C02F 2101/16
Nitrogen compounds
Official title: Nitrogen compounds, e.g. ammonia
C02F2101/16 (Nitrogen compounds) appears on 1,390 US grants and 1,722 published applications in this corpus.
Search patents in C02F- Granted patents
- 1,390
- Published applications
- 1,722
- Assignees
- 1,135
- Inventors
- 4,356
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 13 | 0 |
| 1977 | 9 | 0 |
| 1978 | 8 | 0 |
| 1979 | 9 | 0 |
| 1980 | 10 | 0 |
| 1981 | 5 | 0 |
| 1982 | 8 | 0 |
| 1983 | 7 | 0 |
| 1984 | 8 | 0 |
| 1985 | 9 | 0 |
| 1986 | 7 | 0 |
| 1987 | 9 | 0 |
| 1988 | 7 | 0 |
| 1989 | 5 | 0 |
| 1990 | 6 | 0 |
| 1991 | 10 | 0 |
| 1992 | 12 | 0 |
| 1993 | 16 | 0 |
| 1994 | 15 | 0 |
| 1995 | 13 | 0 |
| 1996 | 13 | 0 |
| 1997 | 11 | 0 |
| 1998 | 10 | 0 |
| 1999 | 9 | 0 |
| 2000 | 11 | 0 |
| 2001 | 14 | 4 |
| 2002 | 16 | 17 |
| 2003 | 26 | 30 |
| 2004 | 16 | 24 |
| 2005 | 20 | 33 |
| 2006 | 18 | 19 |
| 2007 | 21 | 31 |
| 2008 | 23 | 35 |
| 2009 | 24 | 42 |
| 2010 | 25 | 45 |
| 2011 | 21 | 51 |
| 2012 | 36 | 43 |
| 2013 | 27 | 53 |
| 2014 | 31 | 57 |
| 2015 | 40 | 95 |
| 2016 | 37 | 89 |
| 2017 | 57 | 105 |
| 2018 | 76 | 99 |
| 2019 | 91 | 109 |
| 2020 | 84 | 101 |
| 2021 | 63 | 125 |
| 2022 | 92 | 121 |
| 2023 | 64 | 104 |
| 2024 | 85 | 105 |
| 2025 | 90 | 117 |
| 2026 | 53 | 68 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Electrochemical nitrogen and phosphorus removal device and method29 Sep 2026US 12,747,176 B2Beijing Drainage Group Co., Ltd
- Method of reducing nitrogen oxide concentration in sample, bioreactor, and plug flow reactor29 Sep 2026US 12,747,458 B2Korea Advanced Institute of Science and Technology
- Efficient nitrogen and phosphorus removal process system for mariculture tail water treatment15 Sep 2026US 12,735,339 B2Tianjin Research Institute for Water Transport Engineering, M.O.T.
- Treating produced water for beneficial reuse8 Sep 2026US 12,729,139 B2Renovo Resources LLC
- Integrated heat exchanger and sour water stripper1 Sep 2026US 12,722,986 B2Air Producuts and Chemicals, Inc.
- Strain of paenibacillus glycanilyticus and application thereof in nitrogen removal treatment of nitrogen-containing aquaculture wastewater8 Oct 2026US 2026/0308511 A1Zhejiang Marine Fisheries Research Institute
- Water treatment method and water treatment apparatus1 Oct 2026US 2026/0296934 A1Organo Corporation
- Process and system for degrading a chemical compound in a liquid stream1 Oct 2026US 2026/0296942 A1Aquasoil S.R.L.
- Integrated Method and Apparatus for Treatment of Produced Water24 Sep 2026US 2026/0285725 A1Tetra Technologies, Inc.
- Hybrid electrodialysis and electrolysis systems and processes24 Sep 2026US 2026/0285728 A1Pani Clean, Inc.
Most cited
By later US patents
- Electrolytic apparatus and methods for purification of aqueous solutions93US 6,315,886 B1The Electrosynthesis Company, Inc. · 2001
- Method and system for purifying liquid88US 3,985,648 AAlmag Pollution Control Corporation · 1976
- Utilities container82US 6,393,775 B12002
- Combined membrane and sorption process for selective ion removal79US 4,806,244 AThe Dow Chemical Company · 1989
- Electrolytic water purification process78US 5,531,865 A1996