Patents by Inventor Donald Kendall Drummond
Donald Kendall Drummond 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: 7220789Abstract: The present invention relates to a product, a process for its preparation and the use of such in plastic film production. More specifically, the present invention relates to an antiblock talc, a process for the preparation of such and its use as an additive in the production of polyolefin film. Polyolefin films produced according to the process of the present invention are useful in a broad range of packaging and film covering applications.Type: GrantFiled: June 25, 2003Date of Patent: May 22, 2007Inventor: Donald Kendall Drummond
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Patent number: 7033428Abstract: The present invention relates to an acid-stabilized calcium carbonate slurry having a pH of less than 7, preferably between about 6 and about 7, containing water, calcium carbonate, preferably precipitated calcium carbonate, and an acid-stabilizer of a water soluble calcium salt, a weak acid, a chelating agent, a weak acid capable of chelating calcium ion, or a mixture thereof. The acid-stabilizer is present in an amount sufficient to provide an aqueous calcium carbonate slurry having an increased calcium ion concentration and an acidic pH. In a typical acid-stabilized calcium carbonate slurry of the invention, the acid-stabilizer is present in an amount sufficient to provide a calcium ion concentration of about 1 millimolar to about 5 molar, preferably from about 1 to about 120 millimolar.Type: GrantFiled: April 4, 2001Date of Patent: April 25, 2006Assignee: Minerals Technologies Inc.Inventor: Donald Kendall Drummond
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Publication number: 20040087682Abstract: The present invention relates to a product, a process for its preparation and the use of such in plastic film production. More specifically, the present invention relates to an antiblock talc, a process for the preparation of such and its use as an additive in the production of polyolefin film.Type: ApplicationFiled: June 25, 2003Publication date: May 6, 2004Applicant: Minerals Technologies Inc.Inventor: Donald Kendall Drummond
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Patent number: 6613856Abstract: Novel polymers are provided having phosphonated and sulphonated substituent groups such that the polymer is multifunctional in its use. Optional amide substituents are used to reduce electrostatic charge density or for hydrogen bonding. An advantage of the polymer is the flexibility of using it for multiple purposes. A particular application is for bonding paper fillers and paper fiber together.Type: GrantFiled: May 24, 2000Date of Patent: September 2, 2003Assignee: Minerals Technologies Inc.Inventors: Donald Kendall Drummond, Patrick Clinton Wernett
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Patent number: 6602385Abstract: A method of improving the brightness of calcium carbonate filled paper. The filled paper is dried and then bleached with an aqueous solution of a bleaching agent. The process may be used on all grades of paper that contain filler and is particularly useful in the bleaching of low brightness grade papers that are produced from mechanical pulp that contain calcium carbonate.Type: GrantFiled: January 28, 1997Date of Patent: August 5, 2003Assignee: Minerals Technologies Inc.Inventor: Donald Kendall Drummond
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Patent number: 6593400Abstract: The present invention relates to a product, a process for its preparation and the use of such in plastic film production. More specifically, the present invention relates to an antiblock talc, a process for the preparation of such and its use as an additive in the production of polyolefin film. Polyolefin films produced according to the process of the present invention are useful in a broad range of packaging and film covering applications.Type: GrantFiled: June 30, 1999Date of Patent: July 15, 2003Assignee: Minerals Technologies Inc.Inventor: Donald Kendall Drummond
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Publication number: 20020148582Abstract: The present invention relates to an acid-stabilized calcium carbonate slurry having a pH of less than 7, preferably between about 6 and about 7, containing water, calcium carbonate, preferably precipitated calcium carbonate, and an acid-stabilizer of a water soluble calcium salt, a weak acid, a chelating agent, a weak acid capable of chelating calcium ion, or a mixture thereof. The acid-stabilizer is present in an amount sufficient to provide an aqueous calcium carbonate slurry having an increased calcium ion concentration and an acidic pH. In a typical acid-stabilized calcium carbonate slurry of the invention, the acid-stabilizer is present in an amount sufficient to provide a calcium ion concentration of about 1 millimolar to about 5 molar, preferably from about 1 to about 120 millimolar.Type: ApplicationFiled: April 4, 2001Publication date: October 17, 2002Applicant: Minerals Technologies Inc.Inventor: Donald Kendall Drummond
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Patent number: 6287423Abstract: Novel polymers are provided having phosphonated and sulphonated substituent groups such that the polymers is multifunctional in its use. Optional amide substituents are used to reduce electrostatic charge density or for hydrogen bonding. An advantage of the polymer is the flexibility of using it for multiple purposes. A particular application is for bonding paper fillers and paper fiber together.Type: GrantFiled: April 6, 1999Date of Patent: September 11, 2001Assignee: Minerals Technologies Inc.Inventors: Donald Kendall Drummond, Patrick Clinton Wernett
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Patent number: 6228161Abstract: The present invention relates to an acid-stabilized calcium carbonate slurry having a pH of less than 7, preferably between about 6 and about 7, containing water, calcium carbonate, preferably precipitated calcium carbonate, and an acid-stabilizer of a water soluble calcium salt, a weak acid, a chelating agent, a weak acid capable of chelating calcium ion, or a mixture thereof. The acid-stabilizer is present in an amount sufficient to provide an aqueous calcium carbonate slurry having an increased calcium ion concentration and an acidic pH. In a typical acid-stabilized calcium carbonate slurry of the invention, the acid-stabilizer is present in an amount sufficient to provide a calcium ion concentration of about 1 millimolar to about 5 molar, preferably from about 1 to about 120 millimolar.Type: GrantFiled: December 30, 1996Date of Patent: May 8, 2001Assignee: Minerals Technologies Inc.Inventor: Donald Kendall Drummond
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Patent number: 6228249Abstract: The present invention provides an electrochemical process for reducing metal contaminants in calcium carbonate by solubilizing the metal contaminate in an aqueous solution of calcium carbonate and then removing the solubilized metal contaminant by passing an electrical current through the aqueous calcium carbonate solution containing the solubilized metal contaminant. Calcium carbonate produced according to the process of this invention is particularly suitable for use as food or pharmaceutical additives. The calcium carbonate is also suitable for use in papermaking process as fillers, or coatings, or as additives in the production of plastics, paints and adhesive products. Other uses of high purity calcium carbonate include catalysts and catalyst supports, electrical/semiconductor applications, florescent lighting, and optical/laser applications.Type: GrantFiled: June 30, 1999Date of Patent: May 8, 2001Assignee: Minerals Technologies Inc.Inventor: Donald Kendall Drummond
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Patent number: 6184258Abstract: A process for the production of a synthetically produced bentonite-type inorganic microparticle. The synthetic microparticle produced according to the process of the present invention is particularly useful in papermaking processes where retention, water drainage, sheet formation and tangible cost saving opportunities are important.Type: GrantFiled: February 7, 1997Date of Patent: February 6, 2001Assignee: Minerals Technologies Inc.Inventor: Donald Kendall Drummond
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Patent number: 6183650Abstract: A composition comprising the product precipitated in the admixing of a soluble metal salt and one or more compounds having a component selected from silicates, phosphates and borates; and a method for controlling drainage and/or retention in the formation of a paper matrix or for treating water comprising the use of such product.Type: GrantFiled: October 13, 1999Date of Patent: February 6, 2001Assignee: Minerals Technologies Inc.Inventor: Donald Kendall Drummond
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Patent number: 6090242Abstract: Novel polymers are provided having phosphonated and sulphonated substituent groups such that the polymer is multifunctional in its use. Optional amide substituent are used to reduce electrostatic charge density or for hydrogen bonding. An advantage of the polymer is the flexibility of using it for multiple purposes. A particular application is for bonding paper fillers and paper fiber together.Type: GrantFiled: April 6, 1999Date of Patent: July 18, 2000Assignee: Minerals Technologies Inc.Inventors: Donald Kendall Drummond, Patrick Clinton Wernett
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Patent number: 6017991Abstract: This invention concerns a mixture of a first component selected from talcs and one or more second component(s) selected from diatomaceous earth, natural and synthetic silica, clay, ceramic spheres, volcanic ash and glass cullet wherein the ratio of the component to the second component(s) provides an enhanced abrasiveness property, an enhanced die pressure character, and a reduced melt fracture character. The invention further relates to an antiblock agent made from such mixture that significantly reduces or eliminates the need to provide polymer processing additives. This invention also relates to a masterbatch composition having an admixture such that enhanced die pressure character and/or reduced melt fracture character are obtained.Type: GrantFiled: August 10, 1998Date of Patent: January 25, 2000Assignee: Minerals Technologies Inc.Inventors: Donald Kendall Drummond, Joseph Anthony Radosta, Donald Richard Deutsch
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Patent number: 5989714Abstract: A composition comprising the product precipitated in the admixing of a soluble metal salt and one or more compounds having a component selected from silicates, phosphates and borates; and a method for controlling drainage and/or retention in the formation of a paper matrix or for treating water comprising the use of such product.Type: GrantFiled: May 4, 1998Date of Patent: November 23, 1999Assignee: Minerals Technologies Inc.Inventor: Donald Kendall Drummond
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Patent number: 5690897Abstract: A method for lowering the iron content of calcium carbonate is disclosed. The method involves addition of an iron chelating agent to an aqueous calcium carbonate slurry, reducing the pH of the aqueous calcium carbonate by employing carbon dioxide containing gas, while maintaining the aqueous calcium carbonate slurry at an elevated temperature. The slurry is stirred, filtered, washed and dried. The calcium carbonate product resulting from the process of the present invention has a reduced iron content.Calcium carbonate produced according to the method of this invention is particularly suitable for use as food or pharmaceutical additives and may also be useful as a filler in papermaking processes or as additives in plastic products.Type: GrantFiled: November 21, 1994Date of Patent: November 25, 1997Assignee: Minerals Technologies Inc.Inventor: Donald Kendall Drummond