Patents by Inventor Cletus N. Welch
Cletus N. Welch 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: 6998072Abstract: Described is a polymerizable composition of a photochromic amount of at least one photochromic compound, at least one material having at least one carbonate group and at least one hydroxyl group, and at least one monoisocyanate containing material having at least one unsaturated group. The polymerizable composition optionally contains copolymerizable monomers. Also described are photochromic polymerizates, e.g., photochromic optical elements such as ophthalmic lenses, prepared from the polymerizable composition of the present invention.Type: GrantFiled: October 16, 2002Date of Patent: February 14, 2006Assignee: Transitions Optical, Inc.Inventors: Cletus N. Welch, Eric M. King, Lawrence G. Anderson, Randy E. Daughenbaugh, Kevin J. Stewart
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Patent number: 6916537Abstract: Described is a photochromic article that includes a substrate and at least a partial coating of an at least partially cured polymerizable composition of a photochromic amount of at least one photochromic compound, at least one material having at least one carbonate group and at least one hydroxyl group, and at least one monoisocyanate containing material having at least one unsaturated group. Also described are photochromic optical elements such as ophthalmic lenses, prepared from an optical element substrate coated with the photochromic polymerizable composition.Type: GrantFiled: October 16, 2002Date of Patent: July 12, 2005Assignee: Transitions Optical Inc.Inventors: Cletus N. Welch, Eric M. King, Lawrence G. Anderson, Randy E. Daughenbaugh, Kevin J. Stewart
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Patent number: 6602603Abstract: Described are articles having a photochromic poly(meth)acrylic coating The coatings exhibit a Fischer microhardness of from 50 to 150 Newtons per mm2 and improved photochromic performance properties, i.e., the formation of darker activated colors and faster rates of photochromic activation and fade when irradiated with ultraviolet light.Type: GrantFiled: September 4, 2001Date of Patent: August 5, 2003Assignee: PPG Industries Ohio, Inc.Inventors: Cletus N. Welch, Robert W. Walters, David T. McKeough, Eric M. King
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Publication number: 20030143404Abstract: Described is a photochromic article that includes a substrate and at least a partial coating of an at least partially cured polymerizable composition of a photochromic amount of at least one photochromic compound, at least one material having at least one carbonate group and at least one hydroxyl group, and at least one monoisocyanate containing material having at least one unsaturated group. Also described are photochromic optical elements such as ophthalmic lenses, prepared from an optical element substrate coated with the photochromic polymerizable composition.Type: ApplicationFiled: October 16, 2002Publication date: July 31, 2003Inventors: Cletus N. Welch, Eric M. King, Lawrence G. Anderson, Randy E. Daughenbaugh, Kevin J. Stewart
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Publication number: 20030136948Abstract: Described is a polymerizable composition of a photochromic amount of at least one photochromic compound, at least one material having at least one carbonate group and at least one hydroxyl group, and at least one monoisocyanate containing material having at least one unsaturated group. The polymerizable composition optionally contains copolymerizable monomers. Also described are photochromic polymerizates, e.g., photochromic optical elements such as ophthalmic lenses, prepared from the polymerizable composition of the present invention.Type: ApplicationFiled: October 16, 2002Publication date: July 24, 2003Inventors: Cletus N. Welch, Eric M. King, Lawrence G. Anderson, Randy E. Daughenbaugh, Kevin J. Stewart
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Patent number: 6506488Abstract: Described are articles having an aminoplast resin photochromic coating prepared from an aminoplast resin, components(s) having hydroxyl functional groups and photochromic substances. The coatings exhibit a Fischer microhardness of from 45 to 180 Newtons per mm2 and desirable photochromic properties, i.e., the formation of darker activated colors and faster rates of photochromic activation and fade when irradiated with ultraviolet light. Also described are photochromic aminoplast resin articles.Type: GrantFiled: November 24, 1999Date of Patent: January 14, 2003Assignee: PPG Industries Ohio, Inc.Inventors: Kevin J. Stewart, Jeanine A. Conklin, Cletus N. Welch, James B. O'Dwyer, Shanti Swarup
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Patent number: 6436525Abstract: Described are articles having a polyanhydride photochromic coating. The coatings exhibit a Fischer microhardness of from 50 to 130 Newtons per mm2 and desirable photochromic properties, i.e., the formation of darker activated colors and faster rates of photochromic activation and fade when irradiated with ultraviolet light. Also described are polyanhydride photochromic articles.Type: GrantFiled: December 11, 1998Date of Patent: August 20, 2002Assignee: PPG Industries Ohio, Inc.Inventors: Cletus N. Welch, Robert W. Walters, Shanti Swarup
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Patent number: 6432544Abstract: Described are articles having an aminoplast resin photochromic coating prepared from an aminoplast resin, component(s) having at least two different functional groups and photochromic substances. The coatings exhibit a Fischer microhardness of from 45 to 180 Newtons per mm2 and desirable photochromic properties, i.e., the formation of darker activated colors and faster rates of photochromic activation and fade when irradiated with ultraviolet light. Also described are photochromic aminoplast resin articles.Type: GrantFiled: November 24, 1999Date of Patent: August 13, 2002Assignee: PPG Industries Ohio, Inc.Inventors: Kevin J. Stewart, Jeanine A. Conklin, Cletus N. Welch, James B. O'Dwyer, Shanti Swarup
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Publication number: 20020076549Abstract: Described are articles having a photochromic poly(meth)acrylic coating The coatings exhibit a Fischer microhardness of from 50 to 150 Newtons per mm2 and improved photochromic performance properties, i.e., the formation of darker activated colors and faster rates of photochromic activation and fade when irradiated with ultraviolet light.Type: ApplicationFiled: September 4, 2001Publication date: June 20, 2002Inventors: Cletus N. Welch, Robert W. Walters, David T. McKeough, Eric M. King
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Publication number: 20020009599Abstract: Described are photochromic polyurethane coatings having improved durability as demonstrated by reduced swelling upon exposure to alcoholic solvents in the Percent Swelling Test. The coatings are prepared using polycarbonate polyols alone or in combination with different polyols as the source of hydroxyl groups. Also described are articles having such coatings. The coatings exhibit a Fischer microhardness of from 50 to 150 Newtons per mm2 and good photochromic properties.Type: ApplicationFiled: January 8, 2001Publication date: January 24, 2002Inventors: Cletus N. Welch, Jessica A. Hoch, Jeanine A. Conklin, Shanti Swarup
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Patent number: 6268055Abstract: Described are photochromic epoxy resin coatings that meet commercially acceptable “cosmetic” standards for optical coatings. Also described are articles having such coatings. The coatings exhibit a Fischer microhardness of from 50 to 150 Newtons per mm2 and desirable photochromic properties, i.e., the formation of darker activated colors and faster rates of photochromic activation and fade when irradiated with ultraviolet light.Type: GrantFiled: November 6, 1998Date of Patent: July 31, 2001Assignee: PPG Industries Ohio, Inc.Inventors: Robert W. Walters, Cletus N. Welch, John W. Burgman, Debra L. Singer, Shanti Swarup
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Patent number: 6060001Abstract: Described are articles having an alkoxyacrylamide photochromic coating. The coatings exhibit a Fischer microhardness of from 50 to 130 Newtons per mm.sup.2 and desirable photochromic properties, i.e., the formation of darker activated colors and faster rates of photochromic activation and fade when irradiated with ultraviolet light. Also described are alkoxyacrylamide photochromic articles.Type: GrantFiled: December 14, 1998Date of Patent: May 9, 2000Assignee: PPG Industries Ohio, Inc.Inventors: Cletus N. Welch, Shanti Swarup
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Patent number: 5391327Abstract: Photochromic optical articles of improved resistance to light fatigue are provided by the use of a combination of hindered amine light stabilizer and asymmetric diaryloxalamide light stabilizer with a mixture of (1) photochromic material having a minima luminous transmission in the range of 560 to 630 nanometers and (2) photochromic material having a minima luminous transmission in the range of 430 to 520 nanometers.Type: GrantFiled: June 9, 1994Date of Patent: February 21, 1995Assignee: Transitions Optical, Inc.Inventors: John S. Ligas, Michael S. Misura, Jr., Cletus N. Welch
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Patent number: 5185390Abstract: A process for incorporating by thermal diffusion a photochromic substance into a synthetic organic host material is described. In the process, a surface of the host material containing a coating of a resin composition of from about 5 to about 50 parts of hydroxy (C.sub.2 -C.sub.3) alkyl cellulose, e.g., hydroxy propyl cellulose, and from about 95 to about 50 parts of poly(vinylpyrrolidone), which resin composition contains a photochromic substance, is heated to diffuse at least a portion of the photochromic substance into the surface of the host material. Subsequently, the coating is removed by washing with warm soapy water. In a particular embodiment, the host material is a polymer prepared from diethylene glycol bis(allyl carbonate).Type: GrantFiled: December 6, 1991Date of Patent: February 9, 1993Assignee: PPG Industries, Inc.Inventors: Scott Fischer, Cletus N. Welch
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Patent number: 5130353Abstract: A process for incorporating by thermal diffusion a photochromic substance into a synthetic organic host material is described. In the process, a surface of the host material containing a coating of a resin composition of from about 5 to about 50 parts of hydroxy (C.sub.2 -C.sub.3) alkyl cellulose, e.g., hydroxy propyl cellulose, and from about 95 to about 50 parts of poly(vinylpyrrolidone), which resin composition contains a photochromic substance, is heated to diffuse at least a portion of the photochromic substance into the surface of the host material. Subsequently, the coating is removed by washing with warm soapy water. In a particular embodiment, the host material is a polymer prepared from diethylene glycol bis(allyl carbonate).Type: GrantFiled: March 7, 1990Date of Patent: July 14, 1992Assignee: PPG Industries, Inc.Inventors: Scott Fischer, Cletus N. Welch
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Patent number: 4880667Abstract: Described is a method for imparting a photochromic response to a synthetic plastic article, e.g., an optical lens such as a sunglass lens prepared from an allyl diglycol carbonate monomer. The method described comprises depositing a thin uniform substantially dry film of a photochromic-bearing polymeric resin onto at least one planar surface of the synthetic plastic material, heating the plastic article and resin film substantially uniformly at temperatures near to but below the melting temperature of the photochromic substance for a time sufficient to transfer a photochromic amount of the photochromic material into the subsurface region of the plastic article, and thereafter removing the photochromic-lean resin film from the planar surface(s) of the plastic article.Type: GrantFiled: October 15, 1987Date of Patent: November 14, 1989Assignee: PPG Industries, Inc.Inventor: Cletus N. Welch
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Patent number: 4675357Abstract: Disclosed is a near infrared absorbing polymerizate prepared from bis(allyl carbonate) monomer containing the reaction product of tungsten hexachloride and phenolic compounds.Type: GrantFiled: May 29, 1984Date of Patent: June 23, 1987Assignee: PPG Industries, Inc.Inventor: Cletus N. Welch
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Patent number: 4396473Abstract: Discloses a cathode having a porous surface prepared by electro arc spray metallization of two wires of a leachable metal and a catalytic metal onto a substrate, and removal of the leachable metal. Also discloses method of preparing the cathode, and an electrolytic process using the cathode.Type: GrantFiled: April 29, 1981Date of Patent: August 2, 1983Assignee: PPG Industries, Inc.Inventors: Gary N. Hughes, Cletus N. Welch
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Patent number: 4390512Abstract: A continuous integrated process for the production of neutral calcium hypochlorite in which crystals of by-product sodium chloride are more easily separated from the calcium hypochlorite product is described. The process includes diluting an aqueous slurry of sodium hydroxide, lime and bleach mother liquor with aqueous salt solution saturated with calcium ion and sodium chloride and chlorinating the resulting aqueous admixture in the presence of a seed bed of sodium chloride crystals and calcium hypochlorite crystals at temperatures less than 35.degree. C., e.g., 15.degree.-20.degree. C. A suspension of readily separable, sodium chloride crystals and calcium hypochlorite crystals in chlorinator liquor is conveyed to a classification zone where the sodium chloride and calcium hypochlorite crystals are separated.Type: GrantFiled: February 22, 1982Date of Patent: June 28, 1983Assignee: PPG Industries, Inc.Inventors: Clifford E. Loehr, Roger A. Crawford, John E. Carbaugh, Cletus N. Welch
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Patent number: 4328200Abstract: A continuous integrated process for the production of calcium hypochlorite in which crystals of by-product sodium chloride are more easily separated for the calcium hypochlorite product is described. The process includes: (a) introducing with agitation into a vessel an aqueous slurry of dibasic calcium hypochlorite, sodium hydroxide, and aqueous salt solution saturated with calcium ion and sodium chloride in amounts at least sufficient to substantially dilute the sodium hydroxide; (b) forwarding the resulting aqueous mixture of step (a) to a chlorination zone containing a seed bed of calcium hypochlorite and sodium chloride crystals; (c) introducing chlorine into the chlorination zone, thereby producing an aqueous suspension containing further quantities of calcium hypochlorite crystals and readily separable significantly larger sodium chloride crystals; and (d) removing aqueous suspension containing such calcium hypochlorite and sodium chloride crystals from the chlorination zone to a classification zone.Type: GrantFiled: June 1, 1981Date of Patent: May 4, 1982Assignee: PPG Industries, Inc.Inventors: Cletus N. Welch, Clifford E. Loehr, Roger A. Crawford, John E. Carbaugh