Patents by Inventor David D. Zhang

David D. Zhang 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: 20210000546
    Abstract: Methods and system perform tool tracking during minimally invasive robotic surgery. Tool states are determined. using triangulation techniques or a Bayesian filter from either or both non-endoscopically derived and endoscopically derived tool state information, or from either or both non-visually derived and visually derived tool state information. The non-endoscopically derived tool state information is derived from sensor data provided either by sensors associated with a mechanism for manipulating the tool, or sensors capable of detecting identifiable signals emanating or reflecting from the tool and indicative of its position, of external cameras viewing an end of the tool extending out of the body. The endoscopically derived tool state information is derived from image data provided by an endoscope inserted in the body so as to view the tool.
    Type: Application
    Filed: June 24, 2020
    Publication date: January 7, 2021
    Inventors: Brian D. Hoffman, David Q. Larkin, Giuseppe Maria Prisco, Guanghua G. Zhang, Rajesh Kumar
  • Patent number: 10842571
    Abstract: Methods and system perform tool tracking during minimally invasive robotic surgery. Tool states are determined using triangulation techniques or a Bayesian filter from either or both non-endoscopically derived and endoscopically derived tool state information, or from either or both non-visually derived and visually derived tool state information. The non-endoscopically derived tool state information is derived from sensor data provided either by sensors associated with a mechanism for manipulating the tool, or sensors capable of detecting identifiable signals emanating or reflecting from the tool and indicative of its position, or external cameras viewing an end of the tool extending out of the body. The endoscopically derived tool state information is derived from image data provided by an endoscope inserted in the body so as to view the tool.
    Type: Grant
    Filed: July 14, 2017
    Date of Patent: November 24, 2020
    Assignee: Intuitive Surgical Operations, Inc.
    Inventors: Brian D. Hoffman, David Q. Larkin, Giuseppe Maria Prisco, Guanghua G. Zhang, Rajesh Kumar
  • Patent number: 10792107
    Abstract: Methods and system perform tool tracking during minimally invasive robotic surgery. Tool states are determined using triangulation techniques or a Bayesian filter from either or both non-endoscopically derived and endoscopically derived tool state information, or from either or both non-visually derived and visually derived tool state information. The non-endoscopically derived tool state information is derived from sensor data provided either by sensors associated with a mechanism for manipulating the tool, or sensors capable of detecting identifiable signals emanating or reflecting from the tool and indicative of its position, or external cameras viewing an end of the tool extending out of the body. The endoscopically derived tool state information is derived from image data provided by an endoscope inserted in the body so as to view the tool.
    Type: Grant
    Filed: December 6, 2016
    Date of Patent: October 6, 2020
    Assignee: Intuitive Surgical Operations, Inc.
    Inventors: Brian D. Hoffman, David Q. Larkin, Giuseppe Maria Prisco, Guanghua G. Zhang, Rajesh Kumar
  • Patent number: 10696771
    Abstract: Provided is a method for preparing a latex composition, comprising providing an ethylene copolymer comprising copolymerized units of ethylene and copolymerized units of at least one polar comonomer; dissolving the ethylene copolymer with one or more latex monomers to prepare a solution; mixing the solution with water; optionally adding a surfactant or protectant colloid to form an aqueous emulsion; and polymerizing the latex monomer in the emulsion to form a latex composition comprising the ethylene copolymer and a latex polymer. Further provided are the emulsion polymerization product and the mini-emulsion polymerization product of at least one ethylene copolymer substantially dissolved in at least one latex monomer, such as an acrylic, styrene or vinyl monomer. Finally, formulated products comprising or produced from the emulsion or mini-emulsion polymerization product and articles comprising or produced from the formulated products are provided.
    Type: Grant
    Filed: March 28, 2016
    Date of Patent: June 30, 2020
    Assignee: Performance Materials NA, Inc.
    Inventors: David D Zhang, David M Dean, Elizabeth R Griffin, Richard Allen Hayes, Donna Lynn Visioli
  • Publication number: 20200073122
    Abstract: A display system includes a head-mounted display unit and a wake control system. The head-mounted display unit provides content to a user and is operable in a low-power state and a high-power state that consumes more power to provide the content to the user than the low-power state. The wake control system determines when to operate in the high-power state. The wake control system may assess a first wake criterion with low power, assess a second wake criterion with higher power than the first wake criterion upon satisfaction of the first wake criterion, and cause the head-mounted display unit to operate in the high-power state upon satisfaction of the second wake criterion.
    Type: Application
    Filed: June 21, 2019
    Publication date: March 5, 2020
    Inventors: Fletcher R. Rothkopf, David A. Kalinowski, Jae Hwang Lee, Avi Bar-Zeev, Grant H. Mulliken, Paul Meade, Nathanael D. Parkhill, Ray L. Chang, Arthur Y. Zhang
  • Publication number: 20190247131
    Abstract: Methods and system perform tool tracking during minimally invasive robotic surgery. Tool states are determined using triangulation techniques or a Bayesian filter from either or both non-endoscopically derived and endoscopically derived tool state information, or from either or both non-visually derived and visually derived tool state information. The non-endoscopically derived tool state information is derived from sensor data provided either by sensors associated with a mechanism for manipulating the tool, or sensors capable of detecting identifiable signals emanating or reflecting from the tool and indicative of its position, or external cameras viewing an end of the tool extending out of the body. The endoscopically derived tool state information is derived from image data provided by an endoscope inserted in the body so as to view the tool.
    Type: Application
    Filed: April 26, 2019
    Publication date: August 15, 2019
    Inventors: Brian D. Hoffman, David Q. Larkin, Giuseppe Maria Prisco, Guanghua G. Zhang, Rajesh Kumar
  • Patent number: 9688848
    Abstract: Disclosed is a laminar shaped article comprising a heterogeneous blend of (a) a composition comprising a vinyl halide or vinylidene halide polymer and optionally an ethylene copolymer containing carboxyl and/or carbon monoxide moieties, and (b) a polyolefin functionalized with a comonomer selected from the group consisting of maleic anhydride, maleic acid diesters, maleic acid monoesters, itaconic anhydride, itaconic acid diesters, itaconic acid monoesters, fumaric acid diesters, fumaric acid monoesters, or combinations thereof as a compatibilizer; and (c) a polyamide wherein the polyamide is present in the vinyl halide or vinylidene halide polymer as a multitude of overlapping layers.
    Type: Grant
    Filed: July 30, 2013
    Date of Patent: June 27, 2017
    Assignee: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: David D Zhang, Elizabeth R Griffin
  • Publication number: 20160280905
    Abstract: Provided is a method for preparing a latex composition, comprising providing an ethylene copolymer comprising copolymerized units of ethylene and copolymerized units of at least one polar comonomer; dissolving the ethylene copolymer with one or more latex monomers to prepare a solution; mixing the solution with water; optionally adding a surfactant or protectant colloid to form an aqueous emulsion; and polymerizing the latex monomer in the emulsion to form a latex composition comprising the ethylene copolymer and a latex polymer. Further provided are the emulsion polymerization product and the mini-emulsion polymerization product of at least one ethylene copolymer substantially dissolved in at least one latex monomer, such as an acrylic, styrene or vinyl monomer. Finally, formulated products comprising or produced from the emulsion or mini-emulsion polymerization product and articles comprising or produced from the formulated products are provided.
    Type: Application
    Filed: March 28, 2016
    Publication date: September 29, 2016
    Inventors: DAVID D. ZHANG, DAVID M. DEAN, ELIZABETH R. GRIFFIN, RICHARD ALLEN HAYES, DONNA LYNN VISIOLI
  • Patent number: 9206316
    Abstract: Disclosed is a thermoplastic elastomer composition comprising (i) about 10-60 wt % of at least one aliphatic polyamide; (ii) about 0.8-15 wt % of at least one graft-modified ethylene-olefin elastomeric copolymer; (iii) about 0.8-15 wt % of at least one graft-modified ethylene-propylene elastomeric copolymer, and (iv) about 35-85 wt % of at least one polyether-ester-amide block copolymer having a shore D of about 50-60 (as measured in accordance with ASTM D2240), with the total wt % of all components in the composition totaling to 100 wt %. Further disclosed herein is an article made from the thermoplastic elastomer composition disclosed above.
    Type: Grant
    Filed: December 21, 2012
    Date of Patent: December 8, 2015
    Assignee: E I DU PONT DE NEMOURS AND COMPANY
    Inventors: David D Zhang, Zhongyu Wang
  • Patent number: 8722761
    Abstract: The disclosure provides a melt processible theromoplastic composition, comprising a major proportion of a base polymer comprising a first melt processible thermoplastic polymer having a first Fedor's solubility parameter and a first viscosity; and a combination of a carrier polymer and a surface modifying additive, the carrier polymer comprising a second melt processible thermoplastic polymer which has a second Fedor's solubility parameter that is at least about 2.5 (J/cm3)1/2 lower than the first Fedor's solubility parameter, and a second viscosity, the carrier polymer being adhered to the surface modifying additive, and wherein the first viscosity is at least about 10 times the second viscosity.
    Type: Grant
    Filed: October 29, 2009
    Date of Patent: May 13, 2014
    Assignee: E I du Pont de Nemours and Company
    Inventors: Narayanan Sankara Subramanian, David D. Zhang
  • Patent number: 8512838
    Abstract: Disclosed is a laminar shaped article comprising a heterogeneous blend of (a) a composition comprising a vinyl halide or vinylidene halide polymer and optionally an ethylene copolymer containing carboxyl and/or carbon monoxide moieties, and (b) a polyolefin functionalized with a comonomer selected from the group consisting of maleic anhydride, maleic acid diesters, maleic acid monoesters, itaconic anhydride, itaconic acid diesters, itaconic acid monoesters, fumaric acid diesters, fumaric acid monoesters, or combinations thereof as a compatibilizer; and (c) a polyamide wherein the polyamide is present in the vinyl halide or vinylidene halide polymer as a multitude of overlapping layers.
    Type: Grant
    Filed: November 23, 2009
    Date of Patent: August 20, 2013
    Assignee: E I du Pont de Nemours and Company
    Inventors: David D. Zhang, Elizabeth R. Griffin
  • Patent number: 8048957
    Abstract: Disclosed is a composition comprising a blend and a modifier in which the blend comprises polycarbonate and acrylonitrile/butadiene/styrene terpolymer and 15 weight % or less of a modifier wherein the modifier comprises an ethylene ester copolymer and either an acrylonitrile butadiene styrene block copolymer or a core-shell polymer. Also disclosed are shaped articles prepared from the composition.
    Type: Grant
    Filed: May 20, 2009
    Date of Patent: November 1, 2011
    Assignee: E.I. du Pont de Nemours and Company
    Inventor: David D. Zhang
  • Patent number: 7834089
    Abstract: Disclosed are compositions of ethylene acid copolymers and EVOH that are useful for fabricating films, sheets and other shaped articles such as tubing, bottle, fuel tank, tray etc. comprising (1) an ethylene vinyl alcohol copolymer; and (2) a copolymer comprising in-chain copolymerized units of (a) in-chain copolymerized units of ethylene; (b) in-chain polymerized units of an ?,?-unsaturated C3-C8 carboxylic acid; (c) in-chain polymerized units of at least one comonomer that is an ethylenically unsaturated dicarboxylic acid or derivative thereof; and optionally (d) in-chain copolymerized units of alkyl acrylate or alkyl methacrylate, and wherein the carboxylic acid functionalities present are at least partially neutralized by one or more alkali metal, transition metal, or alkaline earth metal cations. The compositions can be used for packaging of foodstuffs, medical solutions and industrial chemicals.
    Type: Grant
    Filed: May 8, 2007
    Date of Patent: November 16, 2010
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: David D. Zhang
  • Publication number: 20100129576
    Abstract: Disclosed is a laminar shaped article comprising a heterogeneous blend of (a) a composition comprising a vinyl halide or vinylidene halide polymer and optionally an ethylene copolymer containing carboxyl and/or carbon monoxide moieties, and (b) a polyolefin functionalized with a comonomer selected from the group consisting of maleic anhydride, maleic acid diesters, maleic acid monoesters, itaconic anhydride, itaconic acid diesters, itaconic acid monoesters, fumaric acid diesters, fumaric acid monoesters, or combinations thereof as a compatibilizer; and (c) a polyamide wherein the polyamide is present in the vinyl halide or vinylidene halide polymer as a multitude of overlapping layers.
    Type: Application
    Filed: November 23, 2009
    Publication date: May 27, 2010
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: David D. ZHANG, Elizabeth R. GRIFFIN
  • Publication number: 20100113644
    Abstract: The disclosure provides a melt processible theromoplastic composition, comprising a major proportion of a base polymer comprising a first melt processible thermoplastic polymer having a first Fedor's solubility parameter and a first viscosity; and a combination of a carrier polymer and a surface modifying additive, the carrier polymer comprising a second melt processible thermoplastic polymer which has a second Fedor's solubility parameter that is at least about 2.5 (J/cm3)1/2 lower than the first Fedor's solubility parameter, and a second viscosity, the carrier polymer being adhered to the surface modifying additive, and wherein the first viscosity is at least about 10 times the second viscosity.
    Type: Application
    Filed: October 29, 2009
    Publication date: May 6, 2010
    Applicant: E.I. DU PONT DE NEMOURS AND COMPANY
    Inventors: NARAYANAN SANKARA SUBRAMANIAN, David D. Zhang
  • Publication number: 20090292083
    Abstract: A polycarbonate and acrylonitrile/butadiene/styrene terpolymer blend comprises 15 weight % or less of a modifier combination, wherein the modifier combination comprises an ethylene ester copolymer and an acrylonitrile butadiene styrene block copolymer, and optionally at least one additional comonomer selected from the group consisting of alky acrylates and alkyl methacrylates; or a core-shell polymer. Also disclosed are shaped articles prepared from the composition.
    Type: Application
    Filed: May 20, 2009
    Publication date: November 26, 2009
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventor: David D. Zhang
  • Publication number: 20080281045
    Abstract: Disclosed are compositions of ethylene acid copolymers and EVOH that are useful for fabricating films, sheets and other shaped articles such as tubing, bottle, fuel tank, tray etc. comprising (1) an ethylene vinyl alcohol copolymer; and (2) a copolymer comprising in-chain copolymerized units of (a) in-chain copolymerized units of ethylene; (b) in-chain polymerized units of an ?,?-unsaturated C3-C8 carboxylic acid; (c) in-chain polymerized units of at least one comonomer that is an ethylenically unsaturated dicarboxylic acid or derivative thereof; and optionally (d) in-chain copolymerized units of alkyl acrylate or alkyl methacrylate, and wherein the carboxylic acid functionalities present are at least partially neutralized by one or more alkali metal, transition metal, or alkaline earth metal cations. The compositions can be used for packaging of foodstuffs, medical solutions and industrial chemicals.
    Type: Application
    Filed: May 8, 2007
    Publication date: November 13, 2008
    Inventor: David D. Zhang
  • Patent number: 5574108
    Abstract: The present invention is directed to extrudable sealants which are particularly well suited for bonding a metal based, lidding material to a polystyrene container. The most preferred sealant compositions of the present invention preferably contain an acid copolymer, a tackifier and a polyolefin.
    Type: Grant
    Filed: April 18, 1995
    Date of Patent: November 12, 1996
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Vladimir Antonov, David D. Zhang, Stephen R. Tanny, Alister M. Soutar
  • Patent number: 5516583
    Abstract: The inventive adhesive composition provides a whitening effect upon peeling. The composition comprises (A) ethylene vinyl acetate polymer, ethylene acrylate polymer or mixtures thereof; (B) a styrene polymer, and optionally (C) a polyolefin.
    Type: Grant
    Filed: August 29, 1994
    Date of Patent: May 14, 1996
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: David D. Zhang, I-Hwa Lee