Patents by Inventor Steven J. Heilig

Steven J. Heilig 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 measuring stress levels in polymeric compositions
    Patent number: 6767745
    Abstract: A method of measuring inductance or inductive reactance of a sample is provided. The method comprises the steps of: (a) providing an instrument for measuring the inductance or the inductive reactance of the sample; (b) subjecting a portion of the instrument to different temperatures and recording data corresponding to the performance of the instrument portion at each temperature; (c) measuring the inductance or the inductive reactance of the sample using the instrument; and (d) correcting the measurement of inductance or inductive reactance for temperature based on the performance data.
    Type: Grant
    Filed: July 21, 1999
    Date of Patent: July 27, 2004
    Assignee: 3M Innovative Properties Company
    Inventors: Craig S. Chamberlain, Dean E. Feyma, Steven J. Heilig, Elaine M. Yorkgitis
  • METHOD FOR MEASURING STRESS LEVELS IN POLYMERIC COMPOSITIONS
    Publication number: 20030129763
    Abstract: A method for measuring the level of stress in a polymeric or pre-polymeric composition within a given volume that includes combining the polymeric or pre-polymeric composition with a plurality of microparticles having a non-ferromagnetic or non-ferrimagnetic core provided with a coating that is ferromagnetic or ferrimagnetic to form an admixture in which the microparticles are substantially uniformly dispersed throughout the composition. The microparticles have a detectable magnetic characteristic which correlates with level of stress in the composition within a given volume. The change in the magnetic characteristic of the microparticles is then measured to determine the level of stress in the composition within a given volume.
    Type: Application
    Filed: July 21, 1999
    Publication date: July 10, 2003
    Inventors: CRAIG S. CHAMBERLAIN, DEAN E. FEYMA, STEVEN J. HEILIG, ELAINE M. YORKGITIS
  • Method for measuring stress levels in polymeric compositions
    Patent number: 6004817
    Abstract: A method for measuring the level of stress in a polymeric or pre-polymeric composition within a given volume that includes combining the polymeric or pre-polymeric composition with a plurality of microparticles having a non-ferromagnetic or non-ferrimagnetic core provided with a coating that is ferromagnetic or ferrimagnetic to form an admixture in which the microparticles are substantially uniformly dispersed throughout the composition. The microparticles have a detectable magnetic characteristic which correlates with level of stress in the composition within a given volume. The change in the magnetic characteristic of the microparticles is then measured to determine the level of stress in the composition within a given volume.
    Type: Grant
    Filed: April 4, 1997
    Date of Patent: December 21, 1999
    Assignee: 3M Innovative Properties Company
    Inventors: Craig S. Chamberlain, Dean E. Feyma, Steven J. Heilig, Elaine M. Yorkgitis