Patents by Inventor Ronald Eduard Hoogerwerf

Ronald Eduard Hoogerwerf 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).

  • Method for producing a filament yarn from an aromatic polyamide
    Patent number: 8871124
    Abstract: A method for producing a filament yarn from a para-aromatic polyamide, having an optically anisotropic aramid spinning solution filtered within a spinneret arrangement by using a filter having passage openings and extruded within the spinneret arrangement through a plurality of spinning orifices. The extruded anisotropic aramid spinning solution is guided via an air gap, stretched in the process, and collected in an aqueous coagulation bath. The optically anisotropic aramid spinning solution in the spinneret arrangement is fed to the spinning orifices via a flow resistor. The flow resistor is arranged closer to the spinning orifices than the filter, and the flow resistor and the filter are arranged at a distance to one another. The method may also include a para-aromatic polyamide filament yarn.
    Type: Grant
    Filed: February 12, 2010
    Date of Patent: October 28, 2014
    Assignee: Teijin Aramid B.V.
    Inventors: Leonardus A. G. Busscher, Jacobus Johannes Meerman, Ronald Eduard Hoogerwerf, Alexander L. L. Broekhof
  • METHOD FOR PRODUCING A FILAMENT YARN FROM AN AROMATIC POLYAMIDE
    Publication number: 20110300379
    Abstract: A method for producing a filament yarn from a para-aromatic polyamide, having an optically anisotropic aramid spinning solution filtered within a spinneret arrangement by using a filter having passage openings and extruded within the spinneret arrangement through a plurality of spinning orifices. The extruded anisotropic aramid spinning solution is guided via an air gap, stretched in the process, and collected in an aqueous coagulation bath. The optically anisotropic aramid spinning solution in the spinneret arrangement is fed to the spinning orifices via a flow resistor. The flow resistor is arranged closer to the spinning orifices than the filter, and the flow resistor and the filter are arranged at a distance to one another. The method may also include a para-aromatic polyamide filament yarn.
    Type: Application
    Filed: February 12, 2010
    Publication date: December 8, 2011
    Applicant: TEIJIN ARAMID B.V.
    Inventors: Leonardus A. G. Busscher, Jacobus Johannes Meerman, Ronald Eduard Hoogerwerf, Alexander L. L. Broekhof