Patents Examined by Gary L. Geist
  • Patent number: 5445809
    Abstract: Taxol and radiolabelled taxol are produced from sterilized Yew trees by contacting sterilized Yew tree stock with a reactor solution comprising a taxol precursor under a reducing environment. The reactor solution may also contain a reducing agent, an energy source, a buffer to maintain pH in the range of 6.0 to 8.0, and a steroid inhibitor. A radiolabelled precursor may be included in the reactor solution to produced radiolabelled taxol.
    Type: Grant
    Filed: November 3, 1992
    Date of Patent: August 29, 1995
    Assignee: Research and Development Institute at Montana State University
    Inventors: Gary A. Strobel, Andrea A. Stierle
  • Patent number: 5443813
    Abstract: Methods for the preparation and use of a biological delivery system are disclosed. The method of preparation includes the loading of a non-biological material into a biostructure having a load-bearing structure. The method also includes the removal of some of the biostructure's contents and the loading of a non-biological material into the biostructure. The biostructure is biologically compatible with the host, and preferably is derived from the host, the host's species or a related species. The loaded biostructure is used directly, or it can be targeted to specific cells, tissues and/or organs within a host. The targeted biostructure can be used to deliver the non-biological material to a specified tissue, organ or cell within a host for diagnostic, therapeutic or other purposes.
    Type: Grant
    Filed: June 6, 1991
    Date of Patent: August 22, 1995
    Assignee: Associated Universities, Inc.
    Inventor: James F. Hainfeld
  • Patent number: 5441929
    Abstract: A hydrochloric acid acidizing composition for treating a subterranean formation penetrated by a well bore to increase the production of desired materials (e.g., hydrocarbons) therefrom that includes a corrosion inhibitor for protecting both ferrous based alloy surfaces (e.g., low alloy steel surfaces) and titanium based alloy surfaces associated with the treatment from corrosion by the acid. The corrosion inhibitor includes an effective amount of a first inhibitor component for inhibiting corrosion of ferrous based alloys, the first inhibitor component including at least one chemical reducing compound, and an effective amount of a second inhibitor component for inhibiting corrosion of titanium based alloys, the second inhibitor component including at least one source of molybdate ions such as sodium molybdate. A method of treating a subterranean formation penetrated by a well bore to increase the production of desired materials therefrom is also provided.
    Type: Grant
    Filed: June 23, 1994
    Date of Patent: August 15, 1995
    Assignee: Halliburton Company
    Inventor: Michael L. Walker
  • Patent number: 5441928
    Abstract: An aqueous gellable composition capable of producing gels resistant to syneresis in the presence of divalent ions, contains:a water-soluble acrylamide polymer or copolymer,a crosslinking agent formed by a water-soluble aldehyde, or a water-soluble aldehyde and a water-soluble phenol,a water-soluble anti-syneresis agent selected from: organic carboxy acids, organic hydroxy acids and aminoacids, or among aminophosphonic acids and their alkali-metal or ammonium salts.When malonic acid is used, a delay in aqueous composition gelation is additionally obtained.
    Type: Grant
    Filed: November 25, 1992
    Date of Patent: August 15, 1995
    Assignees: Eniricerche S.p.A., AGIP S.p.A.
    Inventors: Paola Albonico, Thomas P. Lockhart
  • Patent number: 5439669
    Abstract: Oil and water emulsions containing alkylphosphoryl choline or alkylglycerophosphoryl choline surfactants are disclosed. The surfactants have the following general structures: ##STR1## In the above general structures, R.sub.1, R.sub.2 or R.sub.3 is alkyl, alkenyl, fluoroalkyl and alkenyl; and PC is the phosphoryl choline. The emulsions are useful as oxygen transport agents, artificial bloods or red blood cell substitutes.The emulsions are also useful as contrast agents for biological imaging by the modalities of nuclear magnetic resonance, x-ray and ultra sound.
    Type: Grant
    Filed: November 24, 1993
    Date of Patent: August 8, 1995
    Assignee: HemaGen/PFC
    Inventors: Robert J. Kaufman, Thomas J. Richard
  • Patent number: 5435941
    Abstract: A method of extracting corrosion inhibiting constituents from tobacco comprises the steps of soaking tobacco in an aqueous solution under certain extraction conditions, followed by filtration to remove tobacco residue from the resultant aqueous tobacco solution. This tobacco solution is used as a corrosion inhibitor to minimize the amount of corrosion occurring at galvanic corrosion cells that are established at areas of union of metals having different electrochemical potentials.
    Type: Grant
    Filed: December 6, 1994
    Date of Patent: July 25, 1995
    Assignee: University of Louisville
    Inventor: Joseph A. Von Fraunhofer
  • Patent number: 5433890
    Abstract: An aqueous polymer preservative and protectant composition containing a silicone emulsion, an aminofunctional silicone emulsion, a film forming thickening agent and a polyol.
    Type: Grant
    Filed: July 19, 1994
    Date of Patent: July 18, 1995
    Assignee: First Brands Corporation
    Inventors: Kenneth L. Meyer, Edward T. Turner, Richard L. Wolstoncroft
  • Patent number: 5230814
    Abstract: A method of producing oil soluble surfactants from lignin is disclosed, along with a method for recovering oil from underground formations by means of a surfactant flooding system containing these lignin surfactants. Lignin is reduced in the presence of a carbon monoxide or hydrogen reducing agent at high temperature and pressure, alkoxylated with an .alpha.-olefin epoxide and then changed into oil soluble lignin surfactants by a reaction selected from the group consisting of sulfonation, sulfation and alkoxysulfation.
    Type: Grant
    Filed: January 12, 1990
    Date of Patent: July 27, 1993
    Assignee: Texaco Inc.
    Inventors: Douglas G. Naae, Michael G. DaGue, Nancy G. Dunn
  • Patent number: 5221489
    Abstract: A dispersant for drilling fluids, spacer fluids, completion fluids, cement slurries and mixtures of drilling fluids and cement slurries used for drilling and cementing subterranean wells.
    Type: Grant
    Filed: February 24, 1992
    Date of Patent: June 22, 1993
    Assignee: Atlantic Richfield Company
    Inventors: James B. Bloys, Richard F. Morgan
  • Patent number: 5219475
    Abstract: An aqueous gellable composition having a delayed gelling time is disclosed, which contains a water-soluble polymer crosslinkable with Cr.sup.3+ and a crosslinking/retardant system containing a Cr.sup.3+ ion and a salicylic acid ligand, wherein said ligand can be in free form, or in the form of a complex with Cr.sup.3+, or partially in free form and partially in complexed form.Such a composition is useful for modifying the permeability in petroleum reservoirs, within a wide range of temperatures, of from about C. to C., or higher temperatures.
    Type: Grant
    Filed: March 19, 1992
    Date of Patent: June 15, 1993
    Assignees: Eniricerche S.p.A., AGIP S.p.A.
    Inventors: Thomas P. Lockhart, Paola Albonico
  • Patent number: 5219476
    Abstract: The permeability of high-permeability zones in a oil reservoir can be reduced by using a gellable aqueous composition with delayed gelation. The composition comprises:a) water;b) a high-molecular weight natural or synthetic water-soluble polymer cross-linkable by means of Cr.sup.3+ ions;c) a water-soluble inorganic Cr.sup.
    Type: Grant
    Filed: March 4, 1992
    Date of Patent: June 15, 1993
    Assignees: Eniricerche S.p.A., AGIP S.p.A.
    Inventors: Thomas P. Lockhart, Giovanni Burrafato
  • Patent number: 5217632
    Abstract: The present invention relates to a new process for preparing boron zirconium chelate solutions which are stable on the addition of acid bases, boiling, high dilution and/or aging. These chelates are useful in several industries, especially in the petroleum industry for frac fluids for treating oil or gas bearing strata especially deep hot wells. The boron zirconium chelates are prepared by forming a mixture of ammonium hydroxide, water soluble amines, sodium or potassium zirconium alpha hydroxy carboxylates selected from lactates, citrates, tartrates, glycolates, maliates, saccharates, gluconates, glycerates and mandelates, with polyols such as glycerin, erythritol, arabitol, xylitol, sorbitol, dulcitol, mannitol, inositol, monosaccharides and disaccharides and with water. This mixture is blended and then boric acid or borax as a source of boron is added and the pH is adjusted using inorganic or organic bases and/or inorganic carbonates and bicarbonates. The boron zirconium chelate solutions contain 0.1-3.
    Type: Grant
    Filed: May 11, 1992
    Date of Patent: June 8, 1993
    Assignee: Zirconium Technology Corporation
    Inventor: Sharif Sharif
  • Patent number: 5211859
    Abstract: An aqueous gel comprising an aqueous fluid containing a polymeric gelling agent, a buffer, an aluminum-based crosslinking composition and a xanthan containing retardant composition. The gel is useful for fracturing and carrying propping agents within subterranean formations.
    Type: Grant
    Filed: November 26, 1991
    Date of Patent: May 18, 1993
    Assignee: The Western Company of North America
    Inventors: Robert L. Horton, D. V. Satyanarayana Gupta
  • Patent number: 5211858
    Abstract: Polymers (and especially hydroxyethylcellulose) are crosslinked using a lanthanide as a crosslinking agent. The crosslinked polymers have utility in well completion, well stimulation, enhanced oil recovery, and subterranean fluid containment operations.
    Type: Grant
    Filed: February 26, 1992
    Date of Patent: May 18, 1993
    Assignee: Union Oil Company of California
    Inventors: Hoai T. Dovan, Richard D. Hutchins
  • Patent number: 5208284
    Abstract: Coatings compositions, which are useful as buffer layers between ceramic layers derived from polysilazane-containing compositions and ceramic layers derived from organoborosilazane polymer-containing compositions, are obtained by dissolving (A) a Group IIIa metal hydrocarbyloxide, such as aluminum sec-butoxide, (B) a Group IVb metal hydrocarbyloxide, such as zirconium propoxide, (C) a bis-, tris-, or tetrakis(dialkylamino)metal of Group IVb, such as tetrakis(diethylamino)titanium, (D) a polysilazane and/or a bis-, tris-, or tetrakis(dialkylamino)silane, such as tetrakis(dimethylamino)silane, and (E) optionally also a cyclopentadienyl Group IVb metal halide, such as bis(cyclopentadienyl)zirconium dichloride, in an organic solvent, the amounts of ingredients A-D being such that each constitutes 1-50% of their combined weights, and the amount of ingredient E being such that it constitutes 0-20% of the combined weights of the ingredients.
    Type: Grant
    Filed: December 5, 1989
    Date of Patent: May 4, 1993
    Assignee: Ethyl Corporation
    Inventor: Leonard M. Niebylski
  • Patent number: 5205964
    Abstract: A method of breaking crude oil emulsions using a water-in-oil emulsion breaker obtained by the reaction, in anhydrous conditions, for at least one hour, of an alkyl substituted phenol-formaldehyde polymer having the structure: ##STR1## wherein R is a linear or branched alkyl group having from 4-20 carbon atoms, and wherein m and n are both independent integers, the sum of which is sufficient to achieve a molecular weight of at least 1000 and further that m, but not n, may be zero with (b) ethylene carbonate, said reaction being further accomplished in a common oleophilic solvent having a boiling point of at least C., the reaction further at a temperature of at least C. in the presence of an alkaline catalyst, said catalyst being present at a concentration, based on total weight of reactants a & b, of at least about 0.1 weight percent.
    Type: Grant
    Filed: November 7, 1991
    Date of Patent: April 27, 1993
    Assignee: Nalco Chemical Company
    Inventors: W. Kirk Stephenson, J. Derwin DeShazo
  • Patent number: 5204320
    Abstract: A water based drilling fluid composition and an additive for water based drilling fluid compositions having as components poly(N-vinyl-2-pyrrolidone/sodium 2-acrylamido-2-methylpropane sulfonate) and ferrous sulfate useful in controlling high temperature water loss in drilling a well to recover oil and gas from a subterranean formation in a hostile environment and their methods of use.
    Type: Grant
    Filed: November 7, 1991
    Date of Patent: April 20, 1993
    Assignee: Phillips Petroleum Company
    Inventors: Bharat B. Patel, George G. Dixon
  • Patent number: 5202035
    Abstract: A liquid aluminum phosphate salt gelling agent comprising the reaction product of: a dialkyl phosphate formed from the reaction product of (1) a polyphosphate intermediate produced by reacting triethyl phosphate and phosphorous pentoxide and (2) a mixture of aliphatic alcohols having 6 to 10 carbons in their alkyl groups; an aluminum sulfate; and a solvent.
    Type: Grant
    Filed: February 12, 1992
    Date of Patent: April 13, 1993
    Assignee: Nalco Chemical Company
    Inventor: David A. Huddleston
  • Patent number: 5198416
    Abstract: An invert oil emulsion drilling fluid containing oil, an emulsifier such as a fatty acid soap, clay or polymer, and an alcohol such as glycerol or cyclicetherpolyol as the internal phase of the emulsion. A method using substantially water-free drilling fluid and monitoring the influx of formation water into the drilling fluid.
    Type: Grant
    Filed: September 10, 1991
    Date of Patent: March 30, 1993
    Assignee: Shell Oil Company
    Inventors: Arthur H. Hale, George C. Blytas
  • Patent number: H1475
    Abstract: A process for halogenating copolymers of an isoolefin having from 4 to 7 carbon atoms and a para-alkylstyrene in the melt phase is provided in which the halogenation reaction is performed in a continuous flow device, such as an extruder-reactor. Halogenated copolymers produced by the process are also provided.
    Type: Grant
    Filed: July 2, 1990
    Date of Patent: August 1, 1995
    Inventors: Neil F. Newman, Donald A. White, Lawrence W. Flatley, William M. Davis