Patents Examined by LaToya I. Cross
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Patent number: 6524859Abstract: A process for marking a textile product by means of an invisible substance whose presence in the textile product is detectable by conventional detection methods of analytical chemistry, wherein the substance for marking the textile product is so selected as to be suitable for extraction from the textile product and detection through application of an absorbent probe.Type: GrantFiled: April 4, 2000Date of Patent: February 25, 2003Assignee: Madeira Garnfabrik Rudolf Schmidt KGInventors: Werner Heese, Martin Lohe
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Patent number: 6503420Abstract: Anti-corrosion solutions useful for air dehumidification processes are disclosed. Phosphonate corrosion inhibiting agents or mixtures thereof can be added to halide solutions of alkali metals, alkaline earth metals, or mixtures thereof, to minimize corrosion of the dehumidifier system.Type: GrantFiled: July 28, 1999Date of Patent: January 7, 2003Assignee: FMC CorporationInventor: Shyam Kumar Verma
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Patent number: 6503411Abstract: In a composition which has an amorphous, undercooled, glassy phase containing a water-soluble or water-swellable substance in an amorphous form, a sugar, which is capable of existing as a crystalline hydrate, is used as an agent to dehydrate the amorphous phase by crystallisation therefrom, and thereby enhance the glass transition temperature of the residual amorphous phase.Type: GrantFiled: May 22, 2000Date of Patent: January 7, 2003Assignee: Inhale Therapeutic Systems, Inc.Inventors: Felix Franks, Barry John Aldous, Anthony Auffret
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Patent number: 6492305Abstract: Selectively cross-linked starches are disclosed that are useful as fluid loss control additives in subterranean treatment fluids comprising starches that cross-linked to a Brabender peak viscosity of about 800 to about 1250 Brabender units after about 40 to about 70 minutes at about 92° C. and provide good fluid loss control over a temperature range of from about 20° C. to about 160° C. (68° F. to 320° F.).Type: GrantFiled: January 24, 2001Date of Patent: December 10, 2002Assignees: CP Kelco U.S., Inc., National Starch and Chemical Investment Holding CorporationInventors: Thomas R. Sifferman, John M. Swazey, C. Bryan Skaggs, Nina Nguyen, Daniel B. Solarek
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Patent number: 6454968Abstract: Flammable organic material is made less flammable by incorporating a polynitrogen containing salt of polyboron oxyacid in or on the material. The polynitrogen containing salt of polyboron oxyacid is produced by reacting a boron oxyacid or salt of boron oxyadd with a nitrogen containing salt forming compound such as ammonia, amino compounds and amines in water. Both the polynitrogen radical and the boron oxyacid radical are both flame retardant agents. The polynitrogen salt of boron oxyacids may be used to form a flame retardant compositions by mixing it with carbonization auxiliaries and fillers. The polyammoniun alkali metal salts of polyboron oxyacids are useful as flame retardant agents and as a surfactant.Type: GrantFiled: October 20, 2000Date of Patent: September 24, 2002Inventor: David H. Blount
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Patent number: 6420319Abstract: A process and composition are provided for permeability reduction in a hydrocarbon-bearing formation to improve hydrocarbon recovery therefrom. A moderately epichlorohydrin cross-linked, non-hydroxylpropylated starch is derived from high amylopectin waxy maize starch for use in drilling, workover and completion fluids. The starch is combined with xanthan gum and used in solutions of fresh water, non-saturated brine or saturated brine containing sized salt particles, typically sodium chloride, of various sizes, or sized calcium carbonate, or a combination of sized salt and sized calcium carbonate.Type: GrantFiled: August 9, 2000Date of Patent: July 16, 2002Assignee: Halliburton Energy Services, Inc.Inventors: Brent L. Estes, Cory J. Bernu
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Patent number: 6391646Abstract: An electron paramagnetic resonance spectroscopic method for quantifying molecular oxygen and its isotopes in a sample and an electron paramagnetic resonance spectrometric cell for use in this method are provided.Type: GrantFiled: January 29, 1999Date of Patent: May 21, 2002Inventor: Sergi V. Khangulov
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Patent number: 6379620Abstract: An assay device for in field urine analysis including a container having an opening for collecting a urine sample, a cover for sealing the opening of the container and an assay assembly provided in the container for chemically analyzing the urine sample. The assay assembly comprises a liquid impermeable backing, a wicking material provided on a rear surface of the backing, at least one assay strip provided on a front surface of the backing and adjacent a top edge of the backing in contact with the wicking material, a front cover provided on the front surface of the backing for sealing the assay strip to the backing at a bottom and two sides of the assay strip and a rear cover provided on the rear surface of the backing for together with the front cover sealing said wicking material and the assay strip adjacent the top edge and two sides of said wicking material.Type: GrantFiled: November 16, 1998Date of Patent: April 30, 2002Inventors: Barry M. Tydings, James P. Lee
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Patent number: 6368870Abstract: A method is described for determining the presence of a volatile component in a test sample. The method involves use of two separate vessels, one of which is capable of being placed wholly within the other vessel. The test sample is placed in the larger vessel, and an indicator solution is placed in the smaller, inner vessel. Then a gas-tight closure is placed on the top of the outer, larger vessel. The assembly is heated to an elevated temperature, whereby the volatile target analyte which is released from the test sample transfers to the inner vessel and is absorbed by the indicator solution. The indicator solution can be analyzed by means of a calorimeter, spectrophotometer, etc.Type: GrantFiled: June 4, 1999Date of Patent: April 9, 2002Assignee: Hach CompanyInventor: Danial L. Harp
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Patent number: 6348355Abstract: A testing elements for the calorimetric determination of oxidizable gas and/or vapor components in gas mixtures is provided. The testing element contains, besides usual oxidizing agents, at least one redox indicator, which is in the oxidized form. The redox indicator is preferably a benzidine derivative according to the general formula in which the radicals R are identical or different and denote a hydrogen, alkyl, aryl, halogen, trifluoromethyl, cyano, nitro, dialkylamino, ester, sulfoxyl ester, alkyloxy or aryloxy, X denotes a halogen, Y denotes a trifluoromethyl, cyano, nitro, dialkylamino, ester, sulfoxyl ester, alkyloxy or aryloxy, n is an integer from zero to three, and m equals 5−n. The testing elements are preferably designed as detector tubes that contain carrier materials, to which the oxidizing reagents and redox indicators are applied.Type: GrantFiled: September 28, 1999Date of Patent: February 19, 2002Assignee: Dräger Sicherheitstechnik GmbHInventors: Wolfgang Bäther, Ralf Miethchen, Alexej Miller
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Patent number: 6333197Abstract: A method for fractionated distribution of a blood sample, includes the steps of: a) drawing up a blood sample into a needle; b) distributing via the needle an aliquot corresponding to a specific fraction of the blood sample drawn up, into a flow of a reagent, to thereby produce a mixture of the aliquot and of the reagent; c) collecting the mixture in a mixing and/or measuring receptacle; and d) repeating steps b) and c) at least once to distribute a further aliquot corresponding to a further specific fraction of the blood sample, into a further flow of reagent.Type: GrantFiled: October 13, 1998Date of Patent: December 25, 2001Assignee: A B XInventors: Roger Le Comte, Henri Champseix
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Patent number: 6329207Abstract: A wet chemical indicator for peracetic acid solutions includes an indicator for peracetic acid and an inhibitor. The inhibitor is selected to inhibit a selected peracetic acid concentration in a reproducible sample of a solution containing peracetic acid. The indicator exhibits an observable change when the selected concentration of peracetic acid is exceeded. In this manner, a rapid indication of whether the peracetic acid solution is of a required minimum strength is provided.Type: GrantFiled: February 11, 1999Date of Patent: December 11, 2001Assignee: Steris CorporationInventors: Christopher M. Fricker, Brian C. Wojcieck, Paul D. Walkley, Jr., Robert F. Korb, Giridhar Shamsunder, Elijah L. Booker, Jr., Kathleen A. Hughes, Lewis I. Schwartz
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Patent number: 6322726Abstract: This invention comprises a concentrate further comprising a salt(s), a rheological modifier(s), an effective amount of a stabilizing compound selected from the group consisting of aliphatic carboxylic acids optionally substituted with one or more hydroxyl groups, aliphatic polycarboxylic acids optionally substituted with one or more hydroxyl groups, aliphatic and alicyclic organic compounds having at least three hydroxyl groups, glycols, mixtures thereof and the like and water which is present in an amount at least sufficient to solubilize the stabilizing compound(s) up to an amount at which said thickening compound is activated. This composition, upon dilution, after aging has the viscosity development characteristic(s) of a freshly diluted concentrate. If desired, this concentrate further comprises performance additives and other components and is preferably formulated for use in preparing a fire retardant concentrate.Type: GrantFiled: February 24, 1999Date of Patent: November 27, 2001Assignee: Astaris, LLCInventors: Howard L. Vandersall, Gary H. Kegeler
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Patent number: 6315921Abstract: An iron-based oxygen scavenging packet is set forth in which the rate of uptake of oxygen is increased by virtue of the presence of an oxygen uptake accelerator such as water which is introduced into the packet. Methods of increasing the rate of oxygen absorption by the iron-based oxygen scavenging packet are also set forth.Type: GrantFiled: July 2, 1999Date of Patent: November 13, 2001Assignee: Pactiv CorporationInventors: Gary R. DelDuca, Alan E. Deyo, Vinod K. Luthra, Wen P. Wu
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Patent number: 6309599Abstract: This invention relates to an apparatus for determining a given substance content of a fluid comprising a means for monitoring the fluid volume passing through the tube, and a heat sensitive indicator for indicating that the reactant mass has reached a critical heating temperature corresponding to a fluid volume flowing through the mass equal to a predetermined calibrated volume.Type: GrantFiled: August 11, 1998Date of Patent: October 30, 2001Assignee: Metrologie et Systemes Industriels de Regulation (M.E.S.I.R. S.A.)Inventor: Renaud Saint Gal de Pons
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Patent number: 6309885Abstract: The invention relates to a method for preparing blood samples for detecting homocysteine and/or total folate and is characterized in that the blood sample is brought into contact with (a) at least one reagent for lysis of the blood cells, (b) at lease one inhibitor of the enzymes which produce and break down homocysteine, and optionally (c) at least one acid.Type: GrantFiled: September 24, 1999Date of Patent: October 30, 2001Assignee: Reinee ProbstInventors: Reiner Probst, Matthias Blümke
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Patent number: 6303544Abstract: A modified cellulose product comprising cellulose ether, such as carboxymethyl cellulose, hydroxyethyl cellullose, carboxymethyl hydroxyethyl cellulose, methyl cellulose, hydroxyethyl methyl cellulose or ethyl hydroxyethyl cellulose, or xanthan gum product, characterized in that it further comprises salts of aluminium-, ferro-, ferri-, zinc-, nickel-, tin(2)- or tin(4)-cations, and nitrilo-tri-acetic acid, 1,2-cyclo-hexan-di-amin-N,N,N′,N′-tetra-acetic acid, di-ethylen-tri-amine-penta-acetic acid, ethylen-di-oxy-bis(ethylen-nitrilo)-tetra-acetic acid, (N-(2-hydroxy-ethyl)-ethylen-diamin-N, N′,N′,tri-acetic acid, tri-ethylen-tetra-amine-hexa-acetic acid or N-(hydroxyethyl) ethylene-di-amine-tri-acetic acid as a ligand. The product can be used especially as a drilling mud additive.Type: GrantFiled: September 13, 1999Date of Patent: October 16, 2001Assignee: Metsa Specialty Chemicals OYInventors: Antonius Franciscus Maas, Goeran Einar Kloow, Oliver Ruppert
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Patent number: 6299836Abstract: Corrosion in aqueous alkanolamine, physical solvents, or combination of alkanolamine and physical solvent solutions used to remove acid gases from natural gas, synthetic gas, or light hydrocarbon streams can be reduced by addition of mixtures of oxygen scavengers or mixtures of oxygen scavengers and sodium molybdate. The oxygen scavengers must be promoted to reduce metal surfaces in contact with the solutions to a more passive, harder, and insoluble form at the operating temperature of the treating system. The sodium molybdate provides additional passivation especially in the imperfections on the surface of the metal where corrosion accelerates.Type: GrantFiled: October 14, 1998Date of Patent: October 9, 2001Assignee: Coastal Chemical Co., L.L.C. (A Louisiana limited liability company)Inventors: Ray R. Veldman, David O. Trahan
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Patent number: 6294390Abstract: Compounds, constructed in modular manner, of formula (I), wherein I is the monovalent residue of an ionophore, F is the monovalent residue of a fluorophore, G is a functional group, T is a trivalent organic radical and R01, R02 and R03 are each independently of the others a direct bond or a bridging group. The compounds may be used in immobilized form as active components in polymer membranes of optical sensors for the detection of ions. The sensors are distinguished by a long usable life and a high degree of sensitivity.Type: GrantFiled: January 21, 1999Date of Patent: September 25, 2001Assignee: Novartis AgInventors: Steven Mark Barnard, René Beerli, Joseph Berger, David Reinhoudt, Adrian Waldner
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Patent number: 6294387Abstract: A method for determining corrosiveness of naphthenic acid in a fluid includes the steps of: providing a fluid containing naphthenic acid; providing iron powder having a surface area of at least about 0.01 m2/g; contacting the fluid and the powder for a period of time so as to provide a portion of the iron as dissolved iron dissolved in the fluid; and measuring iron concentration of the fluid containing the dissolved iron, so as to provide a measure of corrosion potential of the naphthenic acid over the period of time.Type: GrantFiled: March 24, 1999Date of Patent: September 25, 2001Assignee: Intevep, S.A.Inventors: Omar Yepez, Jose Vera