C02
Treatment of water, waste water, sewage, or sludge
C02 (Treatment of water, waste water, sewage, or sludge) appears on 42,420 US grants and 41,760 published applications in this corpus.
Search patents in C02- Granted patents
- 42,420
- Published applications
- 41,760
- Assignees
- 16,718
- Inventors
- 77,987
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 558 | 0 |
| 1977 | 498 | 0 |
| 1978 | 494 | 0 |
| 1979 | 370 | 0 |
| 1980 | 500 | 0 |
| 1981 | 526 | 0 |
| 1982 | 419 | 0 |
| 1983 | 367 | 0 |
| 1984 | 386 | 0 |
| 1985 | 373 | 0 |
| 1986 | 363 | 0 |
| 1987 | 461 | 0 |
| 1988 | 478 | 0 |
| 1989 | 562 | 0 |
| 1990 | 534 | 0 |
| 1991 | 612 | 0 |
| 1992 | 662 | 0 |
| 1993 | 705 | 0 |
| 1994 | 639 | 0 |
| 1995 | 696 | 0 |
| 1996 | 719 | 0 |
| 1997 | 732 | 0 |
| 1998 | 754 | 0 |
| 1999 | 812 | 0 |
| 2000 | 846 | 0 |
| 2001 | 935 | 197 |
| 2002 | 818 | 849 |
| 2003 | 778 | 1013 |
| 2004 | 699 | 1129 |
| 2005 | 603 | 1205 |
| 2006 | 652 | 1213 |
| 2007 | 696 | 1207 |
| 2008 | 698 | 1348 |
| 2009 | 663 | 1339 |
| 2010 | 860 | 1564 |
| 2011 | 827 | 1565 |
| 2012 | 886 | 1594 |
| 2013 | 957 | 1728 |
| 2014 | 1080 | 1958 |
| 2015 | 1094 | 1931 |
| 2016 | 1180 | 1986 |
| 2017 | 1348 | 1990 |
| 2018 | 1532 | 2020 |
| 2019 | 1679 | 2087 |
| 2020 | 1750 | 2258 |
| 2021 | 1643 | 2223 |
| 2022 | 1552 | 2095 |
| 2023 | 1439 | 2010 |
| 2024 | 1505 | 2003 |
| 2025 | 1524 | 1840 |
| 2026 | 956 | 1408 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subclasses
Granted patents
Recent patents
- Control center box and flexible bathtub6 Oct 2026US 12,751,582 B2Jiaxing Virpol Sanitary Ware co., LTD.
- Hybrid system and method of waste heat utilization-based photovoltaic power generation and seawater desalination6 Oct 2026US 12,752,240 B2Xi' An Jiaotong University
- Preparation method of high-efficiency gel for seawater desalination6 Oct 2026US 12,752,249 B2Shanghai Maritime University
- Silica-based nanoparticles for PFAS remediation6 Oct 2026US 12,752,323 B2Regents of the University of Minnesota
- Composite filter and water purifier including same6 Oct 2026US 12,753,091 B2Coway Co., Ltd.
- Automated liquid dispensing device8 Oct 2026US 2026/0305569 A1Automated Pet Care Products, LLC d/b/a WHISKER
- Evaporator for ambient water bodies, and related system and method8 Oct 2026US 2026/0306964 A1Resource West, Inc.
- Filtration manifold with integrated bypass8 Oct 2026US 2026/0307010 A1Midea Group Co., Ltd.
- Salt-rejecting continuous passive solar thermal desalination via thin-film condensation8 Oct 2026US 2026/0307012 A1The Regents of the University of California
- Contorted polyamide membranes and methods of use thereof8 Oct 2026US 2026/0307019 A1University of Houston System
Most cited
By later US patents
- Purification of saline water838US 4,036,749 A1977
- Methods and systems for improved dosing of a chemical treatment, such as chlorine dioxide, into a fluid stream, such as a wastewater stream595US 6,949,196 B2Fkos, LLC · 2005
- UV-emitting phosphor and lamp containing same525US 7,396,491 B2Osram Sylvania Inc. · 2008
- Hot water disinfection of dialysis machines, including the extracorporeal circuit thereof490US 5,591,344 AAksys, Ltd. · 1997
- Magnetic iron-dextran microspheres466US 4,452,773 ACanadian Patents and Development Limited · 1984