Patents Assigned to Flamemag International Gie
  • 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