Microwave absorber and method of manufacture

Claim 1

THE PROCESS OF PREPARING A PRODUCT WHICH, WITH RESPECT TO IMPINGING ELECTROMAGNETIC ENERGY, EXHIBITS A HIGH DEGREE OF ABSORPTION AND A CORRESPONDINGLY LOW REFLECTIVITY FACTOR IN THICKNESS NOT EXCEEDING APPROXIMATELY 1/100 OF AN INCH, SAID PROCESS INCLUDING THE STEPS OF: ADDING TO A SELECTED QUANTITY OF UNHEATED MAGNESIUM OXIDE A LARGER QUANTITY OF MAGNESIUM OXIDE THAT HAS BEEN HEATED TO APPROXIMATELY 850*C., AND THEN COMMINUTING THIS MIXTURE USING AN IRON MILL AND IRON BALLS TO APPROXIMATELY 150 MESH; ADDING TO A SELECTED QUANTITY OF UNHEATED FERRIC OXIDE A LARGER QUANTITY OF FERRIC OXIDE THAT HAS BEEN HEATED TO APPROXIMATELY 850*C., AND THEN COMMINUTING THIS MIXTURE USING AN IRON MILL AND IRON BALLS TO APPROXIMATELY 150 MESH; COMBINING THE MAGNESIUM OXIDE MIXTURE AND THE FERRIC OXIDE MIXTURE IN A MOLAR RATIO OF AP PROXIMATELY TWO PARTS BY GRAM-MOLECULAR WEIGHT OF THE FORMER TO THREE PARTS BY GRAM-MOLECULAR WEIGHT OF THE LATTER HEATING THE RESULTING MIXTURE TO APPROXIMATELY 1300*C. AND MAINTAINING SUCH TEMPERATURE FOR APPROXIMATELY ONE HOUR; COOLING APPROXIMATELY TO BETWEEN 400* C. AND 500*C. AT THE RATE OF APPROXIMATELY 20*C. PER SECOND; FURTHER COOLING AT A SLOWER RATE TO ROOM TEMPERATURE; AND THEN COMMUNICATING USING AN IRON MILL AND IRON BALLS THE COOLED PRODUCT SO THAT THE SIZE OF ANY SINGLE PARTICLE THEREOF IS NOT IN EXCESS OF APPROXIMATELY 74 MICRONS.