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SYNTHETIC AGGREGATES

  • US 3,785,842 A
  • Filed: 01/06/1971
  • Issued: 01/15/1974
  • Est. Priority Date: 01/16/1970
  • Status: Expired due to Term
First Claim
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2. A method according to claim 1 wherein the Al2O3 is in the range 15-40 percent, the FeO content in the range 5-40 percent, the MgO content in the range 5-40 percent, and the combined content of FeO and MgO is sufficient to produce at least 25 percent of spinels in the aggregate produced.

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