Patents by Inventor Coenraad Jan Spaans

Coenraad Jan Spaans 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).

  • Hydrogels and methods for their production
    Patent number: 7297726
    Abstract: The present invention relates to new hydrogels with improved mechanical properties and methods of their preparation. The hydrogels are formed from hydrophilic polymers having function hydroxyl groups and have low elasticity modulus typically less than about 10 kPa, a tensile strength above 1 Mpa, an elongation above 50% which makes suitable as medical implants, in particular intraocular lenses. The hydrogels are prepared by a crosslinking method with a comparatively low concentration of hydrophilic polymer of a sufficiently high molecular weight dissolved in a good solvent.
    Type: Grant
    Filed: June 30, 2004
    Date of Patent: November 20, 2007
    Assignee: AMO Groningen B.V.
    Inventors: Albert Johan Pennings, Coenraad Jan Spaans, Jacqueline Hermina deGroot
  • Hydrogels and methods for their production
    Patent number: 6846875
    Abstract: The present invention relates to new hydrogels with improved mechanical properties and methods of their preparation. The hydrogels are formed from hydrophilic polymers having function hydroxyl groups and have low elasticity modulus typically less than about 10 kPa, a tensile strength above 1 MPa, an elongation above 50% which makes suitable as medical implants, in particular intraocular lenses. The hydrogels are prepared by a crosslinking method with a comparatively low concentration of hydrophilic polymer of a sufficiently high molecular weight dissolved in a good solvent.
    Type: Grant
    Filed: April 10, 2001
    Date of Patent: January 25, 2005
    Assignee: Pharmacia Groningen BV
    Inventors: Albert Johan Pennings, Coenraad Jan Spaans, Jacqueline Hermina deGroot
  • Biomedical polyurethane, its preparation and use
    Patent number: 6784273
    Abstract: The invention is directed to a novel biomedical polyurethane based on diisocyanatae linked polyester polymer and diol components, said diol component having a uniform block-length.
    Type: Grant
    Filed: June 19, 2001
    Date of Patent: August 31, 2004
    Assignee: Polyganics B.V.
    Inventors: Coenraad Jan Spaans, Jacqueline Hermina de Groot, Folkert Gerhardus Dekens, Albert Johan Pennings
  • Hydrogels and methods for their production
    Publication number: 20020034547
    Abstract: The present invention relates to new hydrogels with improved mechanical properties and methods of their preparation. The hydrogels are formed from hydrophilic polymers having function hydroxyl groups and have low elasticity modulus typically less than about 10 kPa, a tensile strength above 1 MPa, an elongation above 50% which makes suitable as medical implants, in particular intraocular lenses. The hydrogels are prepared by a crosslinking method with a comparatively low concentration of hydrophilic polymer of a sufficiently high molecular weight dissolved in a good solvent.
    Type: Application
    Filed: April 10, 2001
    Publication date: March 21, 2002
    Inventors: Albert Johan Pennings, Coenraad Jan Spaans, Jacqueline Hermina deGroot
  • Biomedical polyurethane-amide, its preparation and use
    Publication number: 20010043913
    Abstract: The invention is directed to a novel in situ produced macroporous biomedical polyurethane-amide material based on chain extended isocyanate terminated polyester prepolymer units, wherein the said chain extension has been done with at least one dicarboxylic acid or a hydroxy-carboxylic acid.
    Type: Application
    Filed: April 2, 2001
    Publication date: November 22, 2001
    Applicant: Polyganics B.V.
    Inventors: Coenraad Jan Spaans, Vincent Willem Belgraver, Onno Rienstra, Jacqueline Hermina de Groot, Albert Johan Pennings