Patents by Inventor Ravi R. Vedula
Ravi R. Vedula 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: 20230382015Abstract: The invention relates to a method of making an article by recycling a disperse dyed fabric. The fabric is made from a melt-spun thermoplastic polyurethane fiber which contains a co-polymer diol derived from caprolactone monomer and a polyether polyol. The fabric is shredded and then thermally treated to form granules, which can be melted in an extruder to form an article.Type: ApplicationFiled: October 26, 2021Publication date: November 30, 2023Applicant: Lubrizol Advanced Materials, Inc.Inventors: Lalith B. Suragani Venu, Ravi R. Vedula, Christopher A. Sprague, Brandon Walton
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Publication number: 20230374193Abstract: The invention relates to a melt-spun thermoplastic polyurethane fiber which comprises a copolymer diol derived from caprolactone and polyether polyol and fabrics made therefrom, both of which are capable of being dyed under disperse dyeing conditions.Type: ApplicationFiled: October 26, 2021Publication date: November 23, 2023Applicant: Lubrizol Advanced Materials, Inc.Inventors: Lalith B. Suragani Venu, Ravi R. Vedula, Fred Nelson, Christopher A. Sprague, Brandon Walton
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Publication number: 20230366131Abstract: The invention relates to a melt-spun thermoplastic polyurethane fiber which comprises a copolymer diol derived from caprolactone and polyether polyol and fabrics made therefrom, both of which are capable of being dyed under disperse dyeing conditions.Type: ApplicationFiled: October 26, 2021Publication date: November 16, 2023Applicant: Lubrizol Advanced Materials, Inc.Inventors: Lalith B. Suragani Venu, Ravi R. Vedula, Christopher A. Sprague, Brandon Walton
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Patent number: 9963806Abstract: The invention relates to a thermoplastic polyurethane fibers, and process of making the same, where the described fiber has good dyeability, and in some embodiments, good flame retardant properties. Such fibers are made from a composition that includes (a) a thermoplastic polyurethane itself comprising the reaction product of: (i) one or more polyols, (ii) one or more diisocyanates, (iii) one or more chain extenders, (iv) optionally one or more crosslinking agents, and (v) one or more functional modifiers wherein each said functional modifier is a reaction product of an aminodiol and a Bronsted acid.Type: GrantFiled: October 9, 2013Date of Patent: May 8, 2018Assignee: LUBRIZOL ADVANCED MATERIALS, INC.Inventors: Ravi R. Vedula, Mouh-Wahng Lee, Julius Farkas
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Patent number: 9688805Abstract: The present invention relates to elastomeric resins, fibers made from said resins, fabrics made with said fibers, and applications and uses for the resins, fibers and fabrics. The elastomer resins of the invention provide high strength fibers and well balanced fabrics with good physical properties and chemical resistance, making them attractive for use in various applications that use elastic fibers and fabrics.Type: GrantFiled: December 19, 2011Date of Patent: June 27, 2017Assignee: Lubrizol Advanced Materials, Inc.Inventors: Ravi R. Vedula, James E. Bryson, Jr., Mouh-Wahng Lee, Daniel M. Fischer, Christopher A. Sprague
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Publication number: 20170127741Abstract: The invention relates to a fiber excellent in cool contact feeling which is excellent in hand and skin touch and capable of preventing unpleasant feeling in the wet state while also having excellent elasticity. The invention also relates to fabric, clothing, and underwear excellent in cool contact feeling and obtainable by using said fiber as well as the methods of making the fibers and articles thereof.Type: ApplicationFiled: January 20, 2017Publication date: May 11, 2017Inventors: Ravi R. Vedula, Mouh-Wahng Lee
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Publication number: 20170029982Abstract: Elastic fibers are disclosed which have a relatively flat modulus curve at between 100% and 200% elongation. The fibers can be made into garments having a very comfortable feel. The preferred elastic fibers are made from thermoplastic polyurethane polymers and are made by a unique melt spinning process where the fiber is wound into bobbins at a speed just slightly higher than the melt velocity of the polymer exiting the spinneret.Type: ApplicationFiled: September 2, 2016Publication date: February 2, 2017Inventors: James E. Bryson, JR., Mouh-Wahng Lee, Christopher A. Sprague, Daniel M. Fischer, Ravi R. Vedula
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Publication number: 20160053408Abstract: The present invention relates to high strength fabrics made thereof from thin gauge constant compression elastic fibers. Elastic fibers are disclosed which have a relatively flat modulus curve, for example between 100% and 200% elongation. Garments made with the constant compression elastic fibers have a more comfortable feel to the wearer. The garments are also resistant to puncture due to the high strength fabric made with the elastic fibers.Type: ApplicationFiled: August 18, 2015Publication date: February 25, 2016Inventors: Ravi R. Vedula, James E. Bryson Jr., Mouh-Wahng Lee, Christopher A. Sprague, Daniel M. Fischer
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Publication number: 20150275402Abstract: The invention relates to a thermoplastic polyurethane fibers, and process of making the same, where the described fiber has good dyeability, and in some embodiments, good flame retardant properties. Such fibers are made from a composition that includes (a) a thermoplastic polyurethane itself comprising the reaction product of: (i) one or more polyols, (ii) one or more diisocyanates, (iii) one or more chain extenders, (iv) optionally one or more crosslinking agents, and (v) one or more functional modifiers wherein each said functional modifier is a reaction product of an aminodiol and a Bronsted acid.Type: ApplicationFiled: October 9, 2013Publication date: October 1, 2015Applicant: LUBRIZOL ADVANCE MATERIALS, INC.Inventors: Ravi R. Vedula, Mouh-Wahng Lee, Julius Farkas
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Publication number: 20140101825Abstract: The invention relates to a fiber excellent in cool contact feeling which is excellent in hand and skin touch and capable of preventing unpleasant feeling in the wet state while also having excellent elasticity. The invention also relates to fabric, clothing, and underwear excellent in cool contact feeling and obtainable by using said fiber as well as the methods of making the fibers and articles thereof.Type: ApplicationFiled: April 10, 2012Publication date: April 17, 2014Applicant: LUBRIZOL ADVANCED MATERIALS, INC.Inventors: Ravi R. Vedula, Mouh-Wahng Lee
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Publication number: 20130273285Abstract: The present invention relates to elastomeric resins, fibers made from said resins, fabrics made with said fibers, and applications and uses for the resins, fibers and fabrics. The elastomer resins of the invention provide high strength fibers and well balanced fabrics with good physical properties and chemical resistance, making them attractive for use in various applications that use elastic fibers and fabrics.Type: ApplicationFiled: December 19, 2011Publication date: October 17, 2013Applicant: Lubrizol Advanced Materials, Inc.Inventors: Ravi R. Vedula, James E. Bryson, JR., Mouh-Wahng Lee, Daniel M. Fischer, Christopher A. Sprague
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Patent number: 8425821Abstract: A spin pack assembly for use in melt spinning elastic fibers. The spin pack assembly includes a circular breaker plate having a center aperture and several circular patterns of apertures with each circular pattern having a plurality of apertures. Each circular pattern is located concentrically about an axis of the center aperture. The apertures in the outer circular patterns have a greater diameter than the apertures in the inner circular patterns. The spin pack assembly also has a spinneret plate where the exit aperture of the spinneret plate is recessed in the body of the spin pack assembly.Type: GrantFiled: September 17, 2010Date of Patent: April 23, 2013Assignee: Lubrizol Advanced Materials, Inc.Inventors: Ravi R. Vedula, James E. Bryson, Jr.
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Patent number: 8183330Abstract: The present invention discloses a thermoplastic polyurethane which is comprised of the reaction product of (1) a hydroxyl terminated intermediate, (2) a polyisocyanate, and (3) a glycol chain extender selected from the group consisting of ethylene glycol and propylene glycol; wherein the hydroxyl terminated intermediate is selected from the group consisting of hydroxyl terminated polyether intermediates and hydroxyl terminated polyester intermediates; wherein the hydroxyl terminated intermediate is comprised of repeat units that are derived from a branched glycol or is comprised of at least 2 different repeating units; wherein the thermoplastic polyurethane has a weight average molecular weight of at least 100,000 Daltons; wherein the thermoplastic polyurethane includes hard segments that are the reaction product of the polyisocyanate and the glycol chain extender; and wherein the hard segments represent from 10 to 40 weight percent of the total weight of the thermoplastic polyurethane.Type: GrantFiled: October 22, 2008Date of Patent: May 22, 2012Assignee: Lubrizol Advanced Materials, Inc.Inventors: Julius Farkas, Ravi R. Vedula, Charles P. Jacobs
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Patent number: 8148475Abstract: Thermoplastic polyether polyurethane polymers are disclosed which are mixed with a crosslinking agent to achieve long run times in a melt spinning process to make elastic fibers. The crosslinking agent is preferably a polyether or polyester polyol reacted with a diisocyanate. A melt spinning process is also disclosed using a polyether polyurethane with a crosslinking agent. Long melt spinning run times can be achieved without experiencing excessive pressure buildup in the spinneret and fiber breakage. The thermoplastic polyether polyurethane polymers are made by reacting: (1) a blend of two or more hydroxyl terminated intermediates wherein one intermediate is a polyether intermediate and has a higher number average molecular weight than the other said polyether intermediates, and wherein the weighted average number average molecular weight of said blend is greater than 1200 Daltons; (2) at least one polyisocyanate; and (3) at least one hydroxyl terminated chain extender.Type: GrantFiled: June 29, 2004Date of Patent: April 3, 2012Assignee: Lubrizol Advanced Materials, Inc.Inventors: Ravi R. Vedula, Yona Eckstein, Yinbing Xia, James E. Bryson, Jr., Christopher A. Sprague, Julius Farkas
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Publication number: 20120001362Abstract: A spin pack assembly for use in melt spinning elastic fibers. The spin pack assembly includes a circular breaker plate having a center aperture and several circular patterns of apertures with each circular pattern having a plurality of apertures. Each circular pattern is located concentrically about an axis of the center aperture. The apertures in the outer circular patterns have a greater diameter than the apertures in the inner circular patterns. The spin pack assembly also has a spinneret plate where the exit aperture of the spinneret plate is recessed in the body of the spin pack assembly.Type: ApplicationFiled: September 17, 2010Publication date: January 5, 2012Applicant: LUBRIZOL ADVANCED MATERIALS, INC.Inventors: Ravi R. Vedula, James E. Bryson, JR.
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Publication number: 20110305902Abstract: The present invention relates to high strength fabrics made thereof from thin gauge constant compression elastic fibers. Elastic fibers are disclosed which have a relatively flat modulus curve, for example between 100% and 200% elongation. Garments made with the constant compression elastic fibers have a more comfortable feel to the wearer. The garments are also resistant to puncture due to the high strength fabric made with the elastic fibers.Type: ApplicationFiled: June 15, 2011Publication date: December 15, 2011Applicant: LUBRIZOL ADVANCED MATERIALS, INC.Inventors: Ravi R. Vedula, James E. Bryson, JR., Mouh-Wahng Le, Daniel M. Fischer, Christopher A. Sprague
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Publication number: 20110183567Abstract: Elastic non-woven fabrics are disclosed which are made in a melt blown process or a spunbond process. The fabric is made from a thermoplastic polyurethane polymer mixed with a crosslinking agent to give high strength elastic non-woven fabric. The crosslinking agent is added to the polymer melt prior to the melt passing through the die which forms the individual fibers. Further processing the non-woven is also disclosed.Type: ApplicationFiled: January 24, 2011Publication date: July 28, 2011Applicant: LUBRIZOL ADVANCED MATERIALS, INC.Inventors: Ravi R. Vedula, James E. Bryson, JR., Mouh-Wahng Lee
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Publication number: 20100325782Abstract: Elastic fibers are disclosed which have a relatively flat modulus curve at between 100% and 200% elongation. The fibers can be made into garments having a very comfortable feel. The preferred elastic fibers are made from thermoplastic polyurethane polymers and are made by a unique melt spinning process where the fiber is wound into bobbins at a speed just slightly higher than the melt velocity of the polymer exiting the spinneret.Type: ApplicationFiled: June 24, 2010Publication date: December 30, 2010Applicant: LUBRIZOL ADVANCED MATERIALS, INC.Inventors: Ravi R. Vedula, James E. Bryson, JR., Mouh-Wahng Lee, Daniel M. Fischer, Christopher A. Sprague
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Patent number: 7799255Abstract: Articles such as melt spun elastic tape and heaving denier monofilament fibers are made from thermoplastic polyurethane (TPU) polymers. The process to make the articles involves using a substantially horizontal cooling to cool the melt spun articles. Preferably, the cooling is accomplished by a water bath. A crosslinking agent is added to the TPU polymer melt to enhance the elastic properties of the articles.Type: GrantFiled: June 29, 2004Date of Patent: September 21, 2010Assignee: Lubrizol Advanced Materials, Inc.Inventors: Ravi R. Vedula, Yona Eckstein, Yinbing Xia, Stanley J. Nerderman
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Patent number: 7763351Abstract: Articles such as melt spun elastic tape and heaving denier monofilament fibers are made from thermoplastic polyurethane (TPU) polymers. The process to make the articles involves using a substantially horizontal cooling to cool the melt spun articles. Preferably, the cooling is accomplished by a water bath. A crosslinking agent is added to the TPU polymer melt to enhance the elastic properties of the articles.Type: GrantFiled: April 24, 2008Date of Patent: July 27, 2010Assignee: Lubrizol Advanced Materials, Inc.Inventors: Ravi R. Vedula, Yona Eckstein, Yinbing Xia, Stanley J. Nerderman