Patents by Inventor David A. Stewart

David A. 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: 10141552
    Abstract: This invention relates to the protection system for battery current collectors in cameras mounted on a gun, bow, or shooting device. More particularly, the present invention relates to the system of protecting the current collectors from fracture in a camera attached to a gun barrel or shooting device as a result of recoil and shock and vibration during shooting device discharge.
    Type: Grant
    Filed: December 2, 2016
    Date of Patent: November 27, 2018
    Inventor: David A. Stewart
  • Publication number: 20180332790
    Abstract: Provided here are methods of using a mutated patatin-like phospholipase II? (“pPLAII?,” renamed here MATRILINEAL) to induce haploid induction in plants, cloning a pPLAII? to induce haploid induction in plants, and genetically engineering a plant to contain a mutated pPLAII?. Also provided are methods of applying topical and spray chemicals, lipids, and RNAi molecules to plants during pollination in order to induce haploid production. Further provided are methods of chemically treating plants during pollination to induce haploids while also reducing embryo abortion and increasing seed set.
    Type: Application
    Filed: November 17, 2016
    Publication date: November 22, 2018
    Applicant: Syngenta Participations AG
    Inventors: Timothy KELLIHER, Brent DELZER, Satya CHINTAMANANI, David Stewart SKIBBE, Zhongying CHEN, Dakota STARR, Sebastian Volker WENDEBORN, Mark LEDSON, Jeffrey David FOWLER
  • Publication number: 20180320258
    Abstract: A stainless steel alloy comprising essentially 19 to 22 percent by weight chromium, 8.5 to 10.5 percent by weight nickel, 4.5 to 5.75 percent by weight silicon, 0.8 to 2.2 percent by weight carbon, 0.0 to 0.2 percent by weight nitrogen, 0.2 to 1.2 percent by weight cobalt, 3.0 to 7.0 percent by weight manganese, 0.0 to 9.0 percent by weight niobium, 0.005 to 0.6 percent by weight titanium, 0.3 to 6.0 percent by weight molybdenum, and the balance iron plus impurities.
    Type: Application
    Filed: April 30, 2018
    Publication date: November 8, 2018
    Applicant: ROLLS-ROYCE plc
    Inventor: David A. STEWART
  • Publication number: 20180290013
    Abstract: An exercise apparatus includes a pair of step-up apparatuses wearable on feet of a user. Each step-up apparatus is configurable between an expanded configuration and a compressed configuration to simulate a selected motion when the user wearing the pair of step-up apparatuses travels by foot. One of the step-up apparatuses moves towards the expanded configuration while the other step-up apparatus moves towards the compressed configuration.
    Type: Application
    Filed: December 8, 2017
    Publication date: October 11, 2018
    Inventor: Jeffrey David Stewart
  • Patent number: 10067330
    Abstract: Methods and apparatus are described for delivering index-matching immersion liquid in high numerical-aperture optical microscopy and lithography. An array of immersion liquid droplets is delivered to a specimen substrate or specimen substrate cover by an immersion liquid printing apparatus. An immersion liquid reservoir provides immersion liquid to the printer by a precision pump. The printer delivers immersion liquid to the substrate or substrate cover in arrays of immersion liquid droplets of defined volumes and array patterns. The volumes and patterns of array droplets delivered to the substrate or substrate cover are optimized to maintain adequate immersion liquid between the substrate or substrate cover and an immersion objective while avoiding the formation of air bubbles in the immersion liquid and the accumulation of excess volumes of immersion liquid.
    Type: Grant
    Filed: June 7, 2016
    Date of Patent: September 4, 2018
    Assignee: GE HEALTHCARE BIO-SCIENCES CORP.
    Inventors: William M. Dougherty, Paul C. Goodwin, Steven A. Reese, David A. Stewart
  • Publication number: 20180238778
    Abstract: This disclosure is directed to an apparatus and method for spreading a fluid across a substrate. A spreader for spreading a fluid across a substrate includes a wiper and a frame. The wiper and the frame may mate to permit translation of the wiper across, and with respect to, the frame. The wiper spreads the fluid across the substrate and the frame supports the wiper and the substrate. The frame may also include a ramp to cause a portion of the wiper to lift away from the substrate.
    Type: Application
    Filed: April 25, 2018
    Publication date: August 23, 2018
    Inventors: Joshua NORDBERG, Daniel CAMPTON, Steve QUARRE, David STEWART
  • Patent number: 10054524
    Abstract: This disclosure is directed to an apparatus, system and method for retrieving a target material from a sample. An enrichment agent may be added to a vessel that contains the sample for positive selection, or, in other words, to select or aid in selecting the target material from amongst the remainder of the sample. The enrichment agent may be, for example, immunomagnetic beads, buoyant beads, high-density beads, chemicals to change the density of the target material, or the like.
    Type: Grant
    Filed: November 2, 2016
    Date of Patent: August 21, 2018
    Assignee: RareCyte, Inc.
    Inventors: Daniel Campton, Joshua Nordberg, Steve Quarre, David Stewart, Ronald Seubert, Jonathan Lundt, Lance U'Ren, Jennifer Chow
  • Publication number: 20180223104
    Abstract: A method may be used for reducing titanium dioxide in a composition for forming decorative paper for use in laminated products. The method may include providing a pigment composition including titanium dioxide, and combining the pigment composition with a titanium dioxide extender including at least two particulate minerals to form a combined pigment composition. The titanium dioxide extender may include diatomaceous earth and at least one of aluminosilicate and talc. Combining the pigment composition with the titanium dioxide extender may result in reducing the titanium dioxide by at least 10% while substantially maintaining at least one of whiteness, wet whiteness, brightness, wet brightness, opacity, wet opacity, and resin impregnation of the decorative paper produced including the titanium dioxide extender relative to the decorative paper produced with the titanium dioxide but without the titanium dioxide extender.
    Type: Application
    Filed: June 8, 2016
    Publication date: August 9, 2018
    Applicant: Imerys USA, Inc.
    Inventors: David STEWART, Christopher HOLMES
  • Publication number: 20180196032
    Abstract: This disclosure is directed to an apparatus, system and method for retrieving a target material from a suspension. A system includes a displacement fluid, a collector, and a primary vessel. In another implementation, the system includes a processing vessel, a displacement fluid, a collector, and a primary vessel.
    Type: Application
    Filed: March 5, 2018
    Publication date: July 12, 2018
    Inventors: Daniel E. CAMPTON, Joshua J. NORDBERG, Steve QUARRE, David STEWART, Ronald C. SEUBERT
  • Patent number: 10018538
    Abstract: This disclosure is directed to an apparatus and method for spreading a fluid across a substrate. A spreader for spreading a fluid across a substrate includes a wiper and a frame. The wiper and the frame may mate to permit translation of the wiper across, and with respect to, the frame. The wiper spreads the fluid across the substrate and the frame supports the wiper and the substrate. The frame may also include a ramp to cause a portion of the wiper to lift away from the substrate.
    Type: Grant
    Filed: November 22, 2015
    Date of Patent: July 10, 2018
    Assignee: RareCyte, Inc.
    Inventors: Joshua Nordberg, Daniel Campton, Steve Quarre, David Stewart
  • Patent number: 10013729
    Abstract: Groups of users of a social networking system are categorized based on their association with a type of malicious activity. A set of predetermined malicious groups is identified. Users associated with the malicious groups are selected based on their level of interactions with the malicious groups. Other groups associated with the selected users are identified as being potentially malicious groups. The potentially malicious groups are further analyzed based on occurrences of keywords associated with the type of malicious activity and manual verification by experts. The potentially malicious groups are either classified as being malicious or non-malicious or assigned a score based on their likelihood of being associated with the type of malicious activity. The methods and system disclosed can be used for categorizing other types of social network objects based on their association with a type of malicious activity, for example, users, events, and content.
    Type: Grant
    Filed: May 5, 2017
    Date of Patent: July 3, 2018
    Assignee: Facebook, Inc.
    Inventors: Daniel Leon Kelmenson, David Stewart Willner
  • Publication number: 20180172065
    Abstract: A ball-and-socket joint module (26) affixed to a mirror head (14) provides for adjusting a position of a mirror (16). The module includes a multicomponent ball assembly (86) that has an internally mounted spring (82). The spring presses two components (34, 72) of the ball assembly away from each other so that opposing surfaces (32, 70) of the ball assembly confront corresponding surfaces (62, 64) of a multicomponent socket assembly (90) when the ball assembly is nested within the socket assembly.
    Type: Application
    Filed: February 24, 2017
    Publication date: June 21, 2018
    Applicant: Electronic Controls Company
    Inventors: David Stewart, Andrew Sharp
  • Patent number: 9960711
    Abstract: The systems, methods, and devices of the various embodiments provide single phase inverters that may be cooperatively controlled to provide one, two, or three phase unipolar electricity. In an embodiment, a solar panel may be connected to a DC to DC converter and a unipolar power converter. In an embodiment, the unipolar power converter output may be a single phase signal approximating a desired voltage waveform and frequency, offset from the ground electrical potential such that the voltage output signal may be always positive, thus “unipolar”. In an embodiment, the unipolar power output of each string of solar panels may be connected to a dedicated, predetermined phase of a load, such as a three phase grid system. In an embodiment, the DC output of a DC to DC converter may be connected in parallel with other DC to DC converters and other unipolar converters.
    Type: Grant
    Filed: November 20, 2012
    Date of Patent: May 1, 2018
    Inventors: Sorin Spanoche, Mika Nuotio, David Stewart
  • Publication number: 20180104536
    Abstract: An exercise apparatus includes a pair of apparatuses wearable on feet of a user. Each apparatus is configurable between expanded configurations and compressed configurations to simulate a selected motion when the user wearing the pair of apparatuses travels by foot. One of the apparatuses can move towards an expanded configuration while the other apparatus moves towards a compressed configuration.
    Type: Application
    Filed: April 28, 2017
    Publication date: April 19, 2018
    Inventor: Jeffrey David Stewart
  • Patent number: 9945839
    Abstract: This disclosure is directed to an apparatus, system and method for retrieving a target material from a suspension. A system includes a displacement fluid, a collector, and a primary vessel. In another implementation, the system includes a processing vessel, a displacement fluid, a collector, and a primary vessel.
    Type: Grant
    Filed: November 14, 2016
    Date of Patent: April 17, 2018
    Assignee: RareCyte, Inc.
    Inventors: Daniel Campton, Joshua Nordberg, Steve Quarre, David Stewart, Ronald Seubert
  • Publication number: 20180050920
    Abstract: To provide a new compound with pores finely tunable in size so as to take up a specific element and release the specific element taken up in the pores as necessary, a synthesis method of the new compound, and a separation and recovery agent. The new compound represented by the following molecular formula: (NH4)[Ln(C2O4)2(H2O)] wherein Ln represents a lanthanide selected from Sm, Eu, Tb, Dy, Ho, Er, Tm, Yb, and Lu.
    Type: Application
    Filed: August 18, 2017
    Publication date: February 22, 2018
    Inventors: Takuya NANKAWA, Matthew ROSSEINSKY, David STEWART, Alexandros KATSOULIDIS
  • Publication number: 20180045720
    Abstract: Described herein are kits and components thereof used for a multiplexed analysis of a set of cytokines.
    Type: Application
    Filed: May 22, 2017
    Publication date: February 15, 2018
    Applicant: Meso Scale Technologies, LLC.
    Inventors: John Joern, Joseph Manimala, Keith McClary, Pankaj Oberoi, Gisbert Spieles, David Stewart, James Wilbur
  • Patent number: 9868020
    Abstract: An exercise apparatus includes a pair of step-up apparatuses wearable on feet of a user. Each step-up apparatus is configurable between an expanded configuration and a compressed configuration to simulate a selected motion when the user wearing the pair of step-up apparatuses travels by foot. One of the step-up apparatuses moves towards the expanded configuration while the other step-up apparatus moves towards the compressed configuration.
    Type: Grant
    Filed: November 20, 2015
    Date of Patent: January 16, 2018
    Inventor: Jeffrey David Stewart
  • Publication number: 20180003939
    Abstract: This disclosure is directed to an apparatus for securely holding a substrate, such as a microscope slide. A holder includes a frame including at least three walls, such as a base, a first arm, and a second arm. Each wall includes a platform or a portion of a platform to support the substrate. The first arm includes at least one securing block and a second arm opposite the first arm includes a secure bar with a securing block. The securing blocks include a ramp to guide the substrate off of the platforms and a stopper to set a maximum lift distance and to constrain the substrate.
    Type: Application
    Filed: September 19, 2017
    Publication date: January 4, 2018
    Applicant: RareCyte, Inc.
    Inventors: Steve Quarre, David Stewart
  • Patent number: D835748
    Type: Grant
    Filed: November 15, 2017
    Date of Patent: December 11, 2018
    Inventor: David A. Stewart