Patents by Inventor Jan W. H. Schreurs

Jan W. H. Schreurs 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 making porous magnetic glass and crystal-containing structures
    Patent number: 4395271
    Abstract: The present invention provides a method for making porous bodies of magnetic glass and/or crystal-containing materials having magnetic crystals incorporated therein with dimensions less than about 1000A. Preferably, the crystals have dimensions less than 500A such that the porous bodies demonstrate essential superparamagnetic behavior. The method involves preparing a body which, upon heat treatment, will separate into at least two vitreous phases and at least one crystal phase. One of the vitreous phases is etched away leaving a structure remaining which contains said magnetic crystals. When present as fine particles, the porous magnetic bodies are especially suitable for use in biological assays.
    Type: Grant
    Filed: May 9, 1980
    Date of Patent: July 26, 1983
    Assignee: Corning Glass Works
    Inventors: George H. Beall, Gerald R. Mansfield, Jan W. H. Schreurs
  • Glass-encapsulated magnetic materials and methods for making them
    Patent number: 4360441
    Abstract: Magnetic materials exhibiting ferrimagnetic and/or superparamagnetic behavior, produced by impregnating porous glasses with iron and, optionally, manganese, cobalt and nickel compounds, reacting the compounds with the porous glass to form bound complexes, heating the glass to expel unreacted organometallics, and further heating to convert the bound complexes to ferrimagnetic and/or superparamagnetic oxide crystallites, are described. Ferrimagnetic iron oxide crystallites exhibiting coercivities above 10,000 Oe can be made.
    Type: Grant
    Filed: June 25, 1981
    Date of Patent: November 23, 1982
    Assignee: Corning Glass Works
    Inventors: Nicholas F. Borrelli, David L. Morse, Jan W. H. Schreurs
  • Porous magnetic glass structure
    Patent number: 4233169
    Abstract: The present invention provides a method for making porous bodies of magnetic glass and/or crystal-containing materials having magnetic crystals incorporated therein with dimensions less than about 1000A. Preferably, the crystals have dimensions less than 500A such that the porous bodies demonstrate essential superparamagnetic behavior. The method involves preparing a body which, upon heat treatment, will separate into at least two vitreous phases and at least one crystal phase. One of the vitreous phases is etched away leaving a structure remaining which contains said magnetic crystals. When present as fine particles, the porous magnetic bodies are especially suitable for use in biological assays.
    Type: Grant
    Filed: April 13, 1979
    Date of Patent: November 11, 1980
    Assignee: Corning Glass Works
    Inventors: George H. Beall, Gerald R. Mansfield, Jan W. H. Schreurs