Patents by Inventor Duurt Pieter Willem Alkema

Duurt Pieter Willem Alkema 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).

  • Disinfecting wound dressing and process for preparing such
    Patent number: 9883974
    Abstract: A process for preparing a disinfecting wound dressing for the protection of wounds, such as burn wounds, ulcers and cuts, the process comprising the steps of providing a yarn-based substrate, subjecting a surface of the substrate to a plasma environment, thereby providing non-leaching and biocidal features to the substrate surface by exposing the substrate surface to an antimicrobial active compound reaction.
    Type: Grant
    Filed: December 28, 2010
    Date of Patent: February 6, 2018
    Assignee: NEDERLANDSE ORGANISATIE VOOR TOEGEPAST-NATUURWETENSCHAPPELIJK ONDERZOEK TNO
    Inventors: Marcel Simor, André Schilt, Duurt Pieter Willem Alkema, Timo Huijser
  • RADIATION CURABLE COATING COMPOSITION FOR OPTICAL FIBER WITH REDUCED ATTENUATION LOSS
    Publication number: 20140163132
    Abstract: The present invention relates to a radiation curable coating composition comprising a radiation curable oligomer comprising a backbone derived from polypropylene glycol and a dimer acid based polyester polyol, wherein said coating composition, when cured, is having: a) a hardening temperature (Th) of from ?10° C. to about ?20° C. and a modulus measured at said Th of lower than 5.0 MPa; or b) a hardening temperature (Th) of from ?20° C. to about ?30° C. and a modulus measured at said Th of lower than 20.0 MPa; or c) a hardening temperature (Th) of lower than about ?30° C. and a modulus measured at said Th of lower than 70.0 MPa.
    Type: Application
    Filed: October 1, 2013
    Publication date: June 12, 2014
    Applicant: DSM IP ASSETS B.V
    Inventors: Sandra Joanna NAGELVOORT, Johannes Adrianus VAN EEKELEN, Adrianus Gijsbertus Maria ABEL, Gouke Dirk-Jan GEUS, Duurt Pieter Willem ALKEMA, Giacomo Stefano ROBA, Marco ARIMONDI, Lidia TERRUZZI, Sabrina FOGLIANI
  • DISINFECTING WOUND DRESSING AND PROCESS FOR PREPARING SUCH
    Publication number: 20130046260
    Abstract: The invention relates to a process for preparing a disinfecting wound dressing for the protection of wounds, such as burn wounds, ulcers and cuts. The process comprises the steps of providing a yarn-based substrate, subjecting a surface of the substrate to a plasma environment, thereby providing non-leaching and biocidal features to the substrate surface by exposing the substrate surface to an antimicrobial active compound reaction.
    Type: Application
    Filed: December 28, 2010
    Publication date: February 21, 2013
    Applicant: Nederlandse Organisatie voor toegepast-natuurweten schappelijk onderzoek TNO
    Inventors: Marcel Simor, André Schilt, Duurt Pieter Willem Alkema, Timo Huijser
  • Radiation curable coating composition for optical fiber with reduced attenuation loss
    Publication number: 20090080851
    Abstract: The present invention relates to a radiation curable coating composition comprising a radiation curable oligomer comprising a backbone derived from polypropylene glycol and a dimer acid based polyester polyol, wherein said coating composition, when cured, is having: a) a hardening temperature (Th) of from ?10° C. to about ?20° C. and a modulus measured at said Th of lower than 5.0 MPa; or b) a hardening temperature (Th) of from ?20° C. to about ?30° C. and a modulus measured at said Th of lower than 20.0 MPa; or c) a hardening temperature (Th) of lower than about ?30° C. and a modulus measured at said Th of lower than 70.0 MPa.
    Type: Application
    Filed: November 12, 2008
    Publication date: March 26, 2009
    Applicant: DSM IP ASSETS B.V.,
    Inventors: Sandra Joanna Nagelvoort, Johannes Adrianus Van Eekelen, Adrianus Gijsbertus Maria Abel, Gouke Dirk-Jan Geus, Duurt Pieter Willem Alkema, Giacomo Stefano Roba, Marco Arimondi, Lidia Terruzzi, Sabrina Fogliani
  • Optical fiber with reduced attenuation loss
    Patent number: 7317858
    Abstract: An optical fiber having an internal glass portion, a first coating layer surrounding the glass portion and a second coating layer surrounding the first coating layer. The first coating layer is formed from a cured polymeric material obtained by curing a radiation curable composition having a radiation curable oligomer having a backbone derived from polypropylene glycol and a dimer acid based polyester polyol. The cured polymeric material has: (a) a hardening temperature (Th) from ?10° C. to about ?20° C. and a modulus measured at the Th lower than 5.0 MPa; or (b) a hardening temperature (Th) from ?20° C. to about ?30° C. and a modulus measured at the Th lower than 20.0 MPa; or (c) a hardening temperature (Th) lower than about ?30° C. and a modulus measured at the Th lower than 70.0 MPa.
    Type: Grant
    Filed: April 24, 2002
    Date of Patent: January 8, 2008
    Assignee: Prysmian Cavi E Sistemi Energia S.R.L.
    Inventors: Giacomo Stefano Roba, Lidia Terruzzi, Sabrina Fogliani, Marco Armondi, Sandra Joanna Nagelvoort, Johannes Adrianus Van Eekelen, Adrianus Gijsbertus Maria Abel, Gouke Dirk Jan Geus, Duurt Pieter Willem Alkema