Patents by Inventor Negus B. Adefris

Negus B. Adefris 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).

  • Publication number: 20190092990
    Abstract: Abrasive particles comprising shaped abrasive particles each having a sidewall, each of the shaped abrasive particles comprising alpha alumina and having a first face and a second face separated by a sidewall and having a maximum thickness, T; and the shaped abrasive particles further comprising a plurality of grooves on the second face.
    Type: Application
    Filed: November 21, 2018
    Publication date: March 28, 2019
    Inventors: John T. Boden, Dwight D. Erickson, Scott R. Culler, Negus B. Adefris, John D. Haas
  • Publication number: 20190091835
    Abstract: The method generally involves the steps of filling the cavities in a production tool each with an individual abrasive particle. Aligning a filled production tool and a resin coated backing for transfer of the abrasive particles to the resin coated backing. Transferring the abrasive particles from the cavities onto the resin coated backing and removing the production tool from the aligned position with the resin coated backing. Thereafter the resin layer is cured, a size coat is applied and cured and the coated abrasive article is converted to sheet, disk, or belt form by suitable converting equipment.
    Type: Application
    Filed: November 21, 2018
    Publication date: March 28, 2019
    Inventors: Scott R. Culler, John T. Boden, Steven J. Keipert, Negus B. Adefris
  • Publication number: 20190047214
    Abstract: The present disclosure provides methods of making a vitreous bond abrasive article and a metal bond abrasive article. An abrasive article preform is produced by an additive manufacturing sub-process comprising the deposition of a layer of loose powder particles in a confined region and selective heating via conduction or irradiation to heat treat an area of the layer of loose powder particles. The loose powder particles include abrasive particles and organic compound particles, as well as vitreous bond precursor particles or metal particles. The abrasive article preform produced by additive manufacturing is subsequently heated to provide the vitreous bond abrasive article comprising the abrasive particles retained in a vitreous bond material, or to provide the metal bond abrasive article. Also, the methods include receiving, by an additive manufacturing device having a processor, a digital object specifying data for an abrasive article, and generating the abrasive article with the manufacturing device.
    Type: Application
    Filed: March 30, 2017
    Publication date: February 14, 2019
    Inventors: Carsten Franke, Maiken Givot, Malte Korten, Robert L.W. Smithson, Brian D. Goers, Negus B. Adefris, Thomas J. Anderson, Brian A. Shukla, Michael C. Harper, Elizaveta Y. Plotnikov
  • Publication number: 20190022826
    Abstract: The present disclosure provides methods of making a vitreous bond abrasive article and a metal bond abrasive article. The methods include sequential steps. Step a) includes a subprocess including sequentially: i) depositing a layer of loose powder particles in a confined region; and ii) selectively applying heat via conduction or irradiation, to heat treat an area of the layer of loose powder particles. The loose powder particles include abrasive particles and organic compound particles, as well as vitreous bond precursor particles or metal particles. The layer of loose powder particles has substantially uniform thickness. Step b) includes independently carrying out step a) a number of times to generate an abrasive article preform comprising the bonded powder particles and remaining loose powder particles. Step c) includes separating remaining loose powder particles from the abrasive article preform.
    Type: Application
    Filed: January 18, 2017
    Publication date: January 24, 2019
    Inventors: Carsten Franke, Maiken Givot, Malte Korten, Robert L.W. Smithson, Brian D. Goers, Negus B. Adefris, Thomas J. Anderson, Brian A. Shukla, Michael C. Harper, Elizaveta Y. Plotnikov
  • Patent number: 10150900
    Abstract: A ceramic shaped abrasive particle bounded by a base surface having a perimeter, contiguous sidewalls abutting the perimeter, and a multifaceted surface comprising contiguous facets. Each of the contiguous sidewalls abuts the perimeter, and collectively the contiguous sidewalls abut the perimeter in its entirety. Adjacent pairs of the contiguous sidewalls abut each other along respective corner edges. The multifaceted surface is spaced apart from the base surface by the contiguous sidewalls. At least one V-shaped groove extends from one of the corner edges across the multifaceted surface to one of the contiguous sidewalls that does not contact that corner edge. Less than ten percent of the multifaceted surface area is parallel to the base surface. Pluralities of the shaped abrasive particles and coated abrasive articles including them are also disclosed.
    Type: Grant
    Filed: April 17, 2015
    Date of Patent: December 11, 2018
    Assignee: 3M Innovative Properties Company
    Inventor: Negus B. Adefris
  • Publication number: 20180223145
    Abstract: Abrasive particles comprising shaped abrasive particles each having a sidewall, each of the shaped abrasive particles comprising alpha alumina and having a first face and a second face separated by a sidewall and having a maximum thickness, T; and the shaped abrasive particles further comprising a plurality of grooves on the second face.
    Type: Application
    Filed: April 4, 2018
    Publication date: August 9, 2018
    Inventors: John T. Boden, Dwight D. Erickson, Scott R. Culler, Negus B. Adefris, John D. Haas
  • Publication number: 20180126515
    Abstract: Methods of making metal bond abrasive articles via powder bed jetting are disclosed. Metal bond abrasive articles prepared by the method include abrasive articles having arcuate or tortuous cooling channels, abrasive segments, abrasive wheels, and rotary dental tools.
    Type: Application
    Filed: June 16, 2016
    Publication date: May 10, 2018
    Inventors: Carsten Franke, Brian D. Goers, Robert L.W. Smithson, Negus B. Adefris, Brian A. Shukla, Michael C. Harper, Elizaveta Y. Plotnikov
  • Publication number: 20180104793
    Abstract: Methods of making vitreous bond abrasive articles and their precursors using powder bed jetting are disclosed. Vitreous bond abrasive articles prepared by the method include abrasive articles having arcuate or tortuous cooling channels, unitary structured abrasive discs, abrasive segments, shaped abrasive particles, and abrasive wheels.
    Type: Application
    Filed: June 23, 2016
    Publication date: April 19, 2018
    Inventors: Carsten Franke, Robert L.W. Smithson, Brian D. Goers, Negus B. Adefris, Maiken Givot, Thomas J. Anderson, Steven J. Keipert
  • Patent number: 9938439
    Abstract: Abrasive particles comprising shaped abrasive particles each having a sidewall, each of the shaped abrasive particles comprising alpha alumina and having a first face and a second face separated by a sidewall and having a maximum thickness, T; and the shaped abrasive particles further comprising a plurality of grooves on the second face.
    Type: Grant
    Filed: May 6, 2014
    Date of Patent: April 10, 2018
    Assignee: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: John T. Boden, Dwight D. Erickson, Scott R. Culler, Negus B. Adefris, John D. Haas
  • Patent number: 9890309
    Abstract: Abrasive particles comprising shaped abrasive particles each having a sidewall, each of the shaped abrasive particles comprising alpha alumina and having a first face and a second face separated by a sidewall and having a maximum thickness, T; and the shaped abrasive particles further comprising a plurality of grooves on the second face.
    Type: Grant
    Filed: May 6, 2014
    Date of Patent: February 13, 2018
    Assignee: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: John T. Boden, Dwight D. Erickson, Scott R. Culler, Negus B. Adefris, John D. Haas
  • Publication number: 20170335158
    Abstract: Shaped ceramic abrasive particles include a first surface having a perimeter having a perimeter comprising at least first and second edges. A first region of the perimeter includes the second edge and extends inwardly and terminates at two corners defining first and second acute interior angles. The perimeter has at most four corners that define acute interior angles. A second surface is disposed opposite, and not contacting, the first surface. A peripheral surface is disposed between and connects the first and second surfaces. The peripheral surface has a first predetermined shape. Methods of making the shaped ceramic abrasive particles, and abrasive articles including them are also disclosed.
    Type: Application
    Filed: August 10, 2017
    Publication date: November 23, 2017
    Inventor: Negus B. Adefris
  • Patent number: 9771504
    Abstract: Shaped ceramic abrasive particles include a first surface having a perimeter having a perimeter comprising at least first and second edges. A first region of the perimeter includes the second edge and extends inwardly and terminates at two corners defining first and second acute interior angles. The perimeter has at most four corners that define acute interior angles. A second surface is disposed opposite, and not contacting, the first surface. A peripheral surface is disposed between and connects the first and second surfaces. The peripheral surface has a first predetermined shape. Methods of making the shaped ceramic abrasive particles, and abrasive articles including them are also disclosed.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: September 26, 2017
    Assignee: 3M Innovative Properties Company
    Inventor: Negus B. Adefris
  • Publication number: 20170252898
    Abstract: Methods of making abrasive articles involve adhering shaped abrasive particles to a reinforcing member according to a predetermined pattern and optionally orientation, and depositing a space-filling binder precursor on the reinforcing member and shaped abrasive particles to provide a filled abrasive preform, disposing another reinforcing member onto the filled abrasive preform, and curing the abrasive article precursor to form the abrasive articles. In some aspects, multiple abrasive preforms are stacked on each other. Bonded abrasive wheels preparable according to the methods are also disclosed.
    Type: Application
    Filed: September 14, 2015
    Publication date: September 7, 2017
    Inventors: Melissa C. Schillo-Armstrong, Scott R. Culler, Brian D. Goers, Roger J. Eicheldinger, Negus B. Adefris
  • Patent number: 9573250
    Abstract: Ceramic shaped abrasive particles have four major sides joined by six common edges. Each one of the four major sides contacts three other of the four major sides. The six common edges have substantially the same length. Methods of making the ceramic shaped particle are disclosed. The ceramic shaped abrasive particles are useful for abrading a surface of a workpiece. An abrasive article includes the ceramic shaped abrasive particles retained in a binder.
    Type: Grant
    Filed: April 20, 2011
    Date of Patent: February 21, 2017
    Assignee: 3M Innovative Properties Company
    Inventors: Mark G. Schwabel, Maiken Givot, Negus B. Adefris
  • Publication number: 20170037288
    Abstract: A ceramic shaped abrasive particle bounded by a base surface having a perimeter, contiguous sidewalls abutting the perimeter, and a multifaceted surface comprising contiguous facets. Each of the contiguous sidewalls abuts the perimeter, and collectively the contiguous sidewalls abut the perimeter in its entirety. Adjacent pairs of the contiguous sidewalls abut each other along respective corner edges. The multifaceted surface is spaced apart from the base surface by the contiguous sidewalls. At least one V-shaped groove extends from one of the corner edges across the multifaceted surface to one of the contiguous sidewalls that does not contact that corner edge. Less than ten percent of the multifaceted surface area is parallel to the base surface. Pluralities of the shaped abrasive particles and coated abrasive articles including them are also disclosed.
    Type: Application
    Filed: April 17, 2015
    Publication date: February 9, 2017
    Inventor: Negus B. Adefris
  • Publication number: 20160311081
    Abstract: A coated abrasive article maker apparatus including a first web path guiding a production tool such that it wraps a portion of the outer circumference of an abrasive particle transfer roll; a second web path for a resin coated backing guiding the resin coated backing such that it wraps a portion of the outer circumference of the abrasive particle transfer roll with the resin layer positioned facing the dispensing surface of the production tool this is positioned between the resin coated backing and the outer circumference of the abrasive particle transfer roll; and wherein abrasive particles are transferred from cavities in the production tool to the resin coated backing as the resin coated backing and the production tool traverse around the abrasive particle transfer roll
    Type: Application
    Filed: December 22, 2014
    Publication date: October 27, 2016
    Inventors: Scott R. Culler, John T. Boden, Steven J. Keipert, Negus B. Adefris, Karan Jindal, Aaron K. Nienaber, David L. Morrison, Peter T. Benson, Pratik Pranay, Bradford B. Wright
  • Publication number: 20160311084
    Abstract: The method generally involves the steps of filling the cavities in a production tool each with an individual abrasive particle. Aligning a filled production tool and a resin coated backing for transfer of the abrasive particles to the resin coated backing. Transferring the abrasive particles from the cavities onto the resin coated backing and removing the production tool from the aligned position with the resin coated backing. Thereafter the resin layer is cured, a size coat is applied and cured and the coated abrasive article is converted to sheet, disk, or belt form by suitable converting equipment.
    Type: Application
    Filed: December 11, 2014
    Publication date: October 27, 2016
    Inventors: Scott R. Culler, John T. Boden, Steven J. Keipert, Negus B. Adefris
  • Publication number: 20160279762
    Abstract: Structured abrasive articles include a backing and shaped abrasive composites secured to the backing. The shaped abrasive composites include abrasive grits dispersed in a binder matrix. The shaped abrasive composites include a bottom surface and a top surface opposite and not contacting the bottom surface, and at least three sidewalls abutting both the bottom and top surfaces and two other sidewalls. In one embodiment, at least two cusps are formed by the top surface and individual sidewalls. In another embodiment, the top surface includes at least two triangular facets that contact at least two respective sidewalls and at least two cusps. The top surface includes at least one interior recessed portion nearer the cusps than the bottom surface. Methods of abrading a workpiece using the structured abrasive article are also disclosed.
    Type: Application
    Filed: November 4, 2014
    Publication date: September 29, 2016
    Inventors: John D. Haas, Negus B. Adefris, Scott R. Culler
  • Patent number: 9446502
    Abstract: Precursor alpha alumina abrasive particles in a mold are subjected to a drying process that cracks or fractures at least a majority of the precursor abrasive particles into at least two pieces thereby producing abrasive shards having a smaller size than the mold cavity from which they were made. The smaller abrasive shards, once formed, could be reassembled like jigsaw puzzle pieces to reproduce the original cavity shape of the mold from which they were made. The cracking or fracturing of the precursor abrasive particles is believed to occur by ensuring that the surface tension of the abrasive dispersion to the walls of the mold is greater than the internal attractive forces of the abrasive dispersion as the abrasive dispersion is dried within the mold cavity.
    Type: Grant
    Filed: September 8, 2011
    Date of Patent: September 20, 2016
    Assignee: 3M Innovative Properties Company
    Inventors: Dwight D. Erickson, Scott R. Culler, Negus B. Adefris, John T. Boden, John D. Haas
  • Patent number: 9447311
    Abstract: Shaped abrasive particles comprising alpha alumina and having a first side, a second side, a maximum length along a longitudinal axis and a maximum width transverse to the longitudinal axis. The first side comprising a quadrilateral having four edges and four vertices with the quadrilateral selected from the group consisting of a rhombus, a rhomboid, a kite, or a superellipse. The shaped abrasive particles having an aspect ratio of the maximum length divided by the maximum width of 1.3 or greater.
    Type: Grant
    Filed: November 23, 2010
    Date of Patent: September 20, 2016
    Assignee: 3m Innovative Properties Company
    Inventors: Negus B. Adefris, Ehrich J. Braunschweig, Steven J. Keipert