Patents by Inventor Stefan Hendrikus Schaafsma

Stefan Hendrikus Schaafsma 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: 9120709
    Abstract: The invention pertains to a method of making urea-containing particles wherein with a lower degree of cooling, high mechanical strengths are obtained. The method comprises the steps of (a) providing a first polymer 10 layer; (b) feeding urea droplets onto said first polymer layer, (c) cooling the droplets provided on the first polymer layer to a temperature between 55° C. and 120° C.; (d) applying a second polymer layer onto the first polymer layer comprising the droplets so as to form encapsulated urea droplets; and (e) separating the encapsulated urea droplets.
    Type: Grant
    Filed: October 24, 2012
    Date of Patent: September 1, 2015
    Assignee: Stamicarbon B.V.
    Inventor: Stefan Hendrikus Schaafsma
  • Patent number: 8845775
    Abstract: This invention relates to a coating composition for a fertilizer comprising at least 50 wt % of a cross-linked lipid; and less than 0.20 wt %, relative to the total weight of the lipid, of a catalyst for cross-linking an unsaturated lipid. The cross-linked lipid has a viscosity at 20 degree Celsius (° C.) in the range of 110 and 800 mPa·s.
    Type: Grant
    Filed: September 28, 2010
    Date of Patent: September 30, 2014
    Assignee: Stamicarbon B.V.
    Inventor: Stefan Hendrikus Schaafsma
  • Publication number: 20140260469
    Abstract: The invention pertains to a method of making urea-containing particles wherein with a lower degree of cooling, high mechanical strengths are obtained. The method comprises the steps of (a) providing a first polymer 10 layer; (b) feeding urea droplets onto said first polymer layer, (c) cooling the droplets provided on the first polymer layer to a temperature between 55° C. and 120° C.; (d) applying a second polymer layer onto the first polymer layer comprising the droplets so as to form encapsulated urea droplets; and (e) separating the encapsulated urea droplets.
    Type: Application
    Filed: October 24, 2012
    Publication date: September 18, 2014
    Applicant: STAMICARBON B.V.
    Inventor: Stefan Hendrikus Schaafsma
  • Patent number: 8506671
    Abstract: Coated fertilizer wherein the fertilizer and animal feed comprises particles coated with a biomass composition comprising 5-35 wt. % solid biomass particles with a D50 between 0 and 250 ?m and a D90 of less than 400 ?m and 95-65 wt. % oil, a biomass composition wherein the biomass composition comprises solid biomass particles with a D50 between 0 and 250 ?m and a D30 of less than 400 ?m and a process for the production of a biomass composition wherein a biomass composition comprising solid particles having a D50 between 100 and 1000 ?m is filtrated and the residue is grinded until the solid particles have a D50 between 0 and 250 ?m and a D90 of less than 400 ?m.
    Type: Grant
    Filed: December 12, 2008
    Date of Patent: August 13, 2013
    Assignee: DSM IP Assets B.V.
    Inventors: Stefan Hendrikus Schaafsma, Richard Johannes Matheus Janssen
  • Publication number: 20130055776
    Abstract: This invention relates to a coating composition for a fertilizer comprising at least 50 wt % of a cross-linked lipid; and less than 0.20 wt %, relative to the total weight of the lipid, of a catalyst for cross-linking an unsaturated lipid. The cross-linked lipid has a viscosity at 20 degree Celsius (° C.) in the range of 110 and 800 mPa·s.
    Type: Application
    Filed: September 28, 2010
    Publication date: March 7, 2013
    Applicant: Stamicarbon B.V.
    Inventor: Stefan Hendrikus Schaafsma
  • Patent number: 8236086
    Abstract: Coated fertilizer wherein the fertilizer comprises fertilizer particles coated with a biomass composition comprising 1-60 wt. % solid biomass particles with a D50 between 0 and 150 ?m and 99-40 wt. % oil, a biomass composition wherein the biomass composition comprises solid biomass particles with a D50 between 0 and 150 ?m and a process for the production of a biomass composition wherein a biomass composition comprising solid particles having a D50 between 30 and 500 ?m is filtrated and the residue is grinded until the solid particles have a D50 between 0 and 150 ?m.
    Type: Grant
    Filed: June 29, 2007
    Date of Patent: August 7, 2012
    Assignee: Stamicarbon B.V.
    Inventors: Richard Johannes Matheus Janssen, Stefan Hendrikus Schaafsma, Theodorus Marie Leopold Evers
  • Publication number: 20110000268
    Abstract: Coated fertilizer wherein the fertilizer and animal feed comprises particles coated with a biomass composition comprising 5-35 wt. % solid biomass particles with a D50 between 0 and 250 ?m and a D90 of less than 400 ?m and 95-65 wt. % oil, a biomass composition wherein the biomass composition comprises solid biomass particles with a D50 between 0 and 250 ?m and a D30 of less than 400 ?m and a process for the production of a biomass composition wherein a biomass composition comprising solid particles having a D50 between 100 and 1000 ?m is filtrated and the residue is grinded until the solid particles have a D50 between =0 and 250 ?m and a D90 of less than 400 ?m.
    Type: Application
    Filed: December 12, 2008
    Publication date: January 6, 2011
    Inventors: Stefan Hendrikus Schaafsma, Richard Johannes Matheus Janssen
  • Patent number: 7547738
    Abstract: The invention relates to agglomerates of flame-retardants, in particular melamine cyanurate, containing aggregates with an average size of between 0.1 and 50? bonded to each other with the aid of an auxiliary material. This auxiliary material is present in a concentration of between 0.1 and 10 wt. %, relative to the total agglomerates weight, and has a softening point higher than 40° C. The invention further relates to a method for producing said agglomerates, the use of the agglomerates in the preparation of polymer compositions, and polymer compositions containing melamine cyanurate.
    Type: Grant
    Filed: May 23, 2006
    Date of Patent: June 16, 2009
    Assignee: Ciba Specialty Chemicals Corporation
    Inventors: Renier Henricus Maria Kierkels, Philippe Wolfgang Paul Valere Bleiman, Stefan Hendrikus Schaafsma, Johannes Cornelis Jozef Mokveld
  • Publication number: 20060276572
    Abstract: The invention relates to agglomerates of flame-retardants, in particular melamine cyanurate, containing aggregates with an average size of between 0.1 and 50? bonded to each other with the aid of an auxiliary material. This auxiliary material is present in a concentration of between 0.1 and 10 wt. %, relative to the total agglomerates weight, and has a softening point higher than 40° C. The invention further relates to a method for producing said agglomerates, the use of the agglomerates in the preparation of polymer compositions, and polymer compositions containing melamine cyanurate.
    Type: Application
    Filed: May 23, 2006
    Publication date: December 7, 2006
    Inventors: Renier Henricus Kierkels, Philippe Wolfgang Paul Valere Bleiman, Stefan Hendrikus Schaafsma, Johannes Jozef Mokveld