C02F 2209/28
Ch4
C02F2209/28 (Ch4) appears on 21 US grants and 24 published applications in this corpus.
Search patents in C02F- Granted patents
- 21
- Published applications
- 24
- Assignees
- 28
- Inventors
- 60
- Latest grant
- 27 May 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 1 | 0 |
| 2014 | 0 | 2 |
| 2015 | 0 | 1 |
| 2016 | 1 | 2 |
| 2017 | 1 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 2 |
| 2020 | 3 | 3 |
| 2021 | 3 | 1 |
| 2022 | 1 | 3 |
| 2023 | 1 | 0 |
| 2024 | 0 | 3 |
| 2025 | 2 | 5 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Systems and methods for managing filtration media beds in gas and liquid filtration apparatus27 May 2025US 12,312,548 B2Pure Air Filtration, LLC
- Treatments of organic waste14 Jan 2025US 12,195,375 B2Glasport Bio Limited
- Automated manifold for removing digestate from a lagoon digester20 Jun 2023US 11,680,000 B2
- Equilibrator for rapid and continuous detection of a gas in a liquid9 Aug 2022US 11,406,947 B2U. S. Environmental Protection Agency
- Modular portable renewable energy microgeneration system14 Dec 2021US 11,198,628 B2Seab Power Limited
- Systems and methods for managing filtration media beds in gas and liquid filtration apparatus21 Aug 2025US 2025/0263616 A1
- Treatments of organic waste29 May 2025US 2025/0171343 A1Glasport Bio Limited
- Coagulation control method and system15 May 2025US 2025/0154032 A1Usalco, LLC
- Systems and methods for managing filtration media beds in gas and liquid filtration apparatus20 Mar 2025US 2025/0092327 A1Pure Air Filtration, LLC
- Method and apparatus for recovering methane from a flow of water23 Jan 2025US 2025/0026668 A1Bluemethane Group Ltd
Most cited
By later US patents
- Biological treatment of materials92US 5,846,424 AKhudenko Engineering, Inc. · 1998
- In-sewer treatment of wastewater and sludges81US 6,015,496 A2000
- Treatment of wastewater and sludges77US 5,616,241 A1997
- Counterflow microbiological processes67US 5,514,278 A1996
- Treatment of wastewater and sludges50US 5,514,277 A1996