DAVID W TRUNKO
Engineers in Lafayette, NY

4698289, Oct 6, 1987

Feb 27, 1986

6/833992

Robert G. Aldrich - Manlius NY
Geoffrey H. Earl - Erieville NY
David W. Trunko - Lafayette NY

Halomet Inc. - Syracuse NY

G01G 900, G01G 914, G01G 910, C03G 4908

4301066

A process for making a ferrite spherical particulate toner carrier core from a raw fly ash comprising recovering the magnetic particles from the non-magnetic particles of the raw fly ash; selecting a desired size for the particles of the raw fly ash and screening the fly ash to obtain the desired sized particles; and purifying the resultant raw fly ash to obtain a ferrite composition having a particle size from 20-300 microns, in which the particles are essentially spherical, having an apparent density of at least 1. 8 g/cm. sup. 3, a saturation magnetization of 43-70 emu/g, a remanence of 5 emu/g or less, a Hall Flow of 20 sec. or greater/50 g.

4592988, Jun 3, 1986

Aug 15, 1984

6/640813

Robert G. Aldrich - Manlius NY
Geoffrey H. Earl - Erieville NY
David W. Trunko - Lafayette NY

Halomet, Inc. - Syracuse NY

G03G 900, G03G 914, G03G 910, C01G 4908

430107

A ferrite toner carrier core composition derived from flyash comprising a mixture of spherical particulates of the general formula ##EQU1## wherein iron is the principal metallic element and i,j,k denote the number of atoms of monovalent, divalent and trivalent atoms present in one mole of the compound, and M. sub. x denotes monovalent atoms from Group IA of the Periodic Table, the alkali metals, usually sodium or potassium, alone or together. M. sub. y denotes divalent atoms from Group IIA of the Periodic Table, the alkali earth metals, usually magnesium or calcium, alone or together. M. sub. z denotes trivalent atoms from Group IVB, usually titanium, Group IVA, usually silicon and Group IIIA, usually aluminum. All permutations and combinations may be present.