Patents by Inventor Jan M. Stouffer
Jan M. Stouffer 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: 6069228Abstract: Disclosed is a process for the preparation of polyamide polymers via prepolymer formation in a reactor system comprising a reactor, flasher and separator, crystallization of the prepolymer under controlled temperature conditions and the subsequent conversion of these crystallized prepolymers to high molecular weight polymer.Type: GrantFiled: August 17, 1998Date of Patent: May 30, 2000Assignee: E. I. du Pont de Nemours and CompanyInventors: Albert Walter Alsop, Elwood Neal Blanchard, Jeffrey D. Cohen, John Maurice Iwasyk, Clara Young Lin, David Neil Marks, Jan M. Stouffer
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Patent number: 5990265Abstract: Disclosed herein is a novel physical form of low molecular weight poly(trimethylene terephthalate). This form may be produced from molten low molecular weight poly(trimethylene terephthalate) material by means of rapid heat transfer from the material. The poly(trimethylene terephthalate) composition is suitable for use as a starting material for solid-state polymerization in order to produce polymers of higher molecular weight.Type: GrantFiled: June 22, 1998Date of Patent: November 23, 1999Assignee: E. I. du Pont de Nemours and CompanyInventors: Elwood Neal Blanchard, Craig Robert Gochanour, Kenneth Wayne Leffew, Jan M. Stouffer
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Patent number: 5830982Abstract: Disclosed herein is a novel crystalline form of low molecular weight poly(ethylene terephthalate). This crystalline form may be produced from molten or glassy low molecular weight poly(ethylene terephthalate) material by means of rapid heat transfer to or from the material. The poly(ethylene terephthalate) composition is suitable for use as a starting material for solid-state polymerization in order to produce polymers of higher molecular weight. A higher molecular weight polymer product having a unique physical form can be produced by solid-state polymerization of the low molecular weight poly(ethylene terephthalate).Type: GrantFiled: April 8, 1997Date of Patent: November 3, 1998Assignee: E. I. du Pont de Nemours and CompanyInventors: Jan M. Stouffer, Elwood Neal Blanchard, Kenneth Wayne Leffew
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Patent number: 5763104Abstract: Disclosed herein is a novel crystalline form of low molecular weight poly(trimethylene terephthalate). This crystalline form may be produced from molten or glassy low molecular weight poly(trimethylene terephthalate) material by means of rapid heat transfer to or from the material. The poly(trimethylene terephthalate) composition is suitable for use as a starting material for solid-state polymerization in order to produce polymers of higher molecular weight.Type: GrantFiled: December 12, 1996Date of Patent: June 9, 1998Assignee: E. I. du Pont de Nemours & CompanyInventors: Jan M. Stouffer, Elwood Neal Blanchard, Kenneth Wayne Leffew
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Patent number: 5744074Abstract: This invention relates to a process and apparatus for forming a polyester polymer into particles. More particularly, this invention relates to a process and apparatus for forming crystalline, uniform pellets from an amorphous polyester melt. The polyester pellets have utility, for example, as feedstock for a process for producing higher molecular weight polyesters.Type: GrantFiled: August 8, 1996Date of Patent: April 28, 1998Assignee: E. I. du Pont de Nemours and CompanyInventors: Jan M. Stouffer, Elwood Neal Blanchard, Kenneth Wayne Leffew
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Patent number: 5730913Abstract: This invention relates to a process and apparatus for forming a polyester polymer into particles. More particularly, this invention relates to a process and apparatus for forming crystalline, uniform pellets from an amorphous polyester melt. The polyester pellets have utility, for example, as feedstock for a process for producing higher molecular weight polyesters.Type: GrantFiled: August 8, 1996Date of Patent: March 24, 1998Assignee: E. I. du Pont de Nemours and CompanyInventors: Jan M. Stouffer, Elwood Neal Blanchard, Kenneth Wayne Leffew
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Patent number: 5714262Abstract: Disclosed herein is a novel crystalline form of low molecular weight poly(ethylene terephthalate). This crystalline form may be produced from molten or glassy low molecular weight poly(ethylene terephthalate) material by means of rapid heat transfer to or from the material. The poly(ethylene terephthalate) composition is suitable for use as a starting material for solid-state polymerization in order to produce polymers of higher molecular weight. A higher molecular weight polymer product having a unique physical form can be produced by solid-state polymerization of the low molecular weight poly(ethylene terephthalate).Type: GrantFiled: December 22, 1995Date of Patent: February 3, 1998Assignee: E. I. Du Pont de Nemours and CompanyInventors: Jan M. Stouffer, Elwood Neal Blanchard, Kenneth Wayne Leffew
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Patent number: 5670606Abstract: Disclosed herein is a novel crystalline form of low molecular weight poly(ethylene 2,6-naphthalate). This crystalline form may be produced from molten or glassy low molecular weight poly(ethylene 2,6-naphthalate) material by means of rapid heat transfer to or from the material. The poly(ethylene 2,6-naphthalate) composition is suitable for use as a starting material for solid-state polymerization in order to produce polymers of higher molecular weight.Type: GrantFiled: January 5, 1996Date of Patent: September 23, 1997Assignee: E. I. Du Pont de Nemours and CompantInventors: Jan M. Stouffer, Elwood Neal Blanchard, Kenneth Wayne Leffew
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Patent number: 5633018Abstract: This invention relates to a process and apparatus for forming a polyester polymer into particles. More particularly, this invention relates to a process and apparatus for forming crystalline, uniform pellets from an amorphous polyester melt. The polyester pellets have utility, for example, as feedstock for a process for producing higher molecular weight polyesters.Type: GrantFiled: January 20, 1995Date of Patent: May 27, 1997Assignee: E. I. Du Pont de Nemours and CompanyInventors: Jan M. Stouffer, Elwood N. Blanchard, Kenneth W. Leffew
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Patent number: 5540868Abstract: The present invention relates to a process for forming robust, uniform, low molecular weight crystalline polyester particles. Such particles are useful for forming higher molecular weight polyesters, for example, by solid-state polymerization. Either conventionally-formed, essentially amorphous, non-molten polyester pellets at ambient temperatures or, alternatively, essentially amorphous molten polyester droplets, can be crystallized by rapidly subjecting the droplets or pellets to a thermal shock according to the process of the present invention.Type: GrantFiled: January 20, 1995Date of Patent: July 30, 1996Assignee: E. I. Du Pont de Nemours and CompanyInventors: Jan M. Stouffer, Elwood N. Blanchard, Kenneth W. Leffew
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Patent number: 5532333Abstract: Disclosed herein is a novel crystalline form of low molecular weight poly(ethylene terephthalate). This crystalline form may be produced from molten or glassy low molecular weight poly(ethylene terephthalate) material by means of rapid heat transfer to or from the material. The poly(ethylene terephtalate) composition is suitable for use as a starting material for solid-state polymerization in order to produce polymers of higher molecular weight.Type: GrantFiled: September 8, 1995Date of Patent: July 2, 1996Assignee: E. I. du Pont de Nemours and CompanyInventors: Jan M. Stouffer, Elwood N. Blanchard, Kenneth W. Leffew
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Patent number: 5510454Abstract: Disclosed herein is a novel crystalline form of low molecular weight poly(ethylene terephthalate). This crystalline form may be produced from molten or glassy low molecular weight poly(ethylene terephthalate) material by means of rapid heat transfer to or from the material. The poly(ethylene terephtalate) composition is suitable for use as a starting material for solid-state polymerization in order to produce polymers of higher molecular weight.Type: GrantFiled: January 20, 1995Date of Patent: April 23, 1996Assignee: E. I. Du Pont de Nemours and CompanyInventors: Jan M. Stouffer, Elwood N. Blanchard, Kenneth W. Leffew