C23F 11/149
Heterocyclic compounds containing nitrogen as hetero atom
Official title: {Heterocyclic compounds containing nitrogen as hetero atom}
C23F11/149 (Heterocyclic compounds containing nitrogen as hetero atom) appears on 389 US grants and 345 published applications in this corpus.
Search patents in C23F- Granted patents
- 389
- Published applications
- 345
- Assignees
- 218
- Inventors
- 917
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 3 | 0 |
| 1978 | 2 | 0 |
| 1979 | 3 | 0 |
| 1980 | 5 | 0 |
| 1981 | 3 | 0 |
| 1982 | 2 | 0 |
| 1983 | 6 | 0 |
| 1984 | 3 | 0 |
| 1985 | 0 | 0 |
| 1986 | 3 | 0 |
| 1987 | 7 | 0 |
| 1988 | 9 | 0 |
| 1989 | 6 | 0 |
| 1990 | 4 | 0 |
| 1991 | 5 | 0 |
| 1992 | 8 | 0 |
| 1993 | 12 | 0 |
| 1994 | 12 | 0 |
| 1995 | 11 | 0 |
| 1996 | 10 | 0 |
| 1997 | 2 | 0 |
| 1998 | 15 | 0 |
| 1999 | 7 | 0 |
| 2000 | 11 | 0 |
| 2001 | 6 | 1 |
| 2002 | 12 | 4 |
| 2003 | 7 | 8 |
| 2004 | 4 | 6 |
| 2005 | 4 | 6 |
| 2006 | 4 | 13 |
| 2007 | 2 | 11 |
| 2008 | 4 | 5 |
| 2009 | 1 | 8 |
| 2010 | 8 | 12 |
| 2011 | 6 | 5 |
| 2012 | 7 | 10 |
| 2013 | 8 | 5 |
| 2014 | 4 | 15 |
| 2015 | 9 | 9 |
| 2016 | 6 | 23 |
| 2017 | 14 | 14 |
| 2018 | 7 | 22 |
| 2019 | 19 | 16 |
| 2020 | 20 | 23 |
| 2021 | 18 | 17 |
| 2022 | 11 | 17 |
| 2023 | 15 | 22 |
| 2024 | 17 | 27 |
| 2025 | 12 | 22 |
| 2026 | 9 | 24 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Aqueous formulation of oil-soluble corrosion inhibitor, and preparation method and regeneration method thereof22 Sep 2026US 12,742,119 B2PetroChina Company Limited
- Corrosion-resistant articles and methods for making such18 Aug 2026US 12,709,687 B2Saudi Arabian Oil Company
- One-pot homogeneous process for the large scale manufacture of 2-substituted benzimidazoles4 Aug 2026US 12,698,267 B2Ecolab USA Inc.
- Coolant with low electrical conductivity4 Aug 2026US 12,698,430 B2BASF SE
- Methods and compositions to reduce azoles and AOX corrosion inhibitors9 Jun 2026US 12,649,675 B2Bl Technologies, Inc.
- Bis-pyridinium compounds, materials including such, and uses thereof such as in corrosion resistance17 Sep 2026US 2026/0274796 A1Saudi Arabian Oil Company
- Corrosion inhibitor compositions and methods of use thereof27 Aug 2026US 2026/0250570 A1ChampionX LLC
- Fire retardant compositions containing one or more surfactants13 Aug 2026US 2026/0233045 A1Perimeter Solutions LP
- Dipyrazolopyridine-based corrosion inhibitor compositions and methods thereof16 Jul 2026US 2026/0201242 A1King Fahd University of Petroleum and Minerals
- Pyridinium salts-based chemicals that include sulfur9 Jul 2026US 2026/0193186 A1Saudi Arabian Oil Company
Most cited
By later US patents
- Mixtures of hexahydrotriazines useful as H.sub.2 S scavengers115US 5,347,004 ABaker Hughes Incorporated · 1994
- Method and composition for inhibiting corrosion in aqueous systems92US 6,585,933 B1BetzDearborn Inc. · 2003
- Fire retardant compositions containing ammonium polyphosphate and iron additives for corrosion inhibition63US 6,802,994 B1Astaris LLC · 2004
- Composition for treating copper or copper alloy surfaces54US 5,532,094 AMec Company Ltd. · 1996
- Process for scavenging H.sub.2 S by mixtures of hexahydrotriazines44US 5,554,349 ABanker Hughes Incorporated · 1996