For Laboratory Or Pharmaceutical Glassware Patents (Class 510/179)
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Patent number: 9394506Abstract: Compositions and methods for cleaning hard surfaces are disclosed herein. More particularly, the present disclosure relates to cleaning compositions that can be used in automotive applications for removing organic soils that accumulate on automotive surfaces without causing surface paint damage.Type: GrantFiled: February 13, 2015Date of Patent: July 19, 2016Assignee: Prestone Products CorporationInventors: Thomas G. Kalagher, Colin Dilley, Joseph Matthews
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Publication number: 20150099681Abstract: The present invention relates to compositions comprising a plant material and methods for using the same. The methods include extracting or removing a substance from a substrate, or remediating a substrate from a substance. The substance can comprise a hydrocarbon-containing substance, a protein, lipid, wax, fatty acid or fatty alcohol, or a combination thereof.Type: ApplicationFiled: October 13, 2014Publication date: April 9, 2015Applicant: GreenStract, LLCInventor: Peter Rehage
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Patent number: 8969275Abstract: The aqueous alkaline cleaning composition comprising (A) at least one thioamino acid having at least one secondary or tertiary amino group and at least one mercapto group and (B) at least one quaternary ammonium hydroxide; the use of the alkaline cleaning composition for the processing of substrates useful for fabricating electrical and optical devices; and a method for processing substrates useful for fabricating electrical and optical devices making use of the said aqueous alkaline cleaning composition.Type: GrantFiled: June 24, 2010Date of Patent: March 3, 2015Assignee: BASF SEInventors: Raimund Mellies, Andreas Klipp
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Patent number: 8969277Abstract: An object of the invention is to remove effectively metallic contaminants adhering to the glass substrate surfaces without increasing roughness of the glass substrate surfaces in the glass substrate for a magnetic disk. In a manufacturing method of a glass substrate for a magnetic disk having a cleaning step of the glass substrate, the cleaning step comprising a cleaning treatment of contacting the glass substrate with an alkaline aqueous solution having a gluconate in concentration of not less than 0.05 wt % and not more than 2 wt % added thereto and a pH of not less than 9 and not more than 11 is appended.Type: GrantFiled: March 31, 2011Date of Patent: March 3, 2015Assignee: Hoya CorporationInventors: Takuhiro Hirakawa, Yasunari Hirano, Kouichi Tamoto, Tomoyuki Yamaguchi
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Publication number: 20150038389Abstract: Cleaning compositions and methods of making and using the same are provided. The cleaning compositions of the present invention may include at least one alkyl 3-hydroxybutyrate and water, optionally including at least one surfactant and one or more additional additives. The cleaning compositions of the present invention, which are non-toxic and environmentally benign, can be useful to remove many types of soils from a range of different substrates in a variety of domestic, industrial, and/or institutional applications.Type: ApplicationFiled: August 2, 2013Publication date: February 5, 2015Applicant: Eastman Chemical CompanyInventors: Jos Simon De Wit, Mark Stanley Pavlin
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Patent number: 8506723Abstract: An alkaline detergent composition for hard surface comprises an alkaline agent (component A), a nonionic surfactant (component B), a chelating agent (component C), water (component D), at least one carboxylic acid compound (component E) selected from the group consisting of compounds represented by general formula (1) and general formula (2), and at least one anionic surfactant (component F) selected from the group consisting of surfactants represented by general formula (3) and salts thereof. Therein, the content ratio [component E (weight %)/component B (weight %)] is 1/1.5-15/1, the content ratio [component F (weight %)/component B (weight %)] is 10/1-1/5, and the pH at 25° C. is 12 or greater.Type: GrantFiled: December 27, 2010Date of Patent: August 13, 2013Assignee: KAO CorporationInventors: Atsushi Tamura, Sadaharu Miyamoto
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Patent number: 8420584Abstract: A non-toxic enzymatic detergent for use in cleaning surgical instruments and the like which have a large build-up of bio-residue thereon and which need specialty cleaning in order to avoid both hardened bio-residue and certain fluid traces from the instruments for both operating accuracy as well as sterilization requirements.Type: GrantFiled: June 4, 2010Date of Patent: April 16, 2013Inventors: Melton Sherwood Thoele, Alex Ladato
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Publication number: 20120094886Abstract: The aqueous alkaline cleaning composition comprising (A) at least one thioamino acid having at least one secondary or tertiary amino group and at least one mercapto group and (B) at least one quaternary ammonium hydroxide; the use of the alkaline cleaning composition for the processing of substrates useful for fabricating electrical and optical devices; and a method for processing substrates useful for fabricating electrical and optical devices making use of the said aqueous alkaline cleaning composition.Type: ApplicationFiled: June 24, 2010Publication date: April 19, 2012Applicant: BASF SEInventors: Raimund Mellies, Andreas Klipp
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Patent number: 8114223Abstract: A cleaning agent for hard surfaces, which is made of a combination of at least one alkyl pyrrolidone, at least one glycol ether, and at least one anionic surfactant, exhibits very good cleaning power and cleaning speed for dirt of different kinds and can be utilized particularly for cleaning glass.Type: GrantFiled: September 4, 2009Date of Patent: February 14, 2012Assignee: Henkel AG & Co. KGaAInventors: Erik Brueckner, Juergen Noglich, Stefan Karsten
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Patent number: 7879786Abstract: A detergent composition is disclosed, which comprises: (A) an alkali metal hydroxyl compound in an amount of 0.1 to 20 parts by weight; (B) a nonionic surfactant represented by the following formula (I) in an amount of 0.1 to 30 parts by weight: wherein R1 is hydrogen or methyl; R2 is hydrogen or methyl; n is an integer from 0 to 10; and m is an integer from 4 to 20; (C) an anionic surfactant in an amount of 0.1 to 10 parts by weight; (D) a chelating agent in an amount of 0.1 to 20 parts by weight; (E) an additive in an amount of 0.1 to 20 parts by weight; and (F) water of remaining parts based on 100 parts by weight of the detergent composition.Type: GrantFiled: August 24, 2010Date of Patent: February 1, 2011Assignee: Everlight USA, Inc.Inventors: Yung-Hsiang Bai, Yu-Fen Liao, Yi-Jin Chen, Yen-Cheng Li
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Patent number: 7838481Abstract: A formaldehyde-free cleaner composition and method of use for maintaining a blood analyzer are disclosed. The cleaner composition includes surfactants, a proteolytic enzyme, non-formaldehyde releasing antimicrobials, alkaline metal salts, and a buffer. The cleaner composition has a pH in a range from about 7 to about 12 and a formaldehyde concentration equal or less than 1 ppm.Type: GrantFiled: April 7, 2006Date of Patent: November 23, 2010Assignee: Beckman Coulter, Inc.Inventors: Mirta I. Riesgo, Carlos S. Rubio, Susana M. Maldonado
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Patent number: 7741261Abstract: A cleaning composition contains all natural ingredients and is both environmentally safe and hypoallergenic. One embodiment of natural glass cleaner contains white vinegar, natural aloe vera gel, fresh rosemary, filtered water, pure eucalyptus oil, lauryl glucoside, green food color, and a preservative. One embodiment of natural scrub wash multi-purpose cleaner contains lemon juice, fresh rosemary, lauryl glucoside, filtered water, fresh peppermint and a preservative. One embodiment of natural shine furniture cleaner contains lemon juice, extra virgin olive oil, pure orange oil, pure lemon oil, pure eucalyptus oil, filtered water, and a preservative.Type: GrantFiled: June 2, 2009Date of Patent: June 22, 2010Inventor: Ivania Guerrero
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Patent number: 7737106Abstract: A process for making ionic liquids containing ion actives, which provide fabric treating benefits, surface treating benefits and/or air treating benefits. The ionic liquid is made from an ion active feedstock and an ionic liquid forming counterion feedstock, which preferably comprises another ion active.Type: GrantFiled: November 14, 2006Date of Patent: June 15, 2010Assignee: The Procter & Gamble CompanyInventors: Corey James Kenneally, Stacie Ellen Hecht, Scott Leroy Cron
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Publication number: 20100126524Abstract: The disclosure provides mixed acid solutions for cleaning a vessel, such as a vessel used for growing a GaAs crystal, comprising nitric acid, hydrofluoric acid and water. Further, the disclosure also provides exemplary methods for cleaning a vessel for growing a GaAs crystal, by: a) immersing the vessel in a mixed acid solution; b) immersing the vessel in an ammonia solution; c) cleansing the vessel with a surfactant solution under supersonic vibration; and d) cleansing the vessel with deionized water under supersonic vibration.Type: ApplicationFiled: October 19, 2009Publication date: May 27, 2010Inventor: Guoming Fan
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Patent number: 7531490Abstract: The present invention relates to a detergent composition containing (a) 2 to 30% by weight of an inorganic alkali, (b) 0.5 to 20% by weight of at least one surfactant selected from an anionic surfactant and a nonionic surfactant, (c) 0.01 to 2% by weight (based on calcium ion) of a calcium salt, (d) 0.1 to 15% by weight of a calcium ion-sequestering agent, (e) 1 to 30% by weight of a water-soluble organic solvent and (f) 20 to 95% by weight of water.Type: GrantFiled: September 29, 2005Date of Patent: May 12, 2009Assignee: Kao CorporationInventors: Junji Kondo, Yasunori Horio
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Publication number: 20080242576Abstract: A probe cleaning sheet for removing foreign objects attached to tip part of a probe is formed with a plastic sheet having a flat and even surface and a uniform thickness and a cleaning layer with a flat and even surface and a uniform thickness formed on the surface of this plastic sheet. The cleaning layer has viscoelastic properties. Its Young's modulus is 30 MPa or more and 700 MPa les less, its storage modulus at 25° C. is 1.2×108 dyn/cm2 or more and 1.2×109 dyn/cm2 or less, and the value of its storage modulus at 25° C. is 1.2 or more and 3.0 or less times the value of its storage modulus at 150° C.Type: ApplicationFiled: August 3, 2007Publication date: October 2, 2008Inventors: Jun Tamura, Toshihiro Kobayashi, Jun Watanabe
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Patent number: 7258834Abstract: Methods and compositions for modifying a substrate surface are provided. In accordance with the subject methods, a substrate surface is contacted with a particulate-containing fluid. The fluid is then ultrasonically or sonically agitated to modify the substrate surface. In certain embodiments, the particulate-containing fluid has a pH above the isoelectric point of the substrate. Also provided are devices capable of providing ultrasonic and/or sonic energy and which include a non-acidic, particulate-containing fluid. The subject invention also provides systems and kits for use in practicing the subject methods.Type: GrantFiled: August 1, 2003Date of Patent: August 21, 2007Assignee: Agilent Technologies, Inc.Inventors: John F. McEntee, Michel G. M. Perbost, Joseph Vandenburg
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Patent number: 7211552Abstract: A non-toxic enzymatic detergent for use in cleaning surgical instruments and the like which have a large build-up of bio-residue thereon and which need specialty cleaning in order to avoid both hardened bio-residue and certain fluid traces from the instruments for both operating accuracy as well as sterilization requirements.Type: GrantFiled: March 31, 2004Date of Patent: May 1, 2007Inventor: Melton Sherwood Thoele
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Patent number: 6984612Abstract: An automotive headlight restorer and cleaner which removes oxidation and yellow haziness and restores optical clarity. The method of manufacture consists of several solutions. Solution A, which is an industrial degreasing compound, diluted to 1:20. Solution B1 is a mixture of 53%–56% mineral spirits, 1%–3% butanol, and gloss spar varnish and/or acrylic urethane. Solution B1 is used on lenses with heavy oxidation and severe damage. It will improve them greatly, but not restore them to like new clarity. Solutions B2 and C are for lenses with less severe oxidation and damage (the majority of lenses fit in this category.) Solution B2 is a fine cut cleaner (a professional quality rubbing compound of low abrasive content with diminishing abrasiveness). Solution C is a combination wax, polish, sealer. This solution protects against future damage to the lenses.Type: GrantFiled: February 5, 2004Date of Patent: January 10, 2006Inventor: David Francis Maillie
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Patent number: 6946432Abstract: The anti-foaming preparations comprise aqueous formulations, which contain at least one substance, from the group of polyhydroxy compounds, non-ionic detergents and phosphoric acid esters and their salts, preferably alkyl polygluocosides, alkoxylated long-chain alcohols and an alkali salt of a phosphoric acid partial-ester. The particular advantage of said aqueous formulations is that they are stable when included in highly alkaline cleaning concentrates.Type: GrantFiled: November 30, 2000Date of Patent: September 20, 2005Assignee: Ecolab GmbH & Co. OHGInventors: Siegfried Bragulla, Peter Schwarz
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Patent number: 6939836Abstract: The invention relates to an aqueous composition comprising in combination an alkyl pyrrolidone, such as a C8-C18 linear alkyl pyrrolidone, and an alkyl polysaccharide such as an alkyl polyglucoside, and a method of .enhancing the efficacy of an enzyme containing composition for use in cleaning medical instruments comprising the step of including in said composition an alkyl pyrrolidone and an alkyl polysaccharide. The methods and compositions of the present invention may further include at least one enzyme such as proteases, lipases, amylases, and cellulases.Type: GrantFiled: February 27, 2003Date of Patent: September 6, 2005Assignee: Novapharm Research (Australia) Pty LtdInventors: Steven Kritzler, Alex Sava
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Patent number: 6881711Abstract: The present invention relates generally to compositions and methods for cleaning hard surfaces. More particularly, the present invention relates to cleaning compositions which can be used in automotive applications for removing organic soils that accumulate on automotive surfaces without causing surface paint damage. Such cleaning compositions of the present invention are environmentally safe and contain no or low amounts of volatile organic compounds.Type: GrantFiled: October 26, 2001Date of Patent: April 19, 2005Assignee: Prestone Products CorporationInventors: Aleksei V. Gershun, Mark V. Alexander, Colin M. Dilley
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Publication number: 20030073071Abstract: Measurements relating to the activity of various molecules of interest are obtained using a sensing surface with an associated first charge, a charge-regulating layer bound to the sensing surface, various possible probe molecules and a measurement circuit. The sensing surface has a layer bound to it that confers a neutral charge or a second charge on a net basis. In addition, a probe is bound to at least one of the surface and the layer, the probe being complementary to and interacting with a molecule of interest. The interaction between the probe and the molecule of interest is detected electrically.Type: ApplicationFiled: July 23, 2002Publication date: April 17, 2003Inventors: Jurgen Fritz, Emily Cooper, Scott Manalis
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Publication number: 20020183220Abstract: The present invention is directed to the discovery that addition of a specific combination of components can significantly reduce the adverse impact of the caustic wash solution on the bottle surface of bottles being washed for reuse without compromising the cleaning activity of the wash solutions. It was discovered that the addition of a combination of a polycarboxylic acid and a phosphonic acid to a caustic wash solution significantly decreases the weight loss observed in glass bottles being subjected to a caustic wash procedure.Type: ApplicationFiled: April 23, 2001Publication date: December 5, 2002Inventors: Francesco Falsina, William G. Cleuren
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Patent number: 6420326Abstract: The present invention relates to an aqueous, liquid hard surface detergent composition having excellent surface lubricity and filming/streaking characteristics. Said composition comprises less than about 1%, by weight of the composition, of surfactant to provide lubricity, preferably straight chain alkyl sulfate wherein at least about 30%, preferably wherein more than about 50%, of said surfactant, by weight, has a C12 or C14 chain length or mixtures thereof; hydrophobic cleaning solvent; an optional substantive material that increases the hydrophilicity of the glass; and preferred low level of alkaline buffering agent to provide composition stability on storage and alkalinity, without diminishing the lubricity.Type: GrantFiled: February 11, 2000Date of Patent: July 16, 2002Assignee: The Procter & Gamble CompanyInventors: Michael Stephen Maile, Alan Edward Sherry
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Patent number: 6367487Abstract: A novel anti-etch and cleaning solution is described. The solution comprises a hetero functionalized polymer, caustic and optionally, an anti-etch component and unexpectedly results in glassware that is substantially free of contaminants and etching after washing.Type: GrantFiled: August 11, 1999Date of Patent: April 9, 2002Assignee: Diversey Lever, Inc.Inventors: Carol Anne Rouillard, Charles Allen Crawford, David Cole, Michael Howell
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Patent number: 6299701Abstract: A detergent composition containing alkali-metal silicate with an average molar ratio of SiO2/M2O of 1-4.2, preferably 2.5-4.2, wherein M is an alkali metal, the composition being non-corrosive to glass, crystal, porcelain and decorative prints thereon upon repeated washing. The composition being such that when disposed in a washing medium at a normal working concentration, a protonated silicic monomer Si(OH)4 is produced in a concentration of at least 2.5×10−3 mol/liter of the washing medium.Type: GrantFiled: March 17, 1999Date of Patent: October 9, 2001Assignee: Rhone-Poulenc ChimieInventors: Eric Aubay, Agnès Froute, Aude Guirauden, Daniel Joubert
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Patent number: 6281178Abstract: Disclosed are aqueous hard surface cleaning compositions comprising detergent surfactant and, optionally, detergent builder and a hydrotrope in an amount sufficient to prevent filming and/or streaking after a surface is cleaned with the compostions.Type: GrantFiled: October 1, 1999Date of Patent: August 28, 2001Assignee: Stepan CompanyInventors: Irma Ryklin, Arshad Malik
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Patent number: 6232280Abstract: A cleaning composition includes a detectable substance which is relatively stable in the cleaning composition, for indicating whether the cleaning composition has been thoroughly removed from a vessel following a cleaning process. For pharmaceutical applications, the detectable substance is preferably a low-foaming surfactant that is detectable by high performance liquid chromatography at concentrations of around 10 ppm, or less. The surfactant is thus detectable in the same analytical procedure as are traces of pharmaceutical residues which have not been removed from the vessel. The analytical procedure is used to develop a cleaning protocol for future cleaning processes by determining the number of rinses needed for reducing the surfactant, and hence the cleaning product, and also the pharmaceutical residues, in the rinse water to predetermined acceptable levels.Type: GrantFiled: May 12, 1999Date of Patent: May 15, 2001Assignee: Steris CorporationInventors: Sayed Sadiq Shah, Herb J. Kaiser, Shahin Keller
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Patent number: 6169066Abstract: Waterborne hydrophobic cleaning and coating compositions of this invention are prepared by combining one or more silicone ingredient, with water, and at least one solubilizing agent capable of making the silicone ingredient miscible in water to form a homogeneous mixture. Optionally, cleaning and costing compositions of this invention can include volatilizing agents, to reduce application time, and colorizing agents, to provide a desired composition color. The silicone ingredient can be selected from the group of silicone resins, silicone oils, and mixtures thereof. Preferably, the silicone ingredient comprises a functional group that is capable of forming a bond with a chemical group of the underlying substrate. Preferably, the solubilizing agent is one that is selected from the group consisting of organic solvents, alcohols, ketones, acetates, ethers, esters, aromatics, and mixtures thereof that are soluble in water and that are capable of cleaning a substrate surface.Type: GrantFiled: November 17, 1998Date of Patent: January 2, 2001Assignee: Ameron International CorporationInventor: Roland L. Gasmena
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Patent number: 6130197Abstract: A hard surface cleaner comprises (a) one or more alkyl or alkenol ethoxylated amides, (b) a glycol ether or a C.sub.6 -C.sub.11 alcohols, and (c) optionally, an anti-static agent.Type: GrantFiled: April 30, 1999Date of Patent: October 10, 2000Assignee: Reckitt & Colman Products LimitedInventors: David Bedford, Susan Wigley
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Patent number: 6042749Abstract: A mixed solvent composition comprising dichloropentafluoropropane and at least one component selected from the group consisting of 1,1,1,2,3,4,4,5,5,5-decafluoropentane and perfluorohexane as the essential components, or a mixed solvent composition comprising dichloropentafluoropropane, an alcohol and at least one component selected from the group consisting of 1,1,1,2,3,4,4,5,5,5-decafluoropentane and perfluorohexane.Type: GrantFiled: June 5, 1998Date of Patent: March 28, 2000Assignee: AG Technology Co., Ltd.Inventors: Kenroh Kitamura, Michino Ikehata, Masaaki Tsuzaki
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Patent number: 5954891Abstract: A detergent composition for removing resinous stains including (a) an aromatic compound represented by the general formula (1); and (b) an alkylene oxide compound represented by the general formula (2); and optionally including (c) an alkali metal hydroxide; and (d) water.Type: GrantFiled: January 8, 1998Date of Patent: September 21, 1999Assignee: Kao CorporationInventors: Junji Kondoh, Eiji Kashihara
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Patent number: 5942481Abstract: The caustic cleaner of the present invention has a freezing point of no more than about 40.degree. F. The caustic cleaner is a mixture of aqueous sodium hydroxide and an organic salt derived from the reaction of sodium hydroxide and gluconic acid at elevated temperatures.Type: GrantFiled: June 12, 1997Date of Patent: August 24, 1999Assignee: Charvid Limited Liability Co.Inventor: Charles Bullick Talley
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Patent number: 5858941Abstract: The invention is a method of removing soils containing oils and fats from food processing surfaces. The method includes the steps of formulating a wash composition from a two-part concentrate. The concentrate first part includes a source of alkalinity and water. The concentrate second part includes a quaternary ammonium compound. After formulation, the wash composition has a major portion of water, from about 100 ppm to 20,000 ppm of quaternary ammonium compound, and an alkali source present in a concentration to provide a pH of from about 10 to 14. After formulation, the wash composition may be used by applying it to the food processing surface. Optionally, the wash composition may also include a chelating agent and a second nonionic or anionic detersive agent.Type: GrantFiled: May 12, 1997Date of Patent: January 12, 1999Assignee: Ecolab Inc.Inventors: Thomas R. Oakes, Timothy A. Gutzmann, Cynthia Lee Ross, Bruce E. Schmidt
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Patent number: 5849095Abstract: Chemical etching of bottles in a bottle washer is minimized by soaking the bottles in a highly caustic composition which does not include any phosphorus compounds, ethylene diamine tetraacetic acid or nitrilotriacetic acid. The soaking composition includes the sodium hydroxide dissolved in water, in combination with polycarboxylic acid crystal growth inhibitors. Preferably, the soaking solution further includes a nonionic surfactant such as an alkyl polyglucoside, as well as a chelant such as a gluconate, glucoheptonate, or boroheptonate. The soaking solution can be added by either combining a liquid or powder built detergent composition which also forms a portion of the present invention or, alternately, an additive package, not including the sodium hydroxide, can be added. These compositions effectively clean the bottles and significantly reduce the dissolution of the glass which can, in turn, cause a hazing and weight loss.Type: GrantFiled: April 11, 1997Date of Patent: December 15, 1998Inventor: Carol Rouillard
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Patent number: 5827454Abstract: A mixed solvent composition, for cleaning electronic components, which consists essentially of dichloropentafluoropropane and 1,1,1,2,3,4,4,5,5,5-decafluoropentane.Type: GrantFiled: January 18, 1996Date of Patent: October 27, 1998Assignee: AG Technology Co., Ltd.Inventors: Kitamura Kenroh, Ikehata Michino, Tsuzaki Masaaki
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Patent number: 5804541Abstract: A floor stripper composition is provided, having a pH-value above 9.0, and comprising a soap, water and a glycine-N,N-diacetic acid compound, which is preferably methylglycine diacetic acid (MGDA). The diacetic acid is desirably in the form of a divalent metal complex thereof. A process is also provided for removing a zinc containing acrylate polymer film from a floor surface, wherein a floor stripper composition of the invention is applied. A good floor stripper performance could be obtained with this composition owing to its low foaming behaviour.Type: GrantFiled: June 19, 1997Date of Patent: September 8, 1998Assignee: Diversey Lever, Inc.Inventor: Josef Jans
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Patent number: 5789252Abstract: A body fluid sample and a reagent are reacted in a reaction container, and after measuring the reaction solution the reaction solution is discharged from the reaction container. The vacant reaction container is washed by charging a detergent solution containing plural kinds of surface active agents through a nozzle of a washing mechanism. The detergent solution is a mixed solution containing polyoxyethylene alkyl ether, polyoxyethylene polyoxypropylene glycol ether, N-acyl amino acid salt and polyacrylic salt. By the washing method in accordance with the present invention, it is possible to eliminate bad effects due to incomplete washing of reaction containers in an apparatus for automatically successively analyzing biological samples.Type: GrantFiled: October 17, 1996Date of Patent: August 4, 1998Assignees: Hitachi, Ltd., Hitachi Instruments Engineering Co., Ltd.Inventors: Hiroko Fujita, Mitsuo Hattori, Emi Murakami, Yasuhisa Shibata
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Patent number: 5759618Abstract: A coating composition of an alkoxy silane reacted with the surface of a glass substrate and a cleaning composition and method for cleaning said glass area is disclosed. The coating provides water repellency, durability and ease of cleaning to a glass or other siliceous surface. The coating is formed by applying an excess of an alkoxy solution containing a sulfuric acid to a glass surface with an excess of solution being applied. Preparatory to such coating application, the glass, especially if its surface is a weathered (non-virgin) surface, is cleaned vigorously with a cleaning solution containing water, phosphoric acid, hydrofluoric acid and sulfuric acid.Type: GrantFiled: February 27, 1997Date of Patent: June 2, 1998Assignee: Diamond Seal, Inc.Inventor: George S. Taylor