List of IPC and CPC codes used in patent applications in water related technologies:
Faucets and showers
"Self-closing valves, i.e. closing automatically after operation, in which the closing movement, either retarded or not, starts immediately
after opening" F16K21/06-12
Self-closing valves, i.e. closing automatically after operation, closing after a predetermined quantity of fluid has been delivered F16K 21/16-20
Aeration of water
Arrangement or mounting of devices, e.g. valves, for venting or aerating or draining F16L 55/07
Jet regulators with aerating means E03C 1/084
Sanitation (dual-flush toilets, dry toilets, closed-circuit toilets)
Flushing devices discharging variable quantities of water E03D 3/12
Cisterns discharging variable quantities of water E03D 1/14
Urinals without flushing A47K 11/12
Dry closets A47K 11/02
Waterless or low-flush urinals E03D13/007
Special constructions of flushing devices with recirculation of bowl-cleaning fluid E03D5/016
Greywater
Greywater supply systems E03B1/041
Home appliances
Optimisation of water quantity (for dishwashers) Y02B 40/46
Optimisation of water quantity (for washing machines) Y02B 40/56
Irrigation water conservation
Drip irrigation
"Watering arrangements located above the soil which make use of perforated pipe-lines or pipe-lines with dispensing fittings, e.g. for
drip irrigation" A01G 25/02
Watering arrangements making use of perforated pipe-lines located in the soil A01G 25/06
Control of watering
Control of watering A01G 25/16
Water conservation in thermoelectric power production
Combustion heat from one cycle heating the fluid in another cycle F01K 23/08-10
"Non-positive-displacement machines or engines, e.g. steam turbines / Preventing or minimizing internal leakage of working fluid, e.g.
between stages" F01D 11
Water distribution
Piping – reducing leakage and leakage monitoring
Pipe-line systems / Protection or supervision of installations / Preventing, monitoring, or locating loss F17D5/02 and E03
Devices for covering leaks in pipes or hoses, e.g. hose-menders F16L55/16 and E03
Investigating fluid tightness of structures, by detecting the presence of fluid at the leakage point "G01M 3/08 or
G01M 3/14 or
G01M 3/18 or
G01M 3/22 or
G01M 3/28 and E03"
2.2. SUPPLY-SIDE TECHNOLOGIES (water availability)
2.2.1. Water collection (rain, surface and ground-water)
Underground water collection
Use of pumping plants or installations E03B 5
Methods or installations for obtaining or collecting drinking water or tap water from underground E03B 3/06-26
Surface water collection
Methods or installations for drawing-off water E03B 9
Methods or installations for obtaining or collecting drinking water or tap water from surface water E03B 3/04; 28-38
Rainwater water collection
Methods or installations for obtaining or collecting drinking water or tap water from rainwater E03B 3/02
Special vessels for collecting or storing rain-water for use in the household, e.g. water-butts E03B 3/03
Not elsewhere classified
Methods or installations for obtaining or collecting drinking water or tap water; rainwater, surface water, or groundwater "E03B 3/00
E03B 3/40"
Water storage
Arrangements or adaptations of tanks for water supply E03B 11