Y02A 20/00
Water conservation
Official title: Water conservation; Efficient water supply; Efficient water use
Y02A20/00 (Water conservation) appears on 5,926 US grants and 6,086 published applications in this corpus.
Search patents in Y02A- Granted patents
- 5,926
- Published applications
- 6,086
- Assignees
- 2,943
- Inventors
- 12,145
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 62 | 0 |
| 1977 | 71 | 0 |
| 1978 | 65 | 0 |
| 1979 | 67 | 0 |
| 1980 | 79 | 0 |
| 1981 | 59 | 0 |
| 1982 | 95 | 0 |
| 1983 | 54 | 0 |
| 1984 | 46 | 0 |
| 1985 | 48 | 0 |
| 1986 | 41 | 0 |
| 1987 | 50 | 0 |
| 1988 | 39 | 0 |
| 1989 | 51 | 0 |
| 1990 | 37 | 0 |
| 1991 | 84 | 0 |
| 1992 | 101 | 0 |
| 1993 | 91 | 0 |
| 1994 | 77 | 0 |
| 1995 | 68 | 0 |
| 1996 | 69 | 0 |
| 1997 | 53 | 0 |
| 1998 | 74 | 0 |
| 1999 | 66 | 0 |
| 2000 | 66 | 0 |
| 2001 | 69 | 16 |
| 2002 | 77 | 55 |
| 2003 | 64 | 81 |
| 2004 | 64 | 128 |
| 2005 | 63 | 142 |
| 2006 | 82 | 128 |
| 2007 | 65 | 144 |
| 2008 | 70 | 187 |
| 2009 | 92 | 206 |
| 2010 | 124 | 268 |
| 2011 | 131 | 332 |
| 2012 | 152 | 299 |
| 2013 | 171 | 256 |
| 2014 | 210 | 299 |
| 2015 | 201 | 281 |
| 2016 | 189 | 314 |
| 2017 | 221 | 321 |
| 2018 | 249 | 372 |
| 2019 | 294 | 330 |
| 2020 | 296 | 358 |
| 2021 | 268 | 365 |
| 2022 | 271 | 319 |
| 2023 | 277 | 350 |
| 2024 | 266 | 271 |
| 2025 | 248 | 171 |
| 2026 | 99 | 93 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- Y02A 20/124Water desalination2,395
- Y02A 20/20Controlling water pollution2,280
- Y02A 20/40Protecting water resources303
- Y02A 20/108Rainwater harvesting230
- Y02A 20/15Leakage reduction or detection in water storage or distribution210
- Y02A 20/152Water filtration183
- Y02A 20/30Relating to industrial water supply117
- Y02A 20/146Water conservation: using grey water58
Recent patents
- Method of preparing reverse osmosis membrane with charged hydrogel and polyamide double network8 Sep 2026US 12,728,388 B2
- Rain water collection, filtration, and life boat system25 Aug 2026US 12,715,792 B2Intergalactic Services 24/7, LLC
- Recirculating shower system25 Aug 2026US 12,716,219 B2Kohler Mira Limited
- Method for operating separation membrane module, computer-readable recording medium having program recorded thereon, and water production system18 Aug 2026US 12,708,878 B2Toray Industries, Inc.
- Composite semipermeable membrane, spiral membrane element, water treatment system, and water treatment method18 Aug 2026US 12,708,880 B2Nitto Denko Corporation
- Water detection, distribution and monitoring system8 Oct 2026US 2026/0308893 A1Ocean Park Mechanical Inc
- Systems and methods for generating liquid water from air17 Sep 2026US 2026/0273458 A1Arizona Board of Regents on behalf of Arizona State University
- Bathroom system20 Aug 2026US 2026/0243065 A1Kohler Co.
- Systems, methods, and media for emergency water quality management in smart city pipe networks based on internet of things large models20 Aug 2026US 2026/0244190 A1Chengdu Qinchuan Iot Technology Co., Ltd.
- Systems, devices, and methods for electrodialysis-based home-scale desalination13 Aug 2026US 2026/0234033 A1Massachusetts Institute of Technology
Most cited
By later US patents
- Water-mist blower cooling system and its new applications215US 6,293,121 B12001
- Portable, potable water recovery and dispensing apparatus198US 6,182,453 B2Worldwide Water, Inc. · 2001
- Wind-powered electricity generating system including wind energy storage195US 5,384,489 A1995
- Hollow fiber cartridge165US 5,470,469 AE. I. Du Pont de Nemours and Company · 1995
- Offshore wind turbine with multiple wind rotors and floating system156US 7,075,189 B2Ocean Wind Energy Systems · 2006