Arrangements of installations for treating ballast water, waste water, sewage, sludge, or

Official title: Arrangements of installations for treating {ballast water,} waste water, sewage, {sludge, or refuse}, or for preventing environmental pollution not otherwise provided for; ({centrifugal bilge-water separators B04; discharge of refuse, e.g. for ash B63B17/06; arrangements on tanks for fuel or the like for minimizing pollution by accidents B63B17/0036, associated with cargo tanks B63B25/082; vessels for collecting pollution from open water B63B35/30;} soil-water discharges B63B29/16; {treating waste water, sewage, or sludge, in general, C02F; cleaning or keeping clear the surface of open water, in general E02B15/00})

B63J4/00 (Arrangements of installations for treating ballast water, waste water, sewage, sludge, or) appears on 266 US grants and 341 published applications in this corpus.