Patents by Inventor David A. Grewell
David A. Grewell 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: 11214714Abstract: The present invention relates to an adhesive comprising a thermoplastic polyacrylated glycerol polymer, water, and a cross linker that is reactive with the polyacrylated glycerol polymer. This adhesive is useful in the formation of cellulosic products including oriented strand board (OSB), particle board, oriented structural straw board, chipboard, plywood, laminated veneer lumber (LVL), pressed wood, glued laminated timber (glulam), cross-laminated timber (CLT), and other wood products. Methods of producing the adhesive and cellulosic products are also disclosed.Type: GrantFiled: May 7, 2019Date of Patent: January 4, 2022Assignees: IOWA STATE UNIVERSITY RESEARCH FOUNDATION, INC., MIDWEST ACRYLATED PROCESSES, LLCInventors: Eric W. Cochran, Nacu B. Hernandez, R. Chris Williams, Michael Forrester, David Grewell, Andrew Becker, Joseph J. Marcinko
-
Publication number: 20190345369Abstract: The present invention relates to an adhesive comprising a thermoplastic polyacrylated glycerol polymer, water, and a cross linker that is reactive with the polyacrylated glycerol polymer. This adhesive is useful in the formation of cellulosic products including oriented strand board (OSB), particle board, oriented structural straw board, chipboard, plywood, laminated veneer lumber (LVL), pressed wood, glued laminated timber (glulam), cross-laminated timber (CLT), and other wood products. Methods of producing the adhesive and cellulosic products are also disclosed.Type: ApplicationFiled: May 7, 2019Publication date: November 14, 2019Inventors: Eric W. COCHRAN, Nacu B. HERNANDEZ, R. Chris WILLIAMS, Michael FORRESTER, David GREWELL, Andrew BECKER, Joseph J. Marcinko
-
Patent number: 10442118Abstract: To better control part quality of 3D printed parts, the temperature of an extruder filament using a secondary heat source is provided. A heat source, such as an infrared heat source, can be used to heat the filament of a 3D printer to the optimum temperature that will enhance welding of the filament to a substrate that it is being printed on or to. Such an optimum temperature can be based upon, in part, the temperature of the substrate. A controller or other intelligent control can be used to receive temperature readings of the substrate and/or filament and then can adjust the temperature of the heating source to optimize the temperature of the filament to better combine the filament to the substrate.Type: GrantFiled: September 29, 2016Date of Patent: October 15, 2019Assignee: Iowa State University Research Foundation, Inc.Inventor: David Grewell
-
Patent number: 9988318Abstract: This invention relates to bio-renewable fertilizer compositions and methods of making and using the bio-renewable fertilizer compositions. In particular, the fertilizer compositions include biodegradable nutrient carriers, which have naturally derived, bio-renewable nitrogen content. The fertilizer compositions also contain biodegradable stabilizer.Type: GrantFiled: October 12, 2015Date of Patent: June 5, 2018Assignee: Iowa State University Research Foundation, Inc.Inventors: James Schrader, William Graves, Jr., David Grewell
-
Publication number: 20170087767Abstract: To better control part quality of 3D printed parts, the temperature of an extruder filament using a secondary heat source is provided. A heat source, such as an infrared heat source, can be used to heat the filament of a 3D printer to the optimum temperature that will enhance welding of the filament to a substrate that it is being printed on or to. Such an optimum temperature can be based upon, in part, the temperature of the substrate. A controller or other intelligent control can be used to receive temperature readings of the substrate and/or filament and then can adjust the temperature of the heating source to optimize the temperature of the filament to better combine the filament to the substrate.Type: ApplicationFiled: September 29, 2016Publication date: March 30, 2017Inventor: David Grewell
-
Publication number: 20160102024Abstract: This invention relates to bio-renewable fertilizer compositions and methods of making and using the bio-renewable fertilizer compositions. In particular, the fertilizer compositions include biodegradable nutrient carriers, which have naturally derived, bio-renewable nitrogen content. The fertilizer compositions also contain biodegradable stabilizer.Type: ApplicationFiled: October 12, 2015Publication date: April 14, 2016Inventors: James Schrader, William Graves, JR., David Grewell
-
Patent number: 8895778Abstract: The invention provides energy efficient depolymerization of polyesters such as post-consumer polylactic acid. Ultrasonic induced implosions can be used to facilitate the depolymerization. The expanding market of polylactic acid-based plastic products, such as water bottles and packaging materials, has raised concerns of contaminating the recycling stream, which is largely filled with petroleum-based plastics. Thus the development of an energy efficient and economically viable PLA recycling process is urgently needed. Post consumer PLA was exposed to methanol as the suspension media in the presence of organic or ionic salts of alkali metals such a potassium carbonate and sodium hydroxide as depolymerization catalysts to provide high quality lactic acid monomers in high yield.Type: GrantFiled: January 24, 2012Date of Patent: November 25, 2014Assignee: Iowa State University Research FoundationInventors: Gowrishankar Srinivasan, David Grewell
-
Publication number: 20130096342Abstract: The invention provides energy efficient depolymerization of polyesters such as post-consumer polylactic acid. Ultrasonic induced implosions can be used to facilitate the depolymerization. The expanding market of polylactic acid-based plastic products, such as water bottles and packaging materials, has raised concerns of contaminating the recycling stream, which is largely filled with petroleum-based plastics. Thus the development of an energy efficient and economically viable PLA recycling process is urgently needed. Post consumer PLA was exposed to methanol as the suspension media in the presence of organic or ionic salts of alkali metals such a potassium carbonate and sodium hydroxide as depolymerization catalysts to provide high quality lactic acid monomers in high yield.Type: ApplicationFiled: January 24, 2012Publication date: April 18, 2013Inventors: Gowrishankar Srinivasan, David Grewell
-
Publication number: 20120321808Abstract: A coating having source from plant protein that is water insoluble and sprayable. The coating is derived from soy protein or other plants and consists of chemistries that promote water stability and insolubility in water. The spraying device for such coating is an aerosol pressure driven system or similar. The coating converts from a liquid to a solid after a length of time which can be accelerated through heating.Type: ApplicationFiled: June 14, 2012Publication date: December 20, 2012Inventors: Roy D. Taylor, David Grewell, Maria Baboi
-
Patent number: 8172969Abstract: A method for ultrasonic debulking a composite laminate includes the steps of defining a path across the laminate, the path having a starting location and an ending location and applying a force to and transmitting ultrasonic vibration into the laminate along the path, beginning at the starting location and ending at the ending location. The method further includes determining a temperature of a surface of the laminate proximate to the path and varying at least one of an amplitude of the ultrasonic vibration, the applied force, a feed rate at which the force and the ultrasonic vibration are applied along the path, an angle at which the ultrasonic vibration is applied to the laminate, and an interval at which plies of the laminate are processed, based upon the determined temperature of the surface of the laminate.Type: GrantFiled: January 25, 2011Date of Patent: May 8, 2012Assignees: Textron Innovations Inc., The Ohio State University Research FoundationInventors: Edward W. Lee, Avraham Benatar, David Grewell
-
Publication number: 20110114247Abstract: A method for ultrasonic debulking a composite laminate includes the steps of defining a path across the laminate, the path having a starting location and an ending location and applying a force to and transmitting ultrasonic vibration into the laminate along the path, beginning at the starting location and ending at the ending location. The method further includes determining a temperature of a surface of the laminate proximate to the path and varying at least one of an amplitude of the ultrasonic vibration, the applied force, a feed rate at which the force and the ultrasonic vibration are applied along the path, an angle at which the ultrasonic vibration is applied to the laminate, and an interval at which plies of the laminate are processed, based upon the determined temperature of the surface of the laminate.Type: ApplicationFiled: January 25, 2011Publication date: May 19, 2011Inventors: Edward W. Lee, Avraham Benatar, David Grewell
-
Patent number: 7892372Abstract: A method for ultrasonic debulking a composite laminate (105) includes the steps of defining a path (115) across the laminate, the path having a starting location and an ending location and applying a force (109) to and transmitting ultrasonic vibration (111) into the laminate along the path, beginning at the starting location and ending at the ending location. The method further includes determining a temperature of a surface (103, 123) of the laminate proximate to the path and varying at least one of an amplitude of the ultrasonic vibration, the applied force, a feed rate at which the force and the ultrasonic vibration are applied along the path, an angle at which the ultrasonic vibration is applied to the laminate, and an interval at which plies of the laminate are processed, based upon the determined temperature of the surface of the laminate.Type: GrantFiled: October 11, 2005Date of Patent: February 22, 2011Assignee: Textron Innovations Inc.Inventors: Edward W. Lee, Avraham Benatar, David Grewell
-
Publication number: 20100176184Abstract: A method of ultrasonic welding aluminum parts together includes placing the aluminum parts in an ultrasonic welding apparatus and contacting at least one of the aluminum parts with a horn tip of a weld horn of the ultrasonic welding apparatus. A weld amplitude is profiled during a weld cycle of the ultrasonic welding apparatus by producing a high weld amplitude above 55 ?m at the horn tip of the weld horn during an initial period of a weld cycle and producing a low weld amplitude below 55 ?m at the horn tip after the initial period.Type: ApplicationFiled: March 24, 2010Publication date: July 15, 2010Applicant: Branson Ultrasonics CorporationInventors: James F. Sheehan, David A. Grewell
-
Publication number: 20080314498Abstract: A method for ultrasonic debulking a composite laminate (105) includes the steps of defining a path (115) across the laminate, the path having a starting location and an ending location and applying a force (109) to and transmitting ultrasonic vibration (111) into the laminate along the path, beginning at the starting location and ending at the ending location. The method further includes determining a temperature of a surface (103, 123) of the laminate proximate to the path and varying at least one of an amplitude of the ultrasonic vibration, the applied force, a feed rate at which the force and the ultrasonic vibration are applied along the path, an angle at which the ultrasonic vibration is applied to the laminate, and an interval at which plies of the laminate are processed, based upon the determined temperature of the surface of the laminate.Type: ApplicationFiled: October 11, 2005Publication date: December 25, 2008Inventors: Edward W. Lee, Avraham Benatar, David Grewell
-
Publication number: 20080054051Abstract: An ultrasonic welding apparatus has a power supply coupled to a weld stack. The weld stack has an ultrasonic transducer coupled to a horn by a booster. The horn has a horn tip. The weld cycle of the ultrasonic welding apparatus is amplitude profiled so that during an initial period, the weld amplitude at the horn tip is high and after the initial period, the weld amplitude is low.Type: ApplicationFiled: August 13, 2007Publication date: March 6, 2008Applicant: Branson Ultrasonics CorporationInventors: James Sheehan, David Grewell
-
Patent number: 6867388Abstract: A laser imaging apparatus having a laser source outputting a laser beam and an electronic display device. The electronic display device is positioned downstream from the laser source. The electronic display device is operable to selectively polarize a discrete portion of the laser beam to define a modified portion and an unmodified portion. A polarizing filter is then positioned downstream from the display device so as to prevent passage of either the modified portion or the unmodified portion of the laser beam therethrough so as to define an imaging beam having a specific pattern.Type: GrantFiled: April 8, 2003Date of Patent: March 15, 2005Assignee: Branson Ultrasonics CorporationInventors: David A. Grewell, Donald C Lovett
-
Publication number: 20040200812Abstract: A laser imaging apparatus having a laser source outputting a laser beam and an electronic display device. The electronic display device is positioned downstream from the laser source. The electronic display device is operable to selectively polarize a discrete portion of the laser beam to define a modified portion and an unmodified portion. A polarizing filter is then positioned downstream from the display device so as to prevent passage of either the modified portion or the unmodified portion of the laser beam therethrough so as to define an imaging beam having a specific pattern.Type: ApplicationFiled: April 8, 2003Publication date: October 14, 2004Inventors: David A. Grewell, Donald C. Lovett
-
Patent number: 6528755Abstract: The present invention is directed to a method and apparatus using a light guide for directing a laser beam to a weld zone. The light guide includes an entrance end, an exit end and a flexible body therebetween. The entrance end of the light guide is operatively coupled to a laser source such as a diode and is adapted to receive and communicate the laser radiation through the light guide. The light guide is formed of a flexible material to permit the exit end of the light guide to be spaced from and aligned with complex two-dimensional and three-dimensional weld zone configurations. The internal reflection of the light guide contains the laser radiation therein as it passes from the entrance end and through the exit end of the light guide. The light guide and corresponding methods of welding parts permit laser welding of complex geometric configurations.Type: GrantFiled: April 10, 2001Date of Patent: March 4, 2003Assignee: Branson Ultrasonics CorporationInventors: David A. Grewell, Justin R. Bickford, Donald C. Lovett, Paul A. Rooney
-
Patent number: 6486433Abstract: An inflatable bladder system for applying generally uniform pressure to parts being welded to insure proper contact at the welding interface includes a first sheet that is generally transparent to electromagnetic radiation to allow such radiation to pass therethrough. This electromagnetic radiation serves to heat the parts to a temperature sufficient to create a weld. The inflatable bladder also includes a second sheet that is also generally transparent to electromagnetic radiation. The second sheet is coupled to the first sheet to create a sealed volume therebetween. Fluid is selectively introduced into the sealed volume in order to expand the bladder into engagement with the parts being welded to exert a generally uniform pressure thereon.Type: GrantFiled: January 11, 2001Date of Patent: November 26, 2002Assignee: Branson Ultrasonics CorporationInventors: David Grewell, Donald C. Lovett
-
Publication number: 20020088777Abstract: An inflatable bladder system for applying generally uniform pressure to parts being welded to insure proper contact at the welding interface includes a first sheet that is generally transparent to electromagnetic radiation to allow such radiation to pass therethrough. This electromagnetic radiation serves to heat the parts to a temperature sufficient to create a weld. The inflatable bladder also includes a second sheet that is also generally transparent to electromagnetic radiation. The second sheet is coupled to the first sheet to create a sealed volume therebetween. Fluid is selectively introduced into the sealed volume in order to expand the bladder into engagement with the parts being welded to exert a generally uniform pressure thereon.Type: ApplicationFiled: January 11, 2001Publication date: July 11, 2002Inventors: David Grewell, Donald C. Lovett