Patents by Inventor Maarten Cornelis DE GRAAF

Maarten Cornelis DE GRAAF 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: 11976690
    Abstract: A bearing device with first and second bearing surfaces facing each other and which are moveable relative to one another. The first and second bearing surfaces are separated by a bearing gap filled with a lubricant. The lubricant comprises a carrier fluid and particles which respond to magnetic or electric fields. The particles are suspended in the carrier fluid in the absence of magnetic or electric fields. One or more magnetic or electric field generators are embedded in the first or second bearing surface to generate a localized magnetic or electric field which locally removes the particles from suspension by exerting a field force on the particles. This forms a local flow obstruction on at least one of the bearing surfaces in the form of an agglomerate of previously suspended particles. The local flow obstruction locally obstructs a flow of the lubricant.
    Type: Grant
    Filed: September 29, 2020
    Date of Patent: May 7, 2024
    Assignee: Bifröst Research and Development B.V.
    Inventors: Stefan George Emile Lampaert, Ronald Adrianus Johannes Van Ostayen, Maarten Cornelis De Graaf
  • Publication number: 20220373031
    Abstract: Bearing device comprising: —a first bearing surface and a second bearing surface which are moveable relative to one another and which face one another, wherein the first bearing surface and second bearing surface are separated by a bearing gap filled with a lubricant, wherein the lubricant comprises a carrier fluid and particles which respond to magnetic or electric fields, wherein said particles are suspended in the carrier fluid in the absence of magnetic or electric fields, —one or more field generators which are embedded in the first or second bearing surface, wherein the field generators are magnetic or electric field generators configured to generate a localized magnetic or electric field which is configured to locally remove the particles from suspension by exerting a field force on the particles, thereby forming a local flow obstruction on at least one of the bearing surfaces in the form of an agglomerate of previously suspended particles, wherein the local flow obstruction is configured to locally ob
    Type: Application
    Filed: September 29, 2020
    Publication date: November 24, 2022
    Applicants: Bifröst Research and Development B.V., Bifröst Research and Development B.V.
    Inventors: Stefan George Emile LAMPAERT, Ronald Adrianus Johannes VAN OSTAYEN, Maarten Cornelis DE GRAAF
  • Patent number: 10253438
    Abstract: A net includes at least two ropes (2, 4), at least one mesh, wherein at least one corner of a mesh is formed by a knot (15) formed by two of the ropes (2, 4). The knot includes a first and a second opening (6, 8) in the first rope (2) through which the second rope (4) passes, and a first opening (10) in the second rope (4) through which the first rope (2) passes. A part of the first rope (2) is being positioned in the first opening (10) in the second rope (4) being in between the first and second opening (6, 8) of the first rope (2).
    Type: Grant
    Filed: August 15, 2014
    Date of Patent: April 9, 2019
    Assignee: Maritiem Consultants B.V.
    Inventors: Erik Martin De Graaf, Maarten Cornelis De Graaf
  • Publication number: 20160201238
    Abstract: A net includes at least two ropes (2, 4), at least one mesh, wherein at least one corner of a mesh is formed by a knot (15) formed by two of the ropes (2, 4). The knot includes a first and a second opening (6, 8) in the first rope (2) through which the second rope (4) passes, and a first opening (10) in the second rope (4) through which the first rope (2) passes. A part of the first rope (2) is being positioned in the first opening (10) in the second rope (4) being in between the first and second opening (6, 8) of the first rope (2).
    Type: Application
    Filed: August 15, 2014
    Publication date: July 14, 2016
    Inventors: Erik Martin DE GRAAF, Maarten Cornelis DE GRAAF