Y02A 20/20
Controlling water pollution
Official title: Controlling water pollution; Waste water treatment
Y02A20/20 (Controlling water pollution) appears on 2,280 US grants and 1,876 published applications in this corpus.
Search patents in Y02A- Granted patents
- 2,280
- Published applications
- 1,876
- Assignees
- 1,205
- Inventors
- 4,469
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 38 | 0 |
| 1977 | 53 | 0 |
| 1978 | 46 | 0 |
| 1979 | 36 | 0 |
| 1980 | 47 | 0 |
| 1981 | 31 | 0 |
| 1982 | 46 | 0 |
| 1983 | 33 | 0 |
| 1984 | 23 | 0 |
| 1985 | 28 | 0 |
| 1986 | 24 | 0 |
| 1987 | 25 | 0 |
| 1988 | 16 | 0 |
| 1989 | 26 | 0 |
| 1990 | 23 | 0 |
| 1991 | 56 | 0 |
| 1992 | 62 | 0 |
| 1993 | 53 | 0 |
| 1994 | 43 | 0 |
| 1995 | 40 | 0 |
| 1996 | 39 | 0 |
| 1997 | 30 | 0 |
| 1998 | 36 | 0 |
| 1999 | 30 | 0 |
| 2000 | 28 | 0 |
| 2001 | 25 | 8 |
| 2002 | 30 | 21 |
| 2003 | 21 | 34 |
| 2004 | 23 | 45 |
| 2005 | 20 | 55 |
| 2006 | 29 | 52 |
| 2007 | 25 | 38 |
| 2008 | 33 | 66 |
| 2009 | 36 | 61 |
| 2010 | 49 | 68 |
| 2011 | 34 | 111 |
| 2012 | 52 | 110 |
| 2013 | 57 | 86 |
| 2014 | 83 | 110 |
| 2015 | 67 | 89 |
| 2016 | 63 | 95 |
| 2017 | 71 | 105 |
| 2018 | 81 | 116 |
| 2019 | 89 | 105 |
| 2020 | 97 | 114 |
| 2021 | 83 | 104 |
| 2022 | 77 | 104 |
| 2023 | 69 | 69 |
| 2024 | 69 | 60 |
| 2025 | 60 | 25 |
| 2026 | 25 | 25 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Utilizing alternative energy for water purification, water disposal, industrial heat, and electricity18 Aug 2026US 12,709,553 B2Katz Water Tech, LLC
- System for desalinating saltwater16 Jun 2026US 12,654,111 B2
- Solar thermal panel and method for producing water2 Jun 2026US 12,644,261 B2Akua S.R.L.
- Water pumps for landscape water26 May 2026US 12,638,017 B2Suzhou University of Science and Technology
- Buoyant water purification pad19 May 2026US 12,630,447 B2Maximideas Inc.
- Methods And Systems For Separating Metals6 Aug 2026US 2026/0224998 A1Nant Holdings IP, LLC
- Highly efficient, salt rejecting, wick-free solar evaporation9 Jul 2026US 2026/0193107 A1Massachusetts Institute of Technology
- Absorption devices, materials, and methods18 Jun 2026US 2026/0166518 A1Celgard, LLC
- Boom and jib crane provided with boom18 Jun 2026US 2026/0167464 A1Xuzhou Heavy Machinery Co., Ltd.
- Mobile light processing system18 Jun 2026US 2026/0167525 A1Focal Technologies Incorporated
Most cited
By later US patents
- Portable, potable water recovery and dispensing apparatus198US 6,182,453 B2Worldwide Water, Inc. · 2001
- Method of an apparatus for sterilizing aqueous media, more particularly drinking water122US 4,857,204 A1989
- Portable, potable water recovery and dispensing apparatus121US 6,058,718 A2000
- Apparatus for the production of freshwater from extremely hot and humid air116US 6,684,648 B2Fakieh Research & Development Center · 2004
- Hand-held ultraviolet water purification system using solid state devices102US 6,579,495 B1Hydro-Photon, Inc. · 2003