Colloidal silicon carbide and the method of making the same

Claim 2

SILICON CARBIDE PARTICLES CHARACTERIZED BY HAVING AN AVERAGE PARTICLE DIAMETER SIZE IN THE RANGE OF BETWEEN 100 TO ABOUT 1000 MILLIMICRONS AND BY HAVING MINOR IMPURITIES SELECTED FROM THE GROUP CONSISTING OF ELEMENTS OF THE THIRD AND FIFTH COLUMN OF THE PERIODIC TABLE, SAID IMPURITY ELEMENTS OF ONE OF SAID COLUMNS COMPENSATED BY ELEMENTS OF SAID OTHER COLUMN, SAID PARTICLES FURTHER CHARACTERIZED BY REFLECTING UPWARD OF 80% OF LIGHT AS COMPARED WITH MAGNESIUM OXIDE WITH NO MORE THAN A 20% VARIATION OVER THE ENTIRE VISIBLE SPECTRUM.

Claim 3

A PROCESS FOR MAKING SILICON ECARBIDE PARTICLES OF SUBSTANTIALLY CONTROLLED PARTICLE SIZE HAVING AN AVERAGE PARTICLE DIAMETER SIZE IN THE RANGE OF ABOUT 100 TO 1000 MILLIMICRONS WHICH COMPRISES REACTING A SOURCE OF SILICON SELECTED FROM THE GROUP CONSISTING OF QUARTZ, SAND, SILICIC ACID, SILIC GEL, COLLOIDAL SILICA, AMORPHOUS SILICA AND ELEMENTAL SILICON WITH AN EXCESS FO CARBON AT A TEMPERATURE IN THE RANGE OF ABOUT 1350 TO ABOUT 1750 DEGREES CENTIGRADE IN AN ATMOSPHERE SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, CARBON MONOXIDE, ARGON AND HELIUM WHICH SILICON SOURCE, CARBON AND ATMOSPHERE CONTAINING MINOR IMPURITIES SELECTED FROM THE GROUP CONSISTING OF ELEMENTS OF THE THIRD AND FIFTH COLUMN OF THE PERIODIC TABLE, SAID ELEMENTS OF ONE OF SAID COLUMNS BEING COMPENSATED BY ADDITION OF ELEMENTS OF SAID OTHER COLUMN THREBY PRODUCING PARTICLES CHARACTERIZED BY REFLECTING UPWARD OF 80% OF LIGHT AS COMPARED WITH MAGNESIUM OXIDE WITH NO MORE THAN A 20% VARIATION OVER THE ENTIRE VISIBLE SPECTRUM.

Claim 4

A PROCESS FOR MAKING SILICON ECARBIDE PARTICLES OF SUBSTANTIALLY CONTROLLED PARTICLE SIZE HAVING AN AVERAGE PARTICLE DIAMETER SIZE IN THE RANGE OF ABOUT 100 TO 1000 MILLIMICRONS WHICH COMPRISES REACTING A SOURCE OF SILICON SELECTED FROM THE GROUP CONSISTING OF QUARTZ, SAND, SILICIC ACID, SILIC GEL, COLLOIDAL SILICA, AMORPHOUS SILICA AND ELEMENTAL SILICON WITH AN EXCESS FO CARBON AT A TEMPERATURE IN THE RANGE OF ABOUT 1350 TO ABOUT 1750 DEGREES CENTIGRADE IN AN ATMOSPHERE SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, CARBON MONOXIDE, ARGON AND HELIUM WHICH SILICON SOURCE, CARBON AND ATMOSPHERE CONTAINING MINOR IMPURITIES SELECTED FROM THE GROUP CONSISTING OF ELEMENTS OF THE THIRD AND FIFTH COLUMN OF THE PERIODIC TABLE, SAID ELEMENTS OF ONE OF SAID COLUMNS BEING COMPENSATED BY ADDITION OF ELEMENTS OF SAID OTHER COLUMN THREBY PRODUCING PARTICLES CHARACTERIZED BY REFLECTING UPWARD OF 80% OF LIGHT AS COMPARED WITH MAGNESIUM OXIDE WITH NO MORE THAN A 20% VARIATION OVER THE ENTIRE VISIBLE SPECTRUM.