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Spinel-type spherical, black iron oxide particles and process for the producing the same

  • US 5,336,421 A
  • Filed: 08/10/1993
  • Issued: 08/09/1994
  • Est. Priority Date: 11/22/1990
  • Status: Expired due to Fees
First Claim
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1. Spinel-type spherical black iron oxide particles having the formula:

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    space="preserve" listing-type="equation">Zn.sub.x Fe.sub.1-x O.Fe.sub.2 O.sub.3

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