Patents by Inventor Charles Fletcher Nelson
Charles Fletcher Nelson 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: 6678914Abstract: A thermoplastic polymer monofilament oriented from 3.0-6.0 times its original length having a diameter of 125-600 microns and containing 0.2-5.0% by weight, based on the weight of the monofilament, of glitter particles or film particles having a particle size of 50-400 microns in its longest diameter, a thickness of 2-50 microns and having a diameter to thickness ratio of at least 2 to 1 and wherein the longest diameter of the particle is not greater than 80% of the diameter of the monofilament and that provide the monofilament with an attractive appearance. A core sheath monofilament is also part of this invention wherein the core is a thermoplastic polymer monofilament having a sheath of the same or different thermoplastic polymer containing the above described particles. These monofilaments are particularly useful in toothbrushes and cosmetic brushes.Type: GrantFiled: April 16, 2002Date of Patent: January 20, 2004Assignee: E. I. du Pont de Nemours and CompanyInventors: Michael Christopher Needham, Charles Fletcher Nelson, David James Ruffin
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Publication number: 20020148060Abstract: A thermoplastic polymer monofilament oriented from 3.0-6.0 times its original length having a diameter of 125-600 microns and containing 0.2-5.0% by weight, based on the weight of the monofilament, of glitter particles or film particles having a particle size of 50-400 microns in its longest diameter, a thickness of 2-50 microns and having a diameter to thickness ratio of at least 2 to 1 and wherein the longest diameter of the particle is not greater than 80% of the diameter of the monofilament and that provide the monofilament with an attractive appearance. A core sheath monofilament is also part of this invention wherein the core is a thermoplastic polymer monofilament having a sheath of the same or different thermoplastic polymer containing the above described particles. These monofilaments are particularly useful in toothbrushes and cosmetic brushes.Type: ApplicationFiled: April 16, 2002Publication date: October 17, 2002Inventors: Michael Christopher Needham, Charles Fletcher Nelson, David James Ruffin
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Patent number: 6399196Abstract: A thermoplastic polymer monofilament oriented from 3.0-6.0 times its original length having a diameter of 125-600 microns and containing 0.2-5.0% by weight, based on the weight of the monofilament, of glitter particles or film particles having a particle size of 50-400 microns in its longest diameter, a thickness of 2-50 microns and having a diameter to thickness ratio of at least 2 to 1 and wherein the longest diameter of the particle is not greater than 80% of the diameter of the monofilament and that provide the monofilament with an attractive appearance. A core sheath monofilament is also part of this invention wherein the core is a thermoplastic polymer monofilament having a sheath of the same or different thermoplastic polymer containing the above described particles. These monofilaments are particularly useful in toothbrushes and cosmetic brushes.Type: GrantFiled: May 24, 2001Date of Patent: June 4, 2002Assignee: E. I. du Pont de Nemours & CompanyInventors: Michael Christopher Needham, Charles Fletcher Nelson, David James Ruffin
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Publication number: 20010034918Abstract: A thermoplastic polymer monofilament oriented from 3.0-6.0 times its original length having a diameter of 125-600 microns and containing 0.2-5.0% by weight, based on the weight of the monofilament, of glitter particles or film particles having a particle size of 50-400 microns in its longest diameter, a thickness of 2-50 microns and having a diameter to thickness ratio of at least 2 to 1 and wherein the longest diameter of the particle is not greater than 80% of the diameter of the monofilament and that provide the monofilament with an attractive appearance. A core sheath monofilament is also part of this invention wherein the core is a thermoplastic polymer monofilament having a sheath of the same or different thermoplastic polymer containing the above described particles. These monofilaments are particularly useful in toothbrushes and cosmetic brushes.Type: ApplicationFiled: May 24, 2001Publication date: November 1, 2001Inventors: Michael Christopher Needham, Charles Fletcher Nelson, David James Ruffin
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Patent number: 6296934Abstract: A thermoplastic polymer monofilament oriented from 3.0-6.0 times its original length having a diameter of 125-600 microns and containing 0.2-5.0% by weight, based on the weight of the monofilament, of glitter particles or film particles having a particle size of 50-400 microns in its longest diameter, a thickness of 2-50 microns and having a diameter to thickness ratio of at least 2 to 1 and wherein the longest diameter of the particle is not greater than 80% of the diameter of the monofilament and that provide the monofilament with an attractive appearance. A core sheath monofilament is also part of this invention wherein the core is a thermoplastic polymer monofilament having a sheath of the same or different thermoplastic polymer containing the above described particles. These monofilaments are particularly useful in toothbrushes and cosmetic brushes.Type: GrantFiled: March 12, 1999Date of Patent: October 2, 2001Assignee: E.I. du Pont de Nemours and CompanyInventors: Michael Christopher Needham, Charles Fletcher Nelson, David James Ruffin
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Patent number: 6270895Abstract: A thermoplastic polymer monofilament oriented from 3.0-6.0 times its original length having a diameter of 125-600 microns and containing 0.2-5.0% by weight, based on the weight of the monofilament, of glitter particles or film particles having a particle size of 50-400 microns in its longest diameter, a thickness of 2-50 microns and having a diameter to thickness ratio of at least 2 to 1 and wherein the longest diameter of the particle is not greater than 80% of the diameter of the monofilament and that provide the monofilament with an attractive appearance. A core sheath monofilament is also part of this invention wherein the core is a thermoplastic polymer monofilament having a sheath of the same or different thermoplastic polymer containing the above described particles. These monofilaments are particularly useful in toothbrushes and cosmetic brushes.Type: GrantFiled: August 3, 2000Date of Patent: August 7, 2001Assignee: E.I. du Pont de Nemours and CompanyInventors: Michael Christopher Needham, Charles Fletcher Nelson, David James Ruffin
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Patent number: 5849410Abstract: This invention relates to a coextruded monofilament having a sheath made of a first resin and a core made of a second resin which is different than the first resin and which has a higher coefficient of friction than the first resin. The core of the monofilament is exposed at the tip by conventional mechanical end-rounding techniques to form a tip with a higher coefficient of friction than the tip of a typical monofilament.Type: GrantFiled: December 12, 1996Date of Patent: December 15, 1998Assignee: E. I. du Pont de Nemours and CompanyInventors: Charles Fletcher Nelson, Robert Lee Rackley
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Patent number: 5770307Abstract: This invention relates to a coextruded monofilament having a core material made of a first resin and a sheath material made of a second resin, with the second resin being different from the first resin, and a pocket formed in the end of the monofilament. This invention also relates to a method of forming a pocket in the end of a coextruded monofilament by chemical or mechanical means, or a combination of chemical and mechanical means.Type: GrantFiled: September 27, 1996Date of Patent: June 23, 1998Assignee: E. I. du Pont de Nemours and CompanyInventors: Robert Lee Rackley, Charles Fletcher Nelson