Patents by Inventor Dhiren V. Patel
Dhiren V. Patel 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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Publication number: 20210355299Abstract: Disclosed herein are compositions comprising polysaccharide particles with an average size of about 0.1-10 mm. These particles comprise at least (i) about 50%-90% by weight water or an aqueous solution, and (ii) about 10%-50% by weight insoluble alpha-glucan, or an insoluble cationic ether thereof, comprising alpha-1,3-glycosidic linkages and having a weight-average degree of polymerization (DPw) of at least about 100. Further disclosed are methods of preparing these compositions, as well as systems for storing and/or moving them.Type: ApplicationFiled: March 1, 2021Publication date: November 18, 2021Inventors: TIMOTHY ALLAN BELL, DEAN M. FAKE, SCOTT M. HERKIMER, DHIREN V. PATEL, TYLER D. PRITCHETT
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Patent number: 10934418Abstract: Disclosed herein are compositions comprising polysaccharide particles with an average size of about 0.1-10 mm. These particles comprise at least (i) about 50%-90% by weight water or an aqueous solution, and (ii) about 10%-50% by weight insoluble alpha-glucan, or an insoluble cationic ether thereof, comprising alpha-1,3-glycosidic linkages and having a weight-average degree of polymerization (DPw) of at least about 100. Further disclosed are methods of preparing these compositions, as well as systems for storing and/or moving them.Type: GrantFiled: January 28, 2020Date of Patent: March 2, 2021Assignee: DUPONT INDUSTRIAL BIOSCIENCES USA, LLCInventors: Timothy Allan Bell, Dean M. Fake, Scott M. Herkimer, Dhiren V. Patel, Tyler D. Pritchett
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Publication number: 20200157320Abstract: Disclosed herein are compositions comprising polysaccharide particles with an average size of about 0.1-10 mm. These particles comprise at least (i) about 50%-90% by weight water or an aqueous solution, and (ii) about 10%-50% by weight insoluble alpha-glucan, or an insoluble cationic ether thereof, comprising alpha-1,3-glycosidic linkages and having a weight-average degree of polymerization (DPw) of at least about 100. Further disclosed are methods of preparing these compositions, as well as systems for storing and/or moving them.Type: ApplicationFiled: January 28, 2020Publication date: May 21, 2020Inventors: TIMOTHY ALLAN BELL, DEAN M. FAKE, SCOTT M. HERKIMER, DHIREN V. PATEL, TYLER D. PRITCHETT
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Patent number: 10584233Abstract: Disclosed herein are compositions comprising polysaccharide particles with an average size of about 0.1-10 mm. These particles comprise at least (i) about 50%-90% by weight water or an aqueous solution, and (ii) about 10%-50% by weight insoluble alpha-glucan, or an insoluble cationic ether thereof, comprising alpha-1,3-glycosidic linkages and having a weight-average degree of polymerization (DPw) of at least about 100. Further disclosed are methods of preparing these compositions, as well as systems for storing and/or moving them.Type: GrantFiled: October 12, 2018Date of Patent: March 10, 2020Assignee: DUPONT INDUSTRIAL BIOSCIENCES USA, LLCInventors: Timothy Allan Bell, Dean M. Fake, Scott M. Herkimer, Dhiren V. Patel, Tyler D. Pritchett
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Publication number: 20190112456Abstract: Disclosed herein are compositions comprising polysaccharide particles with an average size of about 0.1-10 mm. These particles comprise at least (i) about 50%-90% by weight water or an aqueous solution, and (ii) about 10%-50% by weight insoluble alpha-glucan, or an insoluble cationic ether thereof, comprising alpha-1,3-glycosidic linkages and having a weight-average degree of polymerization (DPw) of at least about 100. Further disclosed are methods of preparing these compositions, as well as systems for storing and/or moving them.Type: ApplicationFiled: October 12, 2018Publication date: April 18, 2019Inventors: TIMOTHY ALLAN BELL, DEAN M. FAKE, SCOTT M. HERKIMER, DHIREN V. PATEL, TYLER D. PRITCHETT
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Patent number: 9201314Abstract: The invention provides an apparatus for preparing a relief printing form from a photosensitive element. More specifically, this invention describes an apparatus for preparing a relief form in an environment having controlled oxygen concentration during exposure to actinic radiation. The apparatus includes means for exposing a photosensitive element having an in-situ mask to actinic radiation through the in-situ mask in an environment having an inert gas and a concentration of oxygen between 190,000 and 100 ppm, and treating the exposed element to form the relief printing form having a pattern of raised surface areas.Type: GrantFiled: June 11, 2012Date of Patent: December 1, 2015Assignee: E I DU PONT DE NEMOURS AND COMPANYInventors: Michael Lee Rudolph, Joseph Anthony Perrotto, Dhiren V Patel, Robert A McMillen
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Publication number: 20130148089Abstract: The invention provides a method and an apparatus for preparing a relief printing form from a photosensitive element. More specifically, this invention describes a method and an apparatus for preparing a relief form in an environment having controlled oxygen concentration during exposure to actinic radiation. The method includes forming an in-situ mask on a photosensitive element, exposing the element to actinic radiation through the in-situ mask in an environment having an inert gas and a concentration of oxygen between 190,000 and 100 ppm, and treating the exposed element to form the relief printing form having a pattern of raised surface areas.Type: ApplicationFiled: June 11, 2012Publication date: June 13, 2013Applicant: E I DU PONT DE NEMOURS AND COMPANYInventors: MICHAEL LEE RUDOLPH, Joseph Anthony Perrotto, Dhiren V. Patel, Robert A. McMillen
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Publication number: 20120258406Abstract: The invention provides a method and an apparatus for preparing a relief printing form from a photosensitive element. More specifically, this invention describes a method and an apparatus for preparing a relief form in an environment having controlled oxygen concentration during exposure to actinic radiation. The method includes forming an in-situ mask on a photosensitive element, exposing the element to actinic radiation through the in-situ mask in an environment having an inert gas and a concentration of oxygen between 190,000 and 100 ppm, and treating the exposed element to form the relief printing form having a pattern of raised surface areas.Type: ApplicationFiled: June 20, 2012Publication date: October 11, 2012Applicant: E I DU PONT DE NEMOURS AND COMPANYInventors: MICHAEL LEE RUDOLPH, JOSEPH ANTHONY PERROTTO, DHIREN V. PATEL, ROBERT A. MCMILLEN
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Patent number: 8241835Abstract: A relief printing form is prepared from a photosensitive element in an environment having controlled oxygen concentration during exposure to actinic radiation. An in situ mask is formed on a photosensitive element, the element is exposed to actinic radiation through the in-situ mask in an environment having an inert gas and a concentration of oxygen between 190,000 and 100 ppm, and the exposed element is treated to form the relief printing form having a pattern of raised surface areas.Type: GrantFiled: March 10, 2009Date of Patent: August 14, 2012Assignee: E I du Pont de Nemours and CompanyInventors: Michael Lee Rudolph, Joseph Anthony Perrotto, Dhiren V. Patel, Robert A. McMillen
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Publication number: 20090191482Abstract: The invention provides a method and an apparatus for preparing a relief printing form from a photosensitive element. More specifically, this invention describes a method and an apparatus for preparing a relief form in an environment having controlled oxygen concentration during exposure to actinic radiation. The method includes forming an in-situ mask on a lo photosensitive element, exposing the element to actinic radiation through the in-situ mask in an environment having an inert gas and a concentration of oxygen between 190,000 and 100 ppm, and treating the exposed element to form the relief printing form having a pattern of raised surface areas.Type: ApplicationFiled: January 21, 2009Publication date: July 30, 2009Applicant: E.I. DU PONT DE NEMOURS AND COMPANYInventors: MICHAEL LEE RUDOLPH, Joseph Anthony Perrotto, Dhiren V. Patel, Robert A. McMillen
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Publication number: 20090191483Abstract: The invention provides a method and an apparatus for preparing a relief printing form from a photosensitive element. More specifically, this invention describes a method and an apparatus for preparing a relief form in an environment having controlled oxygen concentration during exposure to actinic radiation. The method includes forming an in-situ mask on a photosensitive element, exposing the element to actinic radiation through the in-situ mask in an environment having an inert gas and a concentration of oxygen between 190,000 and 100 ppm, and treating the exposed element to form the relief printing form having a pattern of raised surface areas.Type: ApplicationFiled: March 10, 2009Publication date: July 30, 2009Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: Michael Lee Rudolph, Joseph Anthony Perrotto, Dhiren V. Patel, Robert A. McMillen
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Patent number: 6852156Abstract: A process is provided in which a pigment is oxidated with ozone in an aqueous environment in which the mixture of ozone, water and pigment is subjected to a dispersive mixing operation; and/or the pH of the mixture is maintained in a range of 6-8, whereby the pigment is self-dispersing and preferably has an acid value of less than 3 ?moles/M2. Pigments from this process and ink jet inks containing the self-dispersing pigments, are also provided.Type: GrantFiled: May 23, 2001Date of Patent: February 8, 2005Assignee: E.I. du Pont de Nemours and CompanyInventors: An-Gong Yeh, Michael J. Eiseman, Robert Paul Held, James L. Hohman, Dhiren V. Patel, Yia-Ching Ray, Harry Joseph Spinelli, Sandra L. Witman
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Publication number: 20020014184Abstract: A process is provided in which a pigment is oxidated with ozone in an aqueous environment in which the mixture of ozone, water and pigment is subjected to a dispersive mixing operation; and/or the pH of the mixture is maintained in a range of 6-8, whereby the pigment is self-dispersing and preferably has an acid value of less than 3 &mgr;moles/M2. Pigments from this process and ink jet inks containing the self-dispersing pigments, are also provided.Type: ApplicationFiled: May 23, 2001Publication date: February 7, 2002Inventors: An-Gong Yeh, Michael J. Eiseman, Robert Paul Held, James L. Hohman, Dhiren V. Patel, Yia-Ching Ray, Harry Joseph Spinelli, Sandra L. Witman
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Patent number: 5434315Abstract: Polyether glycols, especially poly(tetramethylene ether) glycols, having a narrow molecular weight distribution (e.g., Mw/Mn=1.2 to 1.80), are made by a process which consists of separating the low molecular weight fraction in an ultrafiltration module. In these units, molten PTMEG is fed at temperatures in the range of 30.degree. to 150.degree. C. and pressures ranging between 25 and 1500 psi. The PTMEG retentate from the ultrafiltration unit is also characterized by water content <25 ppm and low to negligible concentration of oligomeric cyclic ethers.Type: GrantFiled: February 22, 1994Date of Patent: July 18, 1995Assignee: E. I. du Pont de Nemours and CompanyInventors: Suriyanarayanan Dorai, William W. Goudie, Sarah E. Ochsenhirt, Dhiren V. Patel, James R. Cavall