Patents by Inventor Dagwin Elsner

Dagwin Elsner 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).

  • Magnesium process
    Patent number: 5872169
    Abstract: The present invention relates to a flame retardant quality magnesium hydroxide having a BET surface area of less than approximately 10 m.sup.2 per gram (uncoated), an average particle size of approximately 0.5 to 10.0 micron, and less than approximately 0.5% of particles over 10 micron (average particle size measured by laserlight scattering method), and a substantial number of crystals which are generally ovoid in cross section. A process for producing a flame retardant quality magnesium hydroxide is also described.
    Type: Grant
    Filed: May 7, 1997
    Date of Patent: February 16, 1999
    Assignee: Flamemag International GIE
    Inventors: Dagwin Elsner, Roger Rothon
  • Magnesium process
    Patent number: 5843389
    Abstract: The present invention provides a process for preparing a flame retardant quality magnesium hydroxide which includes providing a magnesium salt solution; and a source of ammonia; adding a stochiometric excess of ammonia to the solution to form a magnesium hydroxide precipatate; and subjecting the magnesium hydroxide to a hydrothermal recrystallization.
    Type: Grant
    Filed: July 16, 1996
    Date of Patent: December 1, 1998
    Assignee: Flamemag International Gie
    Inventors: Dagwin Elsner, Roger Norman Rothon