Patents by Inventor Petrus H. M. Stokman

Petrus H. M. Stokman 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: 6605329
    Abstract: The invention relates to a thermoplastic moulded part comprising at least a polyolefin or a polycondensation polymer and reinforcing fibers, characterized in that 1 to 60 wt. % of the moulded part consists of reinforcing fibers with a length of between 0.8 and 15 mm, at least a portion of which is present partly in the center and partly in the non-porous dish surface, and that the moulded part has a porosity of between 5 and 95 vol. %. The invention also relates to a process for producing such a moulded part.
    Type: Grant
    Filed: October 15, 2001
    Date of Patent: August 12, 2003
    Assignee: DSM N.V.
    Inventors: Markus J. H. Bulters, Petrus H. M. Stokman, Johannes H. Geesink
  • Publication number: 20020025424
    Abstract: The invention relates to a thermoplastic molded part comprising at least a polyolefin or a polycondensation polymer and reinforcing fibers, characterized in that 1 to 60 wt. % of the molded part consists of reinforcing fibers with a length of between 0.8 and 15 mm, at least a portion of which is present partly in the center and partly in the non-porous dish surface, and that the molded part has a porosity of between 5 and 95 vol. %.
    Type: Application
    Filed: October 15, 2001
    Publication date: February 28, 2002
    Applicant: DSm N.V.
    Inventors: Markus J.H. Bulters, Petrus H.M. Stokman, Johannes H. Geesink
  • Patent number: 6303070
    Abstract: The invention relates to a thermoplastic molded part comprising at least a polyolefin or a polycondensation polymer and reinforcing fibers, characterized in that 1 to 60 wt. % of the molded part consists of reinforcing fibers with a length of between 0.8 and 15 mm, at least a portion of which is present partly in the center and partly in the non-porous dish surface, and that the molded part has a porosity of between 5 and 95 vol. %. The invention also relates to a process for producing such a molded part.
    Type: Grant
    Filed: April 8, 1999
    Date of Patent: October 16, 2001
    Assignee: DSM N.V.
    Inventors: Markus J. H. Bulters, Petrus H. M. Stokman, Johannes H. Geesink
  • Patent number: 6127501
    Abstract: Porous polyolefin membrane with a porosity of at least 20%, which is steam sterilizable at elevated temperature, wherein the polyolefin is polyethylene with an intrinsic viscosity of at least 5 dl/g and the membrane shows a shrinkage of at most 4% in every direction in the plane of the membrane when exposed to steam with a temperature of 134.degree. C. for 10 minutes.
    Type: Grant
    Filed: November 12, 1992
    Date of Patent: October 3, 2000
    Assignee: DSM N.V.
    Inventors: Henricus M. Fortuin, Petrus H. M. Stokman
  • Patent number: 5843358
    Abstract: Process for producing a steam-sterilizable porous polyolefin membrane with a porosity of at least 20% and a shrinkage of 4% at most in every direction in the plane of the membrane in steam sterilization by subjecting a porous stretched film to a shrink treatment at a temperature equalling at least the sterilization temperature, but below the melting point of the polyolefin, in which treatment the permitted shrinkage is at least 95% of the critical shrink factor of the film in every direction in the plane of the film and a membrane of polyethylene with an intrinsic viscosity of at least 5 dl/g, steam-sterilizable at 134.degree. C.
    Type: Grant
    Filed: June 5, 1996
    Date of Patent: December 1, 1998
    Assignee: DSM N.V.
    Inventors: Henricus M. Fortuin, Petrus H.M. Stokman
  • Patent number: 5601769
    Abstract: A composite membrane including a microporous polymer film having a high air permeability as a support and a non-porous gas or vapor separating coating having a thickness of not more than 15 .mu.m is provided. The separation factor and flux of the membrane are substantially equal to those of the coating. Also provided is a process for the manufacture of a composite membrane including a support and a gas or vapor separating coating by drawing a polymeric film to which the coating material has been applied, and increasing the viscosity of the coating during drawing.
    Type: Grant
    Filed: June 2, 1995
    Date of Patent: February 11, 1997
    Assignee: DSM N.V.
    Inventors: Henricus M. Fortuin, Petrus H. M. Stokman