Patents by Inventor John Cavanaugh
John Cavanaugh 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).
-
Patent number: 8937112Abstract: An aqueous fluoropolymer dispersion comprising fluoropolymer particles having an average particle size of about 10 to about 400 nm. The dispersion has a solids content of at least about 35 to about 70 wt % and comprises about 0.03 wt % to about 10 wt % anionic polyelectrolyte dispersing agent based on the weight of fluoropolymer solids. The dispersion has a Gel Time of at least about 100 seconds.Type: GrantFiled: August 20, 2013Date of Patent: January 20, 2015Assignee: E I du Pont de Nemours and CompanyInventors: Robert John Cavanaugh, Clay Woodward Jones
-
Publication number: 20130338298Abstract: An aqueous fluoropolymer dispersion comprising fluoropolymer particles having an average particle size of about 10 to about 400 nm. The dispersion has a solids content of at least about 35 to about 70 wt % and comprises about 0.03 wt % to about 10 wt % anionic polyelectrolyte dispersing agent based on the weight of fluoropolymer solids. The dispersion has a Gel Time of at least about 100 seconds.Type: ApplicationFiled: August 20, 2013Publication date: December 19, 2013Applicant: E.I. DU PONT DE NEMOURS AND COMPANYInventors: ROBERT JOHN CAVANAUGH, CLAY WOODWARD JONES
-
Patent number: 8329836Abstract: A stabilized aqueous fluoropolymer dispersion comprising fluoropolymer particles, wherein the dispersion contains less that about 300 ppm fluorosurfactant based on the weight of the dispersion and a cationic surfactant. The cationic surfactant aids in reducing the viscosity of the dispersion and preferred cationic surfactants are volatile in coating or film casting operations involving drying and sintering of the dispersion.Type: GrantFiled: July 13, 2009Date of Patent: December 11, 2012Assignee: E I du Pont de Nemours and CompanyInventor: Robert John Cavanaugh
-
Patent number: 7985361Abstract: A process for dispersion spinning non-melt-processible fluoropolymer fiber in which a mixture of an aqueous dispersion of non-melt-processible polytetrafluoroethylene or modified polytetrafluoroethylene fluoropolymer particles and an aqueous solution of matrix polymer is formed. The non melt-processible particles have an SSG of less than about 2.40. The aqueous dispersion contains an aliphatic alcohol ethoxylate nonionic surfactant having a 20% residuals temperature determined by thermogravimetric analysis (TGA) of less than about 290° C. and is essentially free of surfactants containing aromatic groups. The dispersion has a fluorinated surfactant content of less than about 300 ppm. The mixture is extruded into a coagulation bath containing a concentration of ions which coagulate the matrix polymer to form an intermediate fiber structure. The intermediate fiber structure is sintered to decompose the matrix polymer and coalesce.Type: GrantFiled: May 21, 2008Date of Patent: July 26, 2011Assignee: E. I. du Pont de Nemours and CompanyInventors: Devin Flowers, Clay Woodward Jones, Robert John Cavanaugh
-
Patent number: 7931942Abstract: The present invention provides a process for making a filled fluoropolymer bearing comprising providing an aqueous fluoropolymer dispersion comprising fluoropolymer particles and anionic polyelectrolyte dispersing agent in an amount sufficient for stabilization. The dispersion contains less than about 300 ppm fluorosurfactant based on the weight of the dispersion. The dispersion is coagulated to make a mush and a bearing filler is added to the dispersion prior to or after making the mush. The mush containing bearing filler is applied onto a bearing substrate to produce a coated substrate which is sintered and formed into a bearing.Type: GrantFiled: June 2, 2010Date of Patent: April 26, 2011Assignee: E. I. du Pont de Nemours and CompanyInventors: Robert John Cavanaugh, Clay Woodward Jones
-
Patent number: 7914853Abstract: The present invention provides a process for making a filled fluoropolymer bearing comprising providing an aqueous fluoropolymer dispersion comprising fluoropolymer particles and anionic polyelectrolyte dispersing agent in an amount sufficient for stabilization. The dispersion contains less than about 300 ppm fluorosurfactant based on the weight of the dispersion. The dispersion is coagulated to make a mush and a bearing filler is added to the dispersion prior to or after making the mush. The mush containing bearing filler is applied onto a bearing substrate to produce a coated substrate which is sintered and formed into a bearing.Type: GrantFiled: June 2, 2010Date of Patent: March 29, 2011Assignee: E.I. du Pont de Nemours and CompanyInventors: Robert John Cavanaugh, Clay Woodward Jones
-
Patent number: 7871673Abstract: The present invention provides a process for making a filled fluoropolymer bearing comprising providing an aqueous fluoropolymer dispersion comprising fluoropolymer particles and anionic polyelectrolyte dispersing agent in an amount sufficient for stabilization. The dispersion contains less than about 300 ppm fluorosurfactant based on the weight of the dispersion. The dispersion is coagulated to make a mush and a bearing filler is added to the dispersion prior to or after making the mush. The mush containing bearing filler is applied onto a bearing substrate to produce a coated substrate which is sintered and formed into a bearing.Type: GrantFiled: June 2, 2010Date of Patent: January 18, 2011Assignee: E. I. du Pont de Nemours and CompanyInventors: Robert John Cavanaugh, Clay Woodward Jones
-
Publication number: 20100239769Abstract: The present invention provides a process for making a filled fluoropolymer bearing comprising providing an aqueous fluoropolymer dispersion comprising fluoropolymer particles and anionic polyelectrolyte dispersing agent in an amount sufficient for stabilization. The dispersion contains less than about 300 ppm fluorosurfactant based on the weight of the dispersion. The dispersion is coagulated to make a mush and a bearing filler is added to the dispersion prior to or after making the mush. The mush containing bearing filler is applied onto a bearing substrate to produce a coated substrate which is sintered and formed into a bearing.Type: ApplicationFiled: June 2, 2010Publication date: September 23, 2010Applicant: E. I DU PONT DE NEMOURS AND COMPANYInventors: Robert John Cavanaugh, Clay Woodward Jones
-
Publication number: 20100239768Abstract: The present invention provides a process for making a filled fluoropolymer bearing comprising providing an aqueous fluoropolymer dispersion comprising fluoropolymer particles and anionic polyelectrolyte dispersing agent in an amount sufficient for stabilization. The dispersion contains less than about 300 ppm fluorosurfactant based on the weight of the dispersion. The dispersion is coagulated to make a mush and a bearing filler is added to the dispersion prior to or after making the mush. The mush containing bearing filler is applied onto a bearing substrate to produce a coated substrate which is sintered and formed into a bearing.Type: ApplicationFiled: June 2, 2010Publication date: September 23, 2010Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: Robert John Cavanaugh, Clay Woodward Jones
-
Publication number: 20100239770Abstract: The present invention provides a process for making a filled fluoropolymer bearing comprising providing an aqueous fluoropolymer dispersion comprising fluoropolymer particles and anionic polyelectrolyte dispersing agent in an amount sufficient for stabilization. The dispersion contains less than about 300 ppm fluorosurfactant based on the weight of the dispersion. The dispersion is coagulated to make a mush and a bearing filler is added to the dispersion prior to or after making the mush. The mush containing bearing filler is applied onto a bearing substrate to produce a coated substrate which is sintered and formed into a bearing.Type: ApplicationFiled: June 2, 2010Publication date: September 23, 2010Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: Robert John Cavanaugh, Clay Woodward Jones
-
Patent number: 7754287Abstract: The present invention provides a process for making a filled fluoropolymer bearing comprising providing an aqueous fluoropolymer dispersion comprising fluoropolymer particles and anionic polyelectrolyte dispersing agent in an amount sufficient for stabilization. The dispersion contains less than about 300 ppm fluorosurfactant based on the weight of the dispersion. The dispersion is coagulated to make a mush and a bearing filler is added to the dispersion prior to or after making the mush. The mush containing bearing filler is applied onto a bearing substrate to produce a coated substrate which is sintered and formed into a bearing.Type: GrantFiled: May 18, 2007Date of Patent: July 13, 2010Assignee: E. I. du Pont de Nemours and CompanyInventors: Robert John Cavanaugh, Clay Woodward Jones
-
Patent number: 7733798Abstract: In one embodiment, a method includes receiving topology data that indicates multiple communication links and multiple intermediate network nodes in communication based on the communication links. The intermediate network nodes include multiple leaf nodes that terminate communications and multiple transit nodes that facilitate the passage of information between leaf nodes. Aggregation point data is also received, which indicates all aggregation points on the intermediate network nodes. An aggregation point is an interface between a network node and a communication link, through which is output data that is a combination of data received through multiple different interfaces upstream of the interface. A set of paths is determined for which each path in the set connects a different pair of leaf nodes. A measure of aggregation is determined based on a number of aggregated paths of the set of paths. An aggregated path passes through an aggregation point.Type: GrantFiled: August 28, 2007Date of Patent: June 8, 2010Assignee: Cisco Technology, Inc.Inventors: Russell White, Alvaro Retana, Bruce Pinsky, John Cavanaugh, Mosaddaq Turabi
-
Patent number: 7666928Abstract: A process for reducing fluorosurfactant content of a fluorosurfactant-containing aqueous fluoropolymer dispersion stabilized with nonionic surfactant. The process includes reducing the fluorosurfactant content of the stabilized fluorosurfactant-containing aqueous fluoropolymer dispersion to a predetermined level to provide a reduced surfactant dispersion, adding non-fluorinated anionic surfactant to the reduced fluorosurfactant dispersion, and concentrating the reduced fluorosurfactant dispersion. The non-fluorinated anionic surfactant is added in stages wherein a first portion is added to the dispersion prior to concentrating and a second portion of the non-fluorinated anionic surfactant is added to the dispersion after concentrating.Type: GrantFiled: May 22, 2007Date of Patent: February 23, 2010Assignee: E.I. du Pont de Nemours and CompanyInventors: David William Johnson, Robert John Cavanaugh
-
Patent number: 7619039Abstract: An aqueous dispersion of non-melt-processible fluoropolymer, process for making same and concentrated dispersion and powder obtained from the dispersion. The fluoropolymer particles of the dispersion have a standard specific gravity (SSG) of less than 2.225 and comprise a core of high molecular weight polytetrafluoroethylene and a shell of lower molecular weight polytetrafluoroethylene or modified polytetrafluoroethylene. At least about 1.5 weight % of the fluoropolymer particles comprise substantially rod-shaped particles having a length to diameter ratio greater than about 5.Type: GrantFiled: April 19, 2006Date of Patent: November 17, 2009Assignee: E. I. du Pont de Nemours and CompanyInventors: Clay Woodward Jones, Robert John Cavanaugh, Walter Thomas Krakowiak, Richard A. Morgan, Theodore A. Treat
-
Patent number: 7619018Abstract: A process for reducing fluorosurfactant content of a stabilized fluorosurfactant-containing aqueous fluoropolymer dispersion containing ferric ions by contacting the fluoropolymer dispersion with strong base anion exchange resin to reduce fluorosurfactant content to a predetermined level, the anion exchange resin being in the hydroxide form, separating the dispersion from the anion exchange resin, and adding an effective amount of chelating agent having an equilibrium constant when complexed with iron of at least 1018 prior to the contacting with the ion exchange resin for complexing ferric ions to prevent scum formation.Type: GrantFiled: December 2, 2005Date of Patent: November 17, 2009Assignee: E.I. du Pont de Nemours and CompanyInventors: David William Johnson, Robert John Cavanaugh
-
Publication number: 20090275693Abstract: A stabilized aqueous fluoropolymer dispersion comprising fluoropolymer particles, wherein the dispersion contains less that about 300 ppm fluorosurfactant based on the weight of the dispersion and a cationic surfactant. The cationic surfactant aids in reducing the viscosity of the dispersion and preferred cationic surfactants are volatile in coating or film casting operations involving drying and sintering of the dispersion.Type: ApplicationFiled: July 13, 2009Publication date: November 5, 2009Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventor: Robert John Cavanaugh
-
Publication number: 20090059925Abstract: In one embodiment, a method includes receiving topology data that indicates multiple communication links and multiple intermediate network nodes in communication based on the communication links. The intermediate network nodes include multiple leaf nodes that terminate communications and multiple transit nodes that facilitate the passage of information between leaf nodes. Aggregation point data is also received, which indicates all aggregation points on the intermediate network nodes. An aggregation point is an interface between a network node and a communication link, through which is output data that is a combination of data received through multiple different interfaces upstream of the interface. A set of paths is determined for which each path in the set connects a different pair of leaf nodes. A measure of aggregation is determined based on a number of aggregated paths of the set of paths. An aggregated path passes through an aggregation point.Type: ApplicationFiled: August 28, 2007Publication date: March 5, 2009Inventors: Russell WHITE, Alvaro Retana, Bruce Pinsky, John Cavanaugh, Mosaddaq Turabi
-
Publication number: 20080221250Abstract: A process for dispersion spinning non-melt-processible fluoropolymer fiber in which a mixture of an aqueous dispersion of non-melt-processible polytetrafluoroethylene or modified polytetrafluoroethylene fluoropolymer particles and an aqueous solution of matrix polymer is formed. The non melt-processible particles have an SSG of less than about 2.40. The aqueous dispersion contains an aliphatic alcohol ethoxylate nonionic surfactant having a 20% residuals temperature determined by thermogravimetric analysis (TGA) of less than about 290° C. and is essentially free of surfactants containing aromatic groups. The dispersion has a fluorinated surfactant content of less than about 300 ppm. The mixture is extruded into a coagulation bath containing a concentration of ions which coagulate the matrix polymer to form an intermediate fiber structure. The intermediate fiber structure is sintered to decompose the matrix polymer and coalesce.Type: ApplicationFiled: May 21, 2008Publication date: September 11, 2008Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: Devin Flowers, Clay Woodward Jones, Robert John Cavanaugh
-
Patent number: 7390448Abstract: A process for dispersion spinning non-melt-processible fluoropolymer fiber in which a mixture of an aqueous dispersion of non-melt-processible polytetrafluoroethylene or modified polytetrafluoroethylene fluoropolymer particles and an aqueous solution of matrix polymer is formed. The non melt-processible particles have an SSG of less than about 2.40. The aqueous dispersion contains an aliphatic alcohol ethoxylate nonionic surfactant having a 20% residuals temperature determined by thermogravimetric analysis (TGA) of less than about 290° C. and is essentially free of surfactants containing aromatic groups. The dispersion has a fluorinated surfactant content of less than about 300 ppm. The mixture is extruded into a coagulation bath containing a concentration of ions which coagulate the matrix polymer to form an intermediate fiber structure. The intermediate fiber structure is sintered to decompose the matrix polymer and coalesce.Type: GrantFiled: July 28, 2006Date of Patent: June 24, 2008Assignee: E.I. du Pont de Nemours and CompanyInventors: Devin Flowers, Clay Woodward Jones, Robert John Cavanaugh
-
Patent number: 7321766Abstract: There are disclosed systems and methods for performing diagnostic testing on portable communication devices, such as cellular telephones. In one embodiment, diagnostic commands are generated internal to the communication device and processed within the device as though the test commands had been received from a remote location. The processed commands can be analyzed either within the portable device or remote therefrom. For remote processing, a wireless port is provided.Type: GrantFiled: January 21, 2003Date of Patent: January 22, 2008Assignee: Agilent Technologies, IncInventors: Jerry J. Liu, Thomas M. Snyder, John Cavanaugh