Patents by Inventor Alan P. Croft
Alan P. Croft 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).
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Patent number: 8282878Abstract: Embodiments of the present invention disclosed herein include a sintering aid composition that has a material useful for sintering, an amine, and optionally a carboxylic acid.Type: GrantFiled: January 27, 2011Date of Patent: October 9, 2012Assignee: Huntsman Petrochemical LLCInventors: Alan P. Croft, David C. Lewis
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Publication number: 20110124482Abstract: Embodiments of the present invention disclosed herein include a sintering aid composition that has a material useful for sintering, an amine, and optionally a carboxylic acid.Type: ApplicationFiled: January 27, 2011Publication date: May 26, 2011Applicant: Huntsman Petrochemical LLCInventors: Alan P. Croft, David C. Lewis
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Publication number: 20090206526Abstract: Embodiments of the present invention disclosed herein include a sintering aid composition that has a material useful for sintering, an amine, and optionally a carboxylic acid.Type: ApplicationFiled: February 12, 2009Publication date: August 20, 2009Applicant: Huntsman Petrochemical CorporationInventors: Alan P. Croft, David C. Lewis
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Patent number: 6451164Abstract: A process for de-watering lime mud in a Krafft pulping process is described. The process includes an improvement which comprises adding an effective water-removal rate enhancing amount of an alkyleneamine to the lime mud prior to filtration. The preferred alkyleneamine is ethyleneamine, that is, an amine having at least one —(CR2—CR2—NH—)— unit wherein each R is independently is H or an alkyl (straight-chain, branched, or cyclic) group of from about 1 to about 10 carbon atoms. Ethyleneamines include ethylenediamine, diethylenetriamine, triethylenediamine, triethylenetetramine, tetraethylenepentamine, piperazine, aminoethylpiperazine, and ethyleneamine mixtures such as mixtures of ethyleneamine oligomers having an average molecular weight of about 200-500.Type: GrantFiled: September 25, 2001Date of Patent: September 17, 2002Assignee: Huntsman Ethyleneamines LimitedInventor: Alan P. Croft
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Patent number: 6441240Abstract: Ethyleneamine compound(s), or mixtures thereof, are used in effective amounts to reduce or inhibit the deposition of white pitch on the paper making equipment during the processing to recycle coated paper.Type: GrantFiled: September 20, 2000Date of Patent: August 27, 2002Assignee: Huntsman Ethyleneamines Ltd.Inventor: Alan P. Croft
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Publication number: 20020096271Abstract: A process for de-watering lime mud in a Krafft pulping process is described. The process includes an improvement which comprises adding an effective water-removal rate enhancing amount of an alkyleneamine to the lime mud prior to filtration. The preferred alkyleneamine is ethyleneamine, that is, an amine having at least one —(CR2-CR2-NH—)— unit wherein each R is independently is H or an alkyl (straight-chain, branched, or cyclic) group of from about 1 to about 10 carbon atoms. Ethyleneamines include ethylenediamine, diethylenetriamine, triethylenediamine, triethylenetetramine, tetraethylenepentamine, piperazine, aminoethylpiperazine, and ethyleneamine mixtures such as mixtures of ethyleneamine oligomers having an average molecular weight of about 200-500.Type: ApplicationFiled: September 25, 2001Publication date: July 25, 2002Inventor: Alan P. Croft
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Patent number: 6312560Abstract: A process for dewatering lime mud in a kraft pulping process is described. The process includes an improvement which comprises adding an effective amount of an alkyleneamine to the lime mud prior to filtration. The preferred alkyleneamine is ethyleneamine, that is, an amine having at least one —(CR2—CR2—NH—)— unit wherein each R independently is H or an alkyl (straight, branched or cyclic) group of from about 1 to about 10 carbon atoms. Ethyleneamines include ethylenediamine, diethylenetriamine, triethylenediamine, triethylenetetramine, tetraethylenepentamine, piperazine, aminoethylpiperazine, and ethyleneamine mixtures such as mixtures of ethyleneamine oligomers having an average molecular weight of about 200-500.Type: GrantFiled: July 23, 1999Date of Patent: November 6, 2001Assignee: Huntsman Ethyleneamines Ltd.Inventor: Alan P. Croft
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Patent number: 6153049Abstract: Ethyleneamine compound(s), or mixtures thereof, are used in effective amounts to reduce or inhibit the deposition of white pitch on the paper making equipment during the processing to recycle coated paper.Type: GrantFiled: March 25, 1998Date of Patent: November 28, 2000Assignee: The Dow Chemical CompanyInventor: Alan P. Croft
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Patent number: 5641385Abstract: Ethyleneamines are used in washing pulp to remove lignin. A process for washing a cellulose pulp mixture containing lignin to remove at least a portion of the lignin therefrom comprises use of a washing composition with at least about 100 ppm of an ethyleneamine. The process includes an improvement in a washing process a cellulose pulp mixture containing lignin wherein a washing composition is used to remove at least a portion of the lignin, the improvement comprising use of at least about 100 ppm of an ethyleneamine with the washing composition and/or using an amount of ethyleneamine at least equivalent to about 100 ppm based on the washing composition with the washing composition. The washing composition is also novel and includes a washing composition for washing kraft pulp comprising water and at least about 100 ppm of an ethyleneamine.Type: GrantFiled: January 17, 1995Date of Patent: June 24, 1997Assignee: The Dow Chemical CompanyInventors: Alan P. Croft, Byford D. Sheffield
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Patent number: 5300324Abstract: The drying rate of glazes containing water used to coat ceramic articles is increased by addition of aminoethylethanolamine, one or more polyalkylene polyamines with or without a small amount of a styrene-butadiene latex.Type: GrantFiled: May 29, 1992Date of Patent: April 5, 1994Assignee: The Dow Chemical CompanyInventors: Alan P. Croft, Byford D. Sheffield
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Patent number: 5205971Abstract: Non-whiteware ceramic articles having an increased green strength are prepared from slip compositions containing a polyalkylene polyamine as an additive or a mixture of a polyalkylene polyamine and binder as an additive. An example of such an additive is tetraethylenepentamine or a mixture of tetraethylenepentamine and a styrene butadiene latex.Type: GrantFiled: October 2, 1990Date of Patent: April 27, 1993Assignee: The Dow Chemical CompanyInventors: Alan P. Croft, Brian D. Koblinski
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Patent number: 5151130Abstract: A method for reducing the consistency of a water and gypsum stucco slurry comprising admixing water, stucco, and an additive, the additive in an amount effective to reduce the consistency of the admixed slurry as compared to a slurry containing only water and stucco, and the additive selected from the group consisting of one or more polyalkylene polyamines having a molecular weight below 1,000.Type: GrantFiled: January 23, 1991Date of Patent: September 29, 1992Assignee: The Dow Chemical CompanyInventors: Alan P. Croft, Brian D. Koblinski
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Patent number: 5145624Abstract: A process for the preparation of whiteware ceramic articles employs an alkylenediamine, such as ethylenediamine, as an additive to increase the green strength of articles prepared by pressing. Optionally, the additive includes a latex such as a styrene butadiene latex in an amount effective to further improve the green strength of the articles prepared.Type: GrantFiled: August 7, 1989Date of Patent: September 8, 1992Assignee: The Dow Chemical CompanyInventor: Alan P. Croft
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Patent number: 5057467Abstract: The filtration rate and viscosity of a clay slurry is improved by the addition of a polyalkylene polyamine and, optionally, a latex. The additive is particularly useful in clay beneficiation.Type: GrantFiled: November 8, 1989Date of Patent: October 15, 1991Assignee: The Dow Chemical CompanyInventor: Alan P. Croft
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Patent number: 5034448Abstract: A casting process for the preparation of whiteware ceramic articles employs a polyalkylene polyamine, such as tetraethylene pentamine, as an additive to increase the casting rate. The additive can be employed, e.g., in slip casting, vacuum casting and pressure casting. Optionally, the additive includes a binder such as a styrene butadiene latex in an amount effective to maintain the green strength of the articles prepared in the casting process.Type: GrantFiled: March 28, 1990Date of Patent: July 23, 1991Assignee: The Dow Chemical CompanyInventors: Brian D. Koblinski, Alan P. Croft, Alfredo C. Tamez
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Patent number: 4915890Abstract: A casting process for the preparation of whiteware ceramic articles employs a polyalkylene polyamine, such as tetraethylene pentamine, as an additive to increase the casting rate. The additive can be employed, e.g., in slip casting, vacuum casting and pressure casting. Optionally, the addtive includes a binder such as a styrene butadiene latex in an amount effective to maintain the green strength of the articles prepared in the casting process.Type: GrantFiled: June 1, 1988Date of Patent: April 10, 1990Assignee: The Dow Chemical CompanyInventors: Brian D. Koblinski, Alfredo C. Tamez, Alan P. Croft
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Patent number: 4795816Abstract: This invention relates to a new composition of matter known as 2-Methyl-4-benzyl-5-oxazolidinone and a method of preparation of the new composition comprising combining ethyl acetate and the azlactone of .alpha.-acetoaminocinnamic acid in the presence of a catalyst such as W-2 Raney nickel. By using the new composition of matter of this invention the synthesis of L-phenylalanine is shortened to fewer reactions and process steps from the current lengthy, multistep means of synthesis.Type: GrantFiled: July 31, 1987Date of Patent: January 3, 1989Assignee: The Dow Chemical CompanyInventor: Alan P. Croft
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Patent number: 4698433Abstract: This invention relates to a new composition of matter known as 2-Methyl-4-benzyl-5-oxazolidinone and a method of preparation of the new composition comprising combining ethyl acetate and the azlactone of .alpha.-acetoaminocinnamic acid in the presence of a catalyst such as W-2 Raney nickel. By using the new composition of matter of this invention the synthesis of L-phenylalanine is shortened to fewer reactions and process steps from the current lengthy, multistep means of synthesis.Type: GrantFiled: February 10, 1986Date of Patent: October 6, 1987Assignee: The Dow Chemical CompanyInventor: Alan P. Croft