grant
    Filed: May 8, 2015
    Date of Patent: January 10, 2017
    Assignee: Broadcom Corporation
    Inventors: Patricia Ann Thaler, Maurice David Caldwell, Gregory Lee Silvus
  • Publication number: 20170002994
    Abstract: A portable lighting device for providing illumination includes a body dimensioned and sized to the held by one hand, and adapted to contain a power source therein. A head on the body has a recess in which a light source in the recess is electrically as connected to the power source. The recess and the light source are configured to generate a unidirectional light pattern. A switch enables the light source to be selectively energized by the power source, and a volumetric optical unit is configured for attachment to the head over the recess and the light source to generate an isotropic light pattern.
    Type: Application
    Filed: January 28, 2015
    Publication date: January 5, 2017
    Applicant: Venntis Technologies, LLC
    Inventors: Daniel J. Fisher, Justin Teitt, Bill Schaefer, Jay Caldwell, Scott Liston, David Caldwell
  • Publication number: 20160284352
    Abstract: A machine-readable medium and a network device are provided for speech-to-text translation. Speech packets are received at a broadband telephony interface and stored in a buffer. The speech packets are processed and textual representations thereof are displayed as words on a display device. Speech processing is activated and deactivated in response to a command from a subscriber.
    Type: Application
    Filed: June 6, 2016
    Publication date: September 29, 2016
    Inventors: Charles David CALDWELL, John Bruce HARLOW, Robert J. SAYKO, Norman Shaye
  • Patent number: 9361888
    Abstract: A machine-readable medium and a network device are provided for speech-to-text translation. Speech packets are received at a broadband telephony interface and stored in a buffer. The speech packets are processed and textual representations thereof are displayed as words on a display device. Speech processing is activated and deactivated in response to a command from a subscriber.
    Type: Grant
    Filed: July 16, 2013
    Date of Patent: June 7, 2016
    Assignee: AT&T Intellectual Property II, L.P.
    Inventors: Charles David Caldwell, John Bruce Harlow, Robert J. Sayko, Norman Shaye
  • Publication number: 20150363727
    Abstract: A method for automatically allocating use of an asset is disclosed. Such a method includes tracking proximity of a first asset relative to a second asset and determining when the first asset is proximate the second asset. The method further senses use of the second asset while the first asset is proximate the second asset. Sensing use may include sensing vibration of the second asset, temperature of the second asset, electrical current drawn by the second asset, or the like. The method automatically allocates use of the second assert to at least one of the first asset, an entity associated with the first asset, and a project associated with the first asset. A corresponding system and computer program product are also disclosed herein.
    Type: Application
    Filed: June 15, 2015
    Publication date: December 17, 2015
    Inventors: David R. Hall, Davido L. Hyer, Mark D. Hall, Joel W. Pomije, Richard D. Brinkworth, Sky A. Evans, David Caldwell, Pablo A. Penailillo
  • Publication number: 20150363740
    Abstract: A method for automatically allocating the time of an individual to a project is disclosed. Such a method includes associating a project with a location, such as the location of an asset, and tracking proximity of an individual to the location. A “project” may include work associated with a particular client, work order, assignment, or the like. A “location” may include a stationary or changing location. The method further determines an amount of time that the individual is deemed to be proximate the location. The method automatically allocates time of the individual to the project during the time the individual is proximate the location. In certain embodiments, the method further enables the individual to manually adjust the time that is allocated to the project during the time the individual is proximate the location. A corresponding system and computer program product are also disclosed.
    Type: Application
    Filed: June 15, 2015
    Publication date: December 17, 2015
    Inventors: David R. Hall, Davido L. Hyer, Mark D. Hall, Joel W. Pomije, Richard D. Brinkworth, Sky A. Evans, David Caldwell, Pablo A. Penailillo
  • Publication number: 20150363726
    Abstract: A method for automatically allocating the time of an asset is disclosed. Such a method includes tracking proximity of a first asset relative to a second asset. The first asset may include, for example, a work order or one or more individuals. The second asset may include, for example, a piece of equipment, a room, or a work area. The method determines a duration of time the first asset is deemed to be proximate the second asset. In accordance with the duration of time, the method automatically allocates time of the second assert to at least one of the first asset, an entity associated with the first asset, and a project associated with the first asset. A corresponding system and computer program product are also disclosed herein.
    Type: Application
    Filed: June 15, 2015
    Publication date: December 17, 2015
    Inventors: David R. Hall, Davido L. Hyer, Mark D. Hall, Joel W. Pomije, Richard D. Brinkworth, Sky A. Evans, David Caldwell, Pablo A. Penailillo
  • Publication number: 20150326342
    Abstract: A network device includes a communication interface and a transmitter coupled to the communication interface. The transmitter is configured to determine to start an auto-negotiation page with a link partner, and transmit, through the communication interface, a start delimiter for the auto-negotiation page. The transmitter transmits the start delimiter by transmitting a first pulse comprising a first encoding violation, followed by a second pulse comprising a second encoding violation. The transmitter may shorten the first pulse and the second pulse relative to a different pre-defined start delimiter to define spectral content for the first pulse and the second pulse that passes different first and second receiver filters in the link partner for different first and second communication standards.
    Type: Application
    Filed: May 8, 2015
    Publication date: November 12, 2015
    Inventors: Patricia Ann Thaler, Maurice David Caldwell, Gregory Lee Silvus
  • Publication number: 20150324249
    Abstract: A transmitting device may implement a checksum for integrity verification for a message page during an auto-negotiation period. The checksum may provide redundancy to ensure the integrity of the message page after transmission. The checksum may be calculated based on the message page and appended to the message page for transmission. A receiving device may receive the message page with the appended checksum and calculate a checksum locally using the received message page. The calculated and received checksum may be compared by the receiving device to verify the integrity of the message.
    Type: Application
    Filed: May 6, 2015
    Publication date: November 12, 2015
    Inventors: Patricia Ann Thaler, Maurice David Caldwell, Gregory Lee Silvus
  • Publication number: 20150059016
    Abstract: The present invention relates to methods for identifying cucumber lines having increased resistance to Downy Mildew, and identification of genetic markers linked to gene(s) conditioning such increased disease resistance. The present invention also relates to methods of breeding cucumber plants from lines having increased Downy Mildew resistance by marker-assisted selection, compositions including nucleic acid probes or primers which are useful for such marker assisted selection, and plants and plant parts produced by such methods.
    Type: Application
    Filed: May 22, 2014
    Publication date: February 26, 2015
    Inventors: David Caldwell, Eva King-Fan Chan, Jeroen de Vries, Tarek Joobeur, Joseph J. King, Antonio Reina, Nischit Shetty
  • Patent number: 8831175
    Abstract: According to some aspects, a hybrid optic is provided. The hybrid optic comprises a capillary optic for receiving x-rays from an x-ray source at an entrance portion of the capillary optic and for providing x-rays at an exit portion of the capillary optic, and a grazing incidence multi-shell optic (GIMSO) coupled, at an entrance portion of the GIMSO, to the exit portion of the capillary optic to receive x-rays emerging from the exit portion of the capillary optic, the GIMSO including an exit portion for providing x-rays.
    Type: Grant
    Filed: May 19, 2011
    Date of Patent: September 9, 2014
    Inventors: Eric H. Silver, Gerald Austin, David Caldwell, Ting Lin
  • Patent number: 8809622
    Abstract: The present invention relates to methods for identifying cucumber lines having increased resistance to Downy Mildew, and identification of genetic markers linked to gene(s) conditioning such increased disease resistance. The present invention also relates to methods of breeding cucumber plants from lines having increased Downy Mildew resistance by marker-assisted selection, compositions including nucleic acid probes or primers which are useful for such marker assisted selection, and plants and plant parts produced by such methods.
    Type: Grant
    Filed: October 22, 2010
    Date of Patent: August 19, 2014
    Assignee: Seminis Vegetable Seeds, Inc.
    Inventors: David Caldwell, Eva Chan, Jeroen de Vries, Tarek Joobeur, Joseph King, Antonio Reina, Nischit Shetty
  • Publication number: 20130304466
    Abstract: A machine-readable medium and a network device are provided for speech-to-text translation. Speech packets are received at a broadband telephony interface and stored in a buffer. The speech packets are processed and textual representations thereof are displayed as words on a display device. Speech processing is activated and deactivated in response to a command from a subscriber.
    Type: Application
    Filed: July 16, 2013
    Publication date: November 14, 2013
    Inventors: Charles David Caldwell, John Bruce Harlow, Robert J. Sayko, Norman Shaye