Patents Examined by Valerie Fee
  • Patent number: 5785895
    Abstract: A method for inhibiting corrosion in an aqueous medium is disclosed. The method comprises incorporating into the medium an amount of a water-soluble corrosion inhibitor sufficient to inhibit corrosion. The corrosion inhibitor comprises an N-ethoxy, 2-substituted imidazoline, the N-ethoxy substituent having from one to about thirty ethoxy units and the 2-substituent being an unsaturated or polyunsaturated fatty chain of from about six to about thirty carbons. If the medium is sweet, the inhibitor further comprises a phosphate ester derived from a water-soluble oxyethylated, straight chain alcohol of from about two to about thirty carbons. Corrosion inhibitor compositions useful in such method are also disclosed.
    Type: Grant
    Filed: December 6, 1995
    Date of Patent: July 28, 1998
    Assignee: Petrolite Corporation
    Inventors: Richard L. Martin, Jo Ann McMahon, Bernardus A. Oude Alink
  • Patent number: 5785888
    Abstract: A method for removing sulfur dioxide from gas streams, comprising contacting the gas stream with the aqueous absorption liquid, transferring the liquid to another location, then mildly heating the liquid to recover the sulfur dioxide. This absorption liquid allows removal of 99.9% of the sulfur dioxide, the recovery of very pure sulfur dioxide, is resistant to upsets due to variations in the gas stream, and is cost effective.
    Type: Grant
    Filed: March 24, 1995
    Date of Patent: July 28, 1998
    Assignee: Milmac Operating Company
    Inventors: Chien Kuei Tsai, Johnson H. Y. Fung, Raghu S. Narayan
  • Patent number: 5776362
    Abstract: A sludge dehydrating agent which is excellent in storage stability and prevented from becoming water-insoluble during storage and hence can be distributed in the market securely by solving the problem of the conventional dehydrating agents comprising amphoteric polymers that they undergo deterioration and become water-insoluble when stored for long, thus becoming substantially unusable. This dehydrating agent comprises a copolymer composed of cationic vinyl monomer units, vinylic carboxylic acid monomer units and nonionic vinyl monomer units and a salt of a group IIA metal of the periodic table. Preferable examples of the vinylic carboxylic acid monomer include acrylic, methacrylic and crotonic acids, while those of the nonionic vinyl monomer include acrylamide and methacrylamide. The metal salts usable herein include those of mineral acids and organic carboxylic acids, and preferable mineral acid salts include calcium chloride, magnesium chloride and magnesium sulfate.
    Type: Grant
    Filed: August 23, 1994
    Date of Patent: July 7, 1998
    Assignees: Kurita Water Industries Ltd., Sanyo Chemical Industries Ltd.
    Inventors: Shigeru Sato, Hisao Ohshimizu, Shinobu Kawaguchi
  • Patent number: 5766501
    Abstract: A method and composition of matter for balancing tire and rim assemblies of vehicles is disclosed wherein the composition of matter has rounded balancing elements of different sizes to line the interior of a tire casing and to move over the lining to offset points of imbalance.
    Type: Grant
    Filed: May 31, 1994
    Date of Patent: June 16, 1998
    Assignee: M & R Tire Products Inc.
    Inventors: Michael Heffernan, Russel J. Freeman
  • Patent number: 5763368
    Abstract: The present invention provides corrosion inhibited well acidizing compositions and methods of using the compositions to acidize wells. The compositions basically comprise an aqueous acid solution, a corrosion inhibitor comprising at least one quaternary ammonium compound and a corrosion inhibitor intensifier comprised of aliphatic carboxylic acids, crude tall oil, tall oil fatty acids, rosin acids and mixtures thereof.
    Type: Grant
    Filed: May 30, 1996
    Date of Patent: June 9, 1998
    Assignee: Halliburton Energy Services, Inc.
    Inventor: Michael M. Brezinski
  • Patent number: 5756006
    Abstract: A substantially inert composition has mechanical properties simulating corresponding properties of an energetic composition which may include a nitrate ester and may include a particulate organic energetic filler. A nitrate ester is replaced by a mixture of inert materials having densities less than and more than the density of the ester and present in proportions such that the mixture has substantially the density of the ester. A particulate energetic organic filler is replaced by a particulate inert organic chlorine derivative having substantially the same density. When the ester is 1,2,4-butanetriol trinitrate, which may function as a plasticizer in an elastomeric energetic composition, the less dense material is a non-volatile ester, such as dimethyl phthalate, and the more dense material includes a bromoaromatic derivative as in a mixture of pentabromodiphenyl ether and an aryl phosphate.
    Type: Grant
    Filed: December 7, 1994
    Date of Patent: May 26, 1998
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Russell Reed, Jr., Vicki Lynn Brady
  • Patent number: 5746947
    Abstract: An alkylbenzotriazole, in combination with mercaptobenzotriazole, tolyltriazole, benzotriazole and/or 1-phenyl-5-mercaptotetrazole, is used to inhibit the corrosion of metallic surfaces, particularly copper surfaces, in contact with an aqueous system. Systems and compositions are also claimed.
    Type: Grant
    Filed: June 20, 1990
    Date of Patent: May 5, 1998
    Assignee: Calgon Corporation
    Inventors: Daniel P. Vanderpool, Charles Y. Cha
  • Patent number: 5746946
    Abstract: The invention relates to imidazolidinone derivatives formed from the reaction of (1) a substituted-ethyl imidazolidinone; (2) substituted ethyl/propyl propylene urea or (3) a cyclic propylene urea with: (a) a C.sub.1 -C.sub.24 alkyl or a C.sub.3 -C.sub.24 alkenyl substituted anhydride or, (b) a C.sub.3 -C.sub.24 carboxylic acid or corresponding ester; their compositions and use as corrosion inhibitors and/or surfactants.
    Type: Grant
    Filed: December 26, 1996
    Date of Patent: May 5, 1998
    Assignee: King Idustries, Inc.
    Inventors: Zhigiang Alex He, Werner Joseph Blank
  • Patent number: 5744069
    Abstract: A water soluble metal anticorrosive comprising a tetrazole compound or a water soluble salt thereof represented by the following formula (1): ##STR1## wherein R and R' each indicate hydrogen, an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group, a phenyl group, an alkylphenyl group, an amino group, a mercapto group or an alkylmercapto group).
    Type: Grant
    Filed: November 15, 1994
    Date of Patent: April 28, 1998
    Assignee: Chiyoda Chemical Kabushiki Kaisha
    Inventors: Akio Maeda, Makoto Kanekiyo
  • Patent number: 5741758
    Abstract: A method for controlling the formation of gas hydrate crystals in a fluid mixture by admixing with said fluid mixture a polyoxyalkylenediamine in an amount effective to prevent and/or inhibit crystal growth.
    Type: Grant
    Filed: October 13, 1995
    Date of Patent: April 21, 1998
    Assignee: BJ Services Company, U.S.A.
    Inventor: Marek K. Pakulski
  • Patent number: 5728652
    Abstract: The invention provides brine based well drilling and servicing fluids which exhibit relatively thermally stable rheological and filtration characteristics. The fluids comprise a brine, an amorphous silica viscosifier, a biopolymer viscosifier, a fluid loss control additive, and a bridging agent. By utilizing both a silica viscosifier and a biopolymer viscosifier to provide the desired rheological characteristics, the fluids have enhanced thermal stability thus maintaining their suspension and hole cleaning properties over an extended temperature range.
    Type: Grant
    Filed: August 25, 1995
    Date of Patent: March 17, 1998
    Assignee: Texas United Chemical Company, LLC.
    Inventors: James W. Dobson, Jr., Ronald Lee Rock
  • Patent number: 5720823
    Abstract: A chromium and ferricyanide free aqueous deoxidizer/desmutter for aluminum and magnesium alloys contains nitric acid, ferric ions, and molybdate and/or condensed molybdate anions and preferably also sulfate and fluoride.
    Type: Grant
    Filed: December 20, 1994
    Date of Patent: February 24, 1998
    Assignee: Henkel Corporation
    Inventors: Lawrence R. Carlson, Philip M. Johnson
  • Patent number: 5718837
    Abstract: A composition containing a persulfate and a carbonate, a bicarbonate or sesquicarbonate, which composition is suitable for oxidizing wet strength resin based broke used in wet strength paper. The combination decreases the time required for effectively repulping broke from such paper. Additionally, the combination is a single product capable of beaking down the wet strength resin and adjusting or maintaining pH at a predetermined value without additional chemical treatment.
    Type: Grant
    Filed: March 17, 1997
    Date of Patent: February 17, 1998
    Assignee: FMC Corporation
    Inventors: Frank E. Caropreso, Dean S. Thorp, Robert H. Tieckelmann
  • Patent number: 5716910
    Abstract: A foamable drilling fluid for use in well operations such as deep water offshore drilling where risers are not employed in returning the fluid to the surface mud pit. A preferred foamable drilling fluid comprises a prehydrated clay such as bentonite, sea water, a surfactant selected from the group consisting of .alpha.-olefinsulfonates, alkylpolyglycosides, alcohol sulfates, salts of ethoxylated alcohol sulfates, and a stabilizing surfactant consisting of cocoamine betaine. The stabilized foam drilling fluid resists foam breakdown upon drilling cessation, prevents fluid loss to reduce filter cake buildup and increases the carrying capacity of cuttings and other solids. In addition, a foamable drilling fluid is provided including an hydraulic material selected from the group consisting of Portland cement, siliceous material like fumed silica, blast furnace slag and pozzolans such as fly ash.
    Type: Grant
    Filed: September 8, 1995
    Date of Patent: February 10, 1998
    Assignee: Halliburton Company
    Inventors: Patty L. Totten, Bobby L. King, James E. Griffith
  • Patent number: 5710109
    Abstract: An improved method for acidizing an oil bearing formation in the presence of water bearing zones having high permeability is described. An aqueous fluid is pumped into the formation preceding the injection of stimulation material. This fluid contains hydroxyethylcellulose, a fluorescent dye and an organic acid anhydride, which during hydrolysis reduces the pH and the viscosity of the solution making it retrievable without damage to the formation.
    Type: Grant
    Filed: June 12, 1995
    Date of Patent: January 20, 1998
    Assignee: Texaco Inc.
    Inventor: Billy Wayne Surles
  • Patent number: 5710107
    Abstract: The invention provides for either (a) increasing the yield point or gel strength of an aqueous based drilling fluid; (b) decreasing the fluid loss of an aqueous based drilling fluid; (c) decreasing the coefficient of friction of an aqueous based drilling fluid; or (d) decreasing the aqueous activity of an aqueous based fluid drilling fluid thus decreasing the swelling of shales contacted by an aqueous based fluid, the methods comprises adding to the drilling fluid an amount of an alkyl glycoside, preferably methyl glucoside, sufficient to effect such increase or decrease. The invention also provide for aqueous based completion fluids, workover fluids, and well working fluids containing an alkyl glucoside solubilized in the aqueous phase of said fluids.
    Type: Grant
    Filed: June 12, 1995
    Date of Patent: January 20, 1998
    Assignee: O'Brien-Goins-Simpson & Associates
    Inventor: Thad O. Walker
  • Patent number: 5707940
    Abstract: An oil-in-water emulsion composition is disclosed which comprises a mixture of brine and;(A) at least one natural oil or synthetic triglyceride of the formula ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 are independently saturated or unsaturated aliphatic groups that contain from about 7 to about 23 carbon atoms;(B) at least one alcohol, R.sup.4 OH wherein R.sup.4 is an aliphatic group containing from 1 up to about 18 carbon atoms;(C) at least one emulsifier; and(D) at least one sulfurized composition wherein (B), (C) and (D) are soluble and reside within (A).
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: January 13, 1998
    Assignee: The Lubrizol Corporation
    Inventors: James H. Bush, Richard W. Jahnke
  • Patent number: 5707546
    Abstract: A method of preparing and storing a stable solution of chlorine dioxide in a non-aqueous, water-immiscible liquid. An aqueous solution of chlorine dioxide is vigorously mixed with a non-aqueous, water immiscible liquid and, in a single extraction, the chlorine dioxide is extracted into the non-aqueous liquid. The aqueous and non-aqueous phases are separated and the chlorine dioxide containing non-aqueous liquid is stored in a closed light-free environment. In an alternate embodiment, gaseous chlorine dioxide is introduced into the non-aqueous, water-immiscible liquid. Concentrations of 2,000 mg to 17,000 mg chlorine dioxide per liter are obtained. The chlorine dioxide in the non-aqueous liquid is stabilized for at least one month. A highly purified aqueous solution of chlorine dioxide is prepared by mixing the non-aqueous solution of chlorine dioxide with water and extracting chlorine dioxide into the water.
    Type: Grant
    Filed: April 4, 1995
    Date of Patent: January 13, 1998
    Assignee: Rio Linda Chemical Co., Inc.
    Inventor: Anthony R. Pitochelli
  • Patent number: 5707939
    Abstract: The present invention relates to an improved continuous phase for a drilling fluid and specifically a silicone continuous phase which is non-polluting and substantially non-toxic. Preferred silicones for use in the invention are dimethylsiloxane polymers. In the drilling fluid compositions, suitable emulsifiers, wetting agents, viscosifiers, weight materials and fluid loss additives may be added in conjunction with water and/or a brine phase for desired rheological properties.
    Type: Grant
    Filed: September 21, 1995
    Date of Patent: January 13, 1998
    Assignee: M-I Drilling Fluids
    Inventor: Arvind D. Patel
  • Patent number: 5696059
    Abstract: Improved methods of cementing in a well are provided whereby stress failures in the resulting set cement are prevented or reduced. The methods basically comprise the steps of placing a foamed cement composition in a zone in the well to be cemented which when set has sufficient elastic properties to resist stress failure comprised of hydraulic cement, water, a gas present in an amount in the range of from about 5% to about 75% by volume of the cement composition and a foaming agent, and then allowing the cement composition to set across the zone.
    Type: Grant
    Filed: January 31, 1996
    Date of Patent: December 9, 1997
    Assignee: Halliburton Company
    Inventors: David D. Onan, James E. Griffith, William W. Webster