Patents by Inventor L. Letts

L. Letts 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: 9809741
    Abstract: Methods and compositions for stimulating of the production of hydrocarbons (e.g., formation crude oil and/or formation gas) from subterranean formations, and methods of selecting a composition for treating an oil or gas well. In some embodiments, the compositions are emulsions or microemulsions, which may include water, a terpene, and a surfactant.
    Type: Grant
    Filed: August 29, 2016
    Date of Patent: November 7, 2017
    Assignee: Flotek Chemistry, LLC
    Inventors: Randal M. Hill, Lakia M. Champagne, Nathan L. Lett, Maria Elizabeth Green, Hasnain Saboowala
  • Publication number: 20160369161
    Abstract: Methods and compositions for stimulating of the production of hydrocarbons (e.g., formation crude oil and/or formation gas) from subterranean formations, and methods of selecting a composition for treating an oil or gas well. In some embodiments, the compositions are emulsions or microemulsions, which may include water, a terpene, and a surfactant.
    Type: Application
    Filed: August 29, 2016
    Publication date: December 22, 2016
    Applicant: Flotek Chemistry, LLC
    Inventors: Randal M. Hill, Lakia M. Champagne, Nathan L. Lett, Maria Elizabeth Green, Hasnain Saboowala
  • Patent number: 9464223
    Abstract: Methods and compositions comprising an emulsion or a microemulsion for use in various aspects of the life cycle of an oil and/or gas well are provided. In some embodiments, the emulsion or the microemulsion comprises water, a solvent, and a surfactant, and optionally, one or more additives.
    Type: Grant
    Filed: March 14, 2014
    Date of Patent: October 11, 2016
    Assignee: Flotek Chemistry, LLC
    Inventors: Lakia M. Champagne, Angus Fursdon-Welsh, Nathan L. Lett, Maria Elizabeth Green
  • Patent number: 9428683
    Abstract: Methods and compositions for stimulating of the production of hydrocarbons (e.g., formation crude oil and/or formation gas) from subterranean formations, and methods of selecting a composition for treating an oil or gas well. In some embodiments, the compositions are emulsions or microemulsions, which may include water, a terpene, and a surfactant.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: August 30, 2016
    Assignee: Flotek Chemistry, LLC
    Inventors: Randal M. Hill, Lakia M. Champagne, Nathan L. Lett, Maria Elizabeth Green, Hasnain Saboowala
  • Publication number: 20160194550
    Abstract: Methods for treating an oil or gas well having a wellbore and selecting compositions for treating an oil or gas well having a wellbore.
    Type: Application
    Filed: March 16, 2016
    Publication date: July 7, 2016
    Applicant: Flotek Chemistry, LLC
    Inventors: Randal M. Hill, Lakia M. Champagne, Nathan L. Lett, Keith Ingram Dismuke, David Germack, Nicole Mast, Melinda Soeung
  • Patent number: 9321955
    Abstract: Methods for treating an oil or gas well having a wellbore and selecting compositions for treating an oil or gas well having a wellbore.
    Type: Grant
    Filed: June 14, 2013
    Date of Patent: April 26, 2016
    Assignee: Flotek Chemistry, LLC
    Inventors: Randal M. Hill, Lakia M. Champagne, Nathan L. Lett, Keith Ingram Dismuke, David Germack, Nicole Mast, Melinda Soeung
  • Publication number: 20160060505
    Abstract: A well treatment composition is well-designed for the simultaneous enhancement of the production of both liquid and gaseous hydrocarbons from the same reservoir on a non-selective basis. The well treatment composition includes a first surfactant and a second surfactant, wherein the second surfactant is selected from the group consisting of ethoxylated alkylene amines, ethoxylated alkyl amines, propoxylated alkylene amines, propoxylated alkyl amines, ethoxylated-propoxylated alkylene amines and ethoxylated-propoxylated alkyl amines. The well treatment composition also includes a first solvent, a second solvent and water. Methods for using the well treatment composition include the steps of emplacing the well treatment composition into wells having high and low gas-to-oil ratios.
    Type: Application
    Filed: November 11, 2015
    Publication date: March 3, 2016
    Applicant: CESI Chemical, Inc.
    Inventors: Andrei Zelenev, Lakia M. Champagne, Bill Zhou, Nathan L. Lett, Keith Ingram Dismuke, Glenn S. Penny
  • Patent number: 9200192
    Abstract: A well treatment composition is well-designed for the simultaneous enhancement of the production of both liquid and gaseous hydrocarbons from the same reservoir on a non-selective basis. The well treatment composition includes a first surfactant and a second surfactant, wherein the second surfactant is selected from the group consisting of ethoxylated alkylene amines, ethoxylated alkyl amines, propoxylated alkylene amines, propoxylated alkyl amines, ethoxylated-propoxylated alkylene amines and ethoxylated-propoxylated alkyl amines. The well treatment composition also includes a first solvent, a second solvent and water. Methods for using the well treatment composition include the steps of emplacing the well treatment composition into wells having high and low gas-to-oil ratios.
    Type: Grant
    Filed: May 8, 2013
    Date of Patent: December 1, 2015
    Assignee: CESI Chemical, Inc.
    Inventors: Andrei Zelenev, Lakia M. Champagne, Bill Zhou, Nathan L. Lett, Keith Ingram Dismuke, Glenn S. Penny
  • Publication number: 20150252249
    Abstract: Methods and compositions for stimulating of the production of hydrocarbons (e.g., formation crude oil and/or formation gas) from subterranean formations are provided. In some embodiments, the compositions are emulsions or microemulsions, which may include water, a terpene, and a surfactant. In some embodiments, methods of selecting a composition for treating an oil or gas well are provided.
    Type: Application
    Filed: May 26, 2015
    Publication date: September 10, 2015
    Applicant: CESI Chemical, Inc.
    Inventors: Randal M. Hill, Lakia M. Champagne, Nathan L. Lett, Maria Elizabeth Green
  • Patent number: 9068108
    Abstract: Methods and compositions for stimulating of the production of hydrocarbons (e.g., formation crude oil and/or formation gas) from subterranean formations are provided. In some embodiments, the compositions are emulsions or microemulsions, which may include water, a terpene, and a surfactant. In some embodiments, methods of selecting a composition for treating an oil or gas well are provided.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: June 30, 2015
    Assignee: CESI Chemical, Inc.
    Inventors: Randal M. Hill, Lakia M. Champagne, Nathan L. Lett, Maria Elizabeth Green
  • Publication number: 20140371115
    Abstract: Methods and compositions for stimulating of the production of hydrocarbons (e.g., formation crude oil and/or formation gas) from subterranean formations are provided. In some embodiments, the compositions are emulsions or microemulsions, which may include water, a solvent, and a surfactant. In some embodiments, methods of selecting a composition for treating an oil or gas well are provided.
    Type: Application
    Filed: June 14, 2013
    Publication date: December 18, 2014
    Inventors: Randal M. Hill, Lakia C. Champagne, Nathan L. Lett, Keith Ingram Dismuke, David Germack, Nicole Mast, Melinda Soeung
  • Publication number: 20140367107
    Abstract: Methods and compositions for stimulating of the production of hydrocarbons (e.g., formation crude oil and/or formation gas) from subterranean formations are provided. In some embodiments, the compositions are emulsions or microemulsions, which may include water, a solvent, and a surfactant. In some embodiments, methods of selecting a composition for treating an oil or gas well are provided.
    Type: Application
    Filed: June 14, 2013
    Publication date: December 18, 2014
    Applicant: CESI Chemical
    Inventors: Randal M. Hill, Lakia C. Champagne, Nathan L. Lett, Keith Ingram Dismuke, David Germack, Nicole Mast, Melinda Soeung
  • Publication number: 20140338911
    Abstract: Methods and compositions comprising an emulsion or a microemulsion for use in various aspects of the life cycle of an oil and/or gas well are provided. In some embodiments, the emulsion or the microemulsion comprises water, a solvent, and a surfactant, and optionally, one or more additives.
    Type: Application
    Filed: March 14, 2014
    Publication date: November 20, 2014
    Applicant: CESI Chemical Inc.
    Inventors: Keith Ingram Dismuke, Randal M. Hill, Andrei Zelenev, James Silas, David Germack, Lakia M. Champagne, Charles Earl Hammond, John T. Pursley, Glenn S. Penny, Michael A. Bryan, Maria Elizabeth Green, Monica Gonzalez-Roldan, Melinda Soeung, Hasnain Saboowala, Angus Fursdon-Welsh, Nathan L. Lett, Nicole Mast, Joby Hughes
  • Publication number: 20140284057
    Abstract: Methods and compositions comprising an emulsion or a microemulsion for use in various aspects of the life cycle of an oil and/or gas well are provided. In some embodiments, the emulsion or the microemulsion comprises water, a solvent, and a surfactant, and optionally, one or more additives.
    Type: Application
    Filed: March 14, 2014
    Publication date: September 25, 2014
    Applicant: CESI Chemical Inc.
    Inventors: Lakia C. Champagne, Angus Fursdon-Welsh, Nathan L. Lett, Maria Elizabeth Green
  • Publication number: 20140274817
    Abstract: Methods and compositions for stimulating of the production of hydrocarbons (e.g., formation crude oil and/or formation gas) from subterranean formations are provided. In some embodiments, the compositions are emulsions or microemulsions, which may include water, a terpene, and a surfactant. In some embodiments, methods of selecting a composition for treating an oil or gas well are provided.
    Type: Application
    Filed: March 14, 2013
    Publication date: September 18, 2014
    Inventors: Randal M. Hill, Lakia C. Champagne, Nathan L. Lett, Maria Elizabeth Green
  • Publication number: 20140262261
    Abstract: Methods and compositions for stimulating of the production of hydrocarbons (e.g., formation crude oil and/or formation gas) from subterranean formations are provided. In some embodiments, the compositions are emulsions or microemulsions, which may include water, a terpene, and a surfactant. In some embodiments, methods of selecting a composition for treating an oil or gas well are provided.
    Type: Application
    Filed: March 14, 2013
    Publication date: September 18, 2014
    Inventors: Randal M. Hill, Lakia C. Champagne, Nathan L. Lett, Maria Elizabeth Green
  • Publication number: 20070238740
    Abstract: The invention describes novel nitrosated and/or nitrosylated cardiovascular compounds or pharmaceutically acceptable salts thereof, and novel compositions comprising at least one nitrosated and/or nitrosylated cardiovascular compound, and, optionally, at least one nitric oxide donor and/or at least one therapeutic agent. The invention also provides novel compositions and kits comprising at least one cardiovascular compound of the invention, that is optionally nitrosated and/or nitrosylated, and, optionally, at least one nitric oxide donor compound and/or at least one therapeutic agent. The invention also provides methods for (a) treating cardiovascular diseases; (b) treating renovascular diseases; (c) treating diabetes; (d) treating diseases resulting from oxidative stress; (e) treating endothelial dysfunctions; (f) treating diseases caused by endothelial dysfunctions; (g) treating cirrhosis; (h) treating pre-eclampsia; (j) treating osteoporosis; and (k) treating nephropathy.
    Type: Application
    Filed: August 20, 2004
    Publication date: October 11, 2007
    Applicant: NitroMed, Inc.
    Inventors: David Garvey, L. Letts, Manuel Worcel
  • Publication number: 20070179150
    Abstract: The invention describes novel nitrosated proton pump inhibitor compounds and pharmaceutically acceptable salts thereof, and novel compositions comprising at least one nitrosated proton pump inhibitor compound, and, optionally, at least one compound that donates, transfers or releases nitric oxide, stimulates endogenous synthesis of nitric oxide, elevates endogenous levels of endothelium-derived relaxing factor or is a substrate for nitric oxide synthase, and/or at least one therapeutic agent. The invention also provides novel compositions comprising at least one nitrosated proton pump inhibitor compound, and at least one compound that donates, transfers or releases nitric oxide, elevates endogenous levels of endothelium-derived relaxing factor, stimulates endogenous synthesis of nitric oxide or is a substrate for nitric oxide synthase and/or at least one therapeutic agent.
    Type: Application
    Filed: March 22, 2007
    Publication date: August 2, 2007
    Applicant: NitroMed, Inc.
    Inventors: Xinqin Fang, David Garvey, L. Letts
  • Publication number: 20070179195
    Abstract: The invention provides novel nitrosated and/or nitrosylated cyclooxygenase 2 (COX-2) selective inhibitors and novel compositions and kits comprising at least one nitrosated and/or nitrosylated cyclooxygenase 2 (COX-2) selective inhibitor, and, optionally, at least one compound that donates, transfers or releases nitric oxide, stimulates endogenous synthesis of nitric oxide, elevates endogenous levels of endothelium-derived relaxing factor or is a substrate for nitric oxide synthase, and/or, optionally, at least one therapeutic agent. The invention also provides methods for treating inflammation, pain and fever; for treating and/or improving the gastrointestinal properties of COX-2 selective inhibitors; for facilitating wound healing; for treating and/or preventing renal and/or respiratory toxicity; for treating and/or preventing other disorders resulting from elevated levels of cyclooxygenase-2; and for improving the cardiovascular profile of COX-2 selective inhibitors.
    Type: Application
    Filed: April 4, 2007
    Publication date: August 2, 2007
    Applicant: NitroMed, Inc.
    Inventors: L. Letts, David Garvey
  • Publication number: 20070155781
    Abstract: Disclosed are (i) compounds of a steroid, a ?-agonist, an anticholinergic, a mast cell stabilizer and a phosphodiesterase (PDE) inhibitor directly or indirectly linked to a NO or NO2 group or a group which stimulates endogenous production of NO or EDRF in vivo; (ii) compositions of steroids, ?-agonists, anticholinergics, mast cell stabilizers and PDE inhibitors, which can optionally be substituted with at least one NO or NO2 moiety or a group which stimulates endogenous production of NO or EDRF in vivo, and a compound that donates, transfers or releases nitric oxide as a charged species, i.e., nitrosonium (NO+) or nitroxyl (NO?), or as the neutral species, nitric oxide (NO.) or that stimulates endogenous production of NO or EDRF in vivo; and (iii) uses for them in preventing and/or treating respiratory disorders.
    Type: Application
    Filed: November 28, 2006
    Publication date: July 5, 2007
    Inventors: David Garvey, L. Letts, H. Renfroe, Stewart Richardson