"patent published in 1973"@en . . . . "US3739061" . . . . . "Elger-GW" . "Manufacture of Synthetic Rutile"@en . "Manufacture of Synthetic Rutile"@en . "1973-06-01T00:00:00Z"^^ . "Manufacture of Synthetic Rutile"@en . . "Rhoads-SC" . . "Manufacture of Synthetic Rutile"@en . . . . "Stickney-WA" . . . "10011955" . . . . "Hunter-WL" . . .