Removing iron impurities from glass-making sand

Removing mineral matter from solid carbonaceous fuels

Repeating flotation machine

Replacement discharge electrode for electrostatic...

Resin separator

Resinous constituent extracting process

Resistive anode for corona discharge devices

Resistive anode for electrostatic precipitation

Retainer for use with a corona ground element of an...

Retorting of oil shale using co2 as heat carrier

Reverse froth flotation of calcite ore

Reverse iron ore flotation by collectors in aqueous...

Rf applicator for in situ heating

Riffle bars

Rigid charging electrode for electrostatic filter

Rigid discharge electrode

Rigid electrode ionization for packed bed scrubbers

River and dry land pivotable gold sluice

Rotary electrical precipitator

Rotary electrostatic filter