Patents by Inventor Donald R. Stevenson
Donald R. Stevenson 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: 9982112Abstract: A copolymeric polyphosphite is described: wherein each R1 through R5 can be the same or different and independently selected from the group consisting of C12-20 alkyl, C12-22 alkenyl, C12-40 cycloalkyl, C12-40-cycloalkenyl, C12-20 alkyl glycol ethers and A-OH and B—OH are different end-capping groups and independently selected from the group consisting of C2-40 alkylene, C7-40 cycloalkylene, C3-20 alkyl glycol ethers, C3-40 alkyl lactone, and —R7—N(R8)—R9—; wherein R7 and through R9 are independently selected from the group C1-20 alkyl, C2-22 alkenyl, C6-40 cycloalkyl, C7-40 cycloalkylene and H; m and n are integers from 1 to 100 inclusive, with various provisos.Type: GrantFiled: July 16, 2014Date of Patent: May 29, 2018Assignee: Dover Chemical CorporationInventors: Michael R. Jakupca, Jacob M. Lance, Donald R. Stevenson
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Patent number: 9745425Abstract: A polymeric polyphosphite and copolymeric polyphosphite is described which contains a cycloaliphatic moiety, preferably cyclohexane dimethanol, in the polyphosphite backbone chain. Incorporation of the polymeric polyphosphite into synthetic polymers reduces the yellowness index of any polymer into which the polymeric polyphosphite additive has been added, as well as increased hydrolytic stability as well as increased resistance to migration in food packaging.Type: GrantFiled: June 19, 2014Date of Patent: August 29, 2017Assignee: Dover Chemical CorporationInventors: Michael R. Jakupca, Jacob M. Lance, Donald R. Stevenson
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Publication number: 20160340493Abstract: The invention pertains generally to an improved polymer composition which contains at least one polymeric polyphosphite or copolymeric polyphosphite additive containing no alkylphenols. Alkylphenol-free polymeric polyphosphites offer distinct advantages over conventional phosphite technology in rubbers and rubber compounds. Polymeric polyphosphites offer improved performance in regards to the prevention of color formation during high temperature processing and NOx aging.Type: ApplicationFiled: August 1, 2016Publication date: November 24, 2016Applicant: Dover Chemical CorporationInventors: Michael R. Jakupca, Jacob M. Lance, Donald R. Stevenson
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Publication number: 20140378590Abstract: A polymeric polyphosphite and copolymeric polyphosphite is described which contains a cycloaliphatic moiety, preferably cyclohexane dimethanol, in the polyphosphite backbone chain. Incorporation of the polymeric polyphosphite into synthetic polymers reduces the yellowness index of any polymer into which the polymeric polyphosphite additive has been added, as well as increased hydrolytic stability as well as increased resistance to migration in food packaging.Type: ApplicationFiled: June 19, 2014Publication date: December 25, 2014Applicant: DOVER CHEMICAL CORPORATIONInventors: Michael R. Jakupca, Jacob M. Lance, Donald R. Stevenson
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Publication number: 20140329943Abstract: An alkylphenol-free colorless liquid copolymeric polyphosphite is described of generic formula: wherein each R1, R2, R3, R4 and R5 can be the same or different and independently selected from the group consisting of C12-20 alkyl, C12-22 alkenyl, C12-40 cycloalkyl, C12-40-cycloalkenyl, C12-20 alkyl glycol ethers and A-OH and B—OH as an end-capping groups; each A and B are different and independently selected from the group consisting of C2-40 alkylene, C7-40 cycloalkylene, C3-20 alkyl glycol ethers, C3-40 alkyl lactone, and —R7—N(R8)—R9—; wherein R7, R8 and R9 are independently selected from the group C1-20 alkyl, C2-22 alkenyl, C6-40 cycloalkyl, C7-40 cycloalkylene and H; m and n are integral values ranging from 1 to 100 inclusive, with the proviso that when —O-A or —O—B are C3-20 alkyl glycol ethers, x or y is an integral value no less than 7; x and y are integral values ranging from 1 to 1,000 wherein x+y sum to at least 3; and further wherein no more than two of R1, R2, R3, R4 and R5 are terminated wType: ApplicationFiled: July 16, 2014Publication date: November 6, 2014Applicant: DOVER CHEMICAL CORPORATIONInventors: Michael R. Jakupca, Jacob M. Lance, Donald R. Stevenson
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Publication number: 20110196079Abstract: A process to stabilize a polymer is described utilizing the step of adding a phosphite reaction product of a triphenyl phosphite or lower molecular weight trialkyl phosphite (e.g., trimethyl phosphite) or triaryl phosphite, with from approximately 1 to 2 moles of preferably a paracumyl phenol, and with from approximately 1 to 2 moles of at least C12-20 carbon alkyl or C12-20 alkenyl alcohol.Type: ApplicationFiled: February 5, 2010Publication date: August 11, 2011Applicant: DOVER CHEMICAL CORPORATIONInventors: Michael JAKUPCA, Jacob M. LANCE, Nina BERSAGLINI, Donald R. STEVENSON
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Patent number: 7595412Abstract: A novel composition and methods of its use and preparation of polybasic metal carboxylate complexes having the general formula: (A)2M.nD(OH)2.xH2O.m(B)2N wherein: A is an organic fatty acid and is selected from the group consisting of saturated C12-24 carboxylic acids, unsaturated C12-24 carboxylic acids, aromatic C12-24 carboxylic acids, alicyclic C12-24 carboxylic acids, polycarboxylic acid derivatives thereof, anhydride derivatives thereof and blends thereof, preferably stearate; M is a divalent metal cation, preferably calcium; n is a fractional or whole number from about 1 to about 10 inclusive; D is an alkali earth metal, preferably calcium; x is a fractional or whole number from about 0 to about 3 inclusive; N is a divalent metal cation other than calcium, preferably zinc; and m is a fractional or whole number from 0 to about 1.Type: GrantFiled: August 5, 2002Date of Patent: September 29, 2009Assignee: Dover Chemical CorporationInventors: Thomas Jennings, Ssatyan Kodali, W. Matthew Fender, Donald R. Stevenson
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Patent number: 7470735Abstract: Various phenol-free phosphites for use in PVC as an alternative to the conventional phenol-containing products phenyl diisodecyl phosphite and diphenyl isodecyl phosphite were tested. These phosphites utilize para-cumyl phenol-based derivatives in order to provide a phenol free derivative of the above mentioned conventional phosphites.Type: GrantFiled: May 14, 2004Date of Patent: December 30, 2008Assignee: Dover Chemical CorporationInventors: Donald R. Stevenson, Duong N. Nguyen, Mark E. Harr, Michael R. Jakupca
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Patent number: 7320764Abstract: The invention relates to liquid polymer additive compositions comprising blends of phosphite esters selected from the group consisting of aryl phosphites, alkyl phosphites, aryl/alkyl phosphites, bisphenol-A phosphites, dialkylene glycol phosphites and polydialkylene glycol phosphites, pentaerythritol phosphites, p-cumyl phenol phosphites with from 50 to 800 ppm inclusive of zinc per 100 parts resin. The stabilizer is used as either a complete or a partial replacement of toxic-metal containing antioxidant stabilizer additives.Type: GrantFiled: May 11, 2004Date of Patent: January 22, 2008Assignee: Dover Chemical CorporationInventors: Donald R. Stevenson, Thomas C. Jennings, Mark E. Harr, Michael R. Jakupca
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Patent number: 7294684Abstract: The invention relates to a process and composition-of-matter for the preparation of dimeric and polymeric alkylphenol polysulfides based on paracumyl phenol for use in vulcanizable rubbers in which the additive is a dimeric or polymeric alkylphenol polysulfide non-nitrosamine-releasing additive based on paracumyl phenol.Type: GrantFiled: November 11, 2006Date of Patent: November 13, 2007Assignee: Dover Chemical CorporationInventors: Donald R. Stevenson, Satyan Kodali, Duong N. Nguyen
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Patent number: 7176252Abstract: A solid phosphite composite, having at least a portion in amorphous form, which includes at least one, preferably two or more phosphite antioxidants or alternatively at least one phosphite and at least one other polymer additive. The phosphites, at least one of which can initially be a liquid, are generally uniformly distributed since they are melt blended. A desired class of phosphites are the bis(arylalkylphenyl)pentaerythritol diphosphites, at least a portion of which is in amorphous form.Type: GrantFiled: February 13, 2004Date of Patent: February 13, 2007Assignee: Dover Chemical CorporationInventors: Donald R. Stevenson, Satyan Kodali, Carroll W. Larke
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Publication number: 20040242908Abstract: A novel composition and methods of its use and preparation of polybasic metal carboxylate complexes having the general formula: (A)2M.nD(OH)2.xH2O.m (B)2N wherein: (a) A is an organic fatty acid and is selected from the group consisting of saturated C12-24 carboxylic acids, unsaturated C12-24 carboxylic acids, aromatic C12-24 carboxylic acids, alicyclic C12-24 carboxylic acids, polycarboxylic acid derivatives thereof, anhydride derivatives thereof and blends thereof, preferably stearate; (b) M is a divalent metal cation, preferably calcium; (c) n is a fractional or whole number from about 1 to about 10 inclusive; (d) D is an alkali earth metal, preferably calcium; (e) x is a fractional or whole number from about 0 to about 3 inclusive; (f) N is a divalent metal cation other than calcium, preferably zinc; and (g) m is a fractional or whole number from 0 to about 1.Type: ApplicationFiled: February 12, 2004Publication date: December 2, 2004Inventors: Thomas Jennings, Ssatyan Kodali, W. Matthew Fender, Donald R Stevenson
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Publication number: 20040183054Abstract: The invention relates to liquid polymer additive compositions comprising blends of phosphite esters selected from the group consisting of aryl phosphites, alkyl phosphites, aryl/alkyl phosphites, bisphenol-A phosphites, dialkylene glycol phosphites and polydialkylene glycol phosphites, pentaerythritol phosphites, p-cumyl phenol phosphites with from 50 to 800 ppm inclusive of zinc per 100 parts resin. The stabilizer is used as either a complete or a partial replacement of toxic-metal containing antioxidant stabilizer additives.Type: ApplicationFiled: May 11, 2004Publication date: September 23, 2004Applicant: DOVER CHEMICAL CORPORATIONInventors: Donald R. STEVENSON, Thomas C. JENNINGS, Mark E. HARR, Michael R. Jakupca
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Publication number: 20040180999Abstract: Various phenol-free phosphites for use in PVC as an alternative to the conventional phenol-containing products phenyl diisodecyl phosphite and diphenyl isodecyl phosphite were tested. These phosphites utilize para-cumyl phenol-based derivatives in order to provide a phenol free derivative of the above mentioned conventional phosphites.Type: ApplicationFiled: May 14, 2004Publication date: September 16, 2004Applicant: DOVER CHEMICAL CORPORATIONInventors: Donald R. STEVENSON, Duong N. NGUYEN, Mark E. HARR, Michael R. JAKUPCA
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Publication number: 20040164279Abstract: A solid phosphite composite, having at least a portion in amorphous form, which includes at least one, preferably two or more phosphite antioxidants or alternatively at least one phosphite and at least one other polymer additive. The phosphites, at least one of which can initially be a liquid, are generally uniformly distributed since they are melt blended. A desired class of phosphites are the bis(arylalkylphenyl)pentaerythritol diphosphites, at least a portion of which is in amorphous form.Type: ApplicationFiled: February 13, 2004Publication date: August 26, 2004Inventors: Donald R. Stevenson, Satyan Kodali, Carroll W. Larke
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Patent number: 6362260Abstract: Liquid organic phosphites of low volatility, based on pentaerythritol, alkyl alcohols and alkyl phenols, which are essentially phenol-free are disclosed. These phosphites are excellent stabilizers for polymers, especially PVC resins. The phenol-free phosphite stabilizers are compatible with mixed metal stabilizers and give excellent color and processing stability.Type: GrantFiled: December 22, 1999Date of Patent: March 26, 2002Assignee: Dover Chemical CorporationInventors: Donald R. Stevenson, Duong Nguyen
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Patent number: 6174125Abstract: The present invention is directed towards a method for racking or unracking pipe to or from a rack and a device to facilitate the process. The method provides a controllable procedure for inserting or withdrawing the pipe that is less dangerous than prior art methods and does not damage the pipe end. The method entails inserting a pipe gripper having an expansion sleeve into an accessible end of a pipe. The expansion sleeve is forced against an inner wall of the pipe, coupling the pipe gripper to the pipe. Depending upon the application, the pipe is then either pushed fully onto the rack or is pulled partially off the rack. For unracking operations, a crane sling is attached to the partially unracked pipe and the pipe is further manipulated off the rack.Type: GrantFiled: September 29, 1999Date of Patent: January 16, 2001Assignee: Newport News Shipbuilding & Dry Dock CompanyInventors: Marney L. Davis, George H. Wallace, Loren C. Cave, Donald R. Stevenson
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Patent number: 5939366Abstract: The invention pertains to chlorine-free extreme pressure metalworking fluid additives and lies in the recognition of the improved hydrolytic stability of alkanoic acid esters of cyclohexane dimethanol and other esters embodying similar structures. The various derivatives which are effective as extreme pressure additives include those which fall within the generic description ##STR1## wherein R.sup.1 through R.sup.4 are independently selected from the group hydrogen and C.sub.1-24 hydrocarbyl groups and R.sup.5 and R.sup.6 are independently selected from the group C.sub.3-24 hydrocarbyl groups.Type: GrantFiled: February 26, 1998Date of Patent: August 17, 1999Assignee: Dover Chemical Corp.Inventors: James MacNeil, Donald R. Stevenson, Barbara A. Wade, Joseph C. Fette
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Patent number: 5780400Abstract: The invention pertains to chlorine-free extreme pressure metalworking fluid additives and lies in the recognition of the improved hydrolytic stability of alkanoic acid esters of cyclohexane dimethanol and other esters embodying similar structures. The various derivatives which are effective as extreme pressure additives include those which fall within the generic description ##STR1## wherein R.sup.1 through R.sup.4 are independently selected from the group hydrogen and C.sub.1-24 hydrocarbyl groups and R.sup.5 and R.sup.6 are independently selected from the group C.sub.3-24 hydrocarbyl groups.Type: GrantFiled: July 21, 1997Date of Patent: July 14, 1998Assignee: Dover Chemical Corp.Inventors: James MacNeil, Donald R. Stevenson, Barbara A. Wade, Joseph C. Fette
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Patent number: 5532401Abstract: An improved process for the preparation of tris(nonylphenyl) phosphite is described which includes the steps of combining at least a 4 weight percent excess of nonylphenol (preferably 8 weight percent excess) with PCl.sub.3 with agitation and heating sufficient to liberate HCl formed during the synthetic reaction as a by-product and removing the excess nonylphenol from the tris(nonylphenyl) phosphite by thin film distillation to reduce the residual chloride level to 90 ppm or less, an acid number of 0.1 or less and a nonylphenol content after stripping of 0.1 weight percent or less. The temperature of the reaction was from room temperature to 130.degree. C., and the temperature of the evaporator which removes the excess nonylphenol is from 100.degree. C. to 350.degree. C., preferably from 150.degree. C. to 250.degree. C., under a system vacuum of from 0.01 mm Hg to 5 mm Hg.Type: GrantFiled: January 19, 1995Date of Patent: July 2, 1996Assignee: Dover Chemical CorporationInventors: Donald R. Stevenson, Daniel L. Clark, John C. Debevec, Charles N. Slater, Carroll W. Larke