B01J 31/0235
Nitrogen containing compounds
Official title: {Nitrogen containing compounds}
B01J31/0235 (Nitrogen containing compounds) appears on 1,340 US grants and 1,135 published applications in this corpus.
Search patents in B01J- Granted patents
- 1,340
- Published applications
- 1,135
- Assignees
- 759
- Inventors
- 3,737
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 14 | 0 |
| 1977 | 14 | 0 |
| 1978 | 16 | 0 |
| 1979 | 14 | 0 |
| 1980 | 18 | 0 |
| 1981 | 31 | 0 |
| 1982 | 25 | 0 |
| 1983 | 20 | 0 |
| 1984 | 18 | 0 |
| 1985 | 24 | 0 |
| 1986 | 11 | 0 |
| 1987 | 7 | 0 |
| 1988 | 10 | 0 |
| 1989 | 10 | 0 |
| 1990 | 9 | 0 |
| 1991 | 15 | 0 |
| 1992 | 18 | 0 |
| 1993 | 26 | 0 |
| 1994 | 21 | 0 |
| 1995 | 17 | 0 |
| 1996 | 13 | 0 |
| 1997 | 13 | 0 |
| 1998 | 41 | 0 |
| 1999 | 28 | 0 |
| 2000 | 26 | 0 |
| 2001 | 35 | 7 |
| 2002 | 36 | 22 |
| 2003 | 28 | 35 |
| 2004 | 27 | 40 |
| 2005 | 13 | 32 |
| 2006 | 25 | 24 |
| 2007 | 17 | 38 |
| 2008 | 15 | 27 |
| 2009 | 17 | 28 |
| 2010 | 29 | 44 |
| 2011 | 24 | 44 |
| 2012 | 20 | 31 |
| 2013 | 31 | 54 |
| 2014 | 36 | 37 |
| 2015 | 49 | 42 |
| 2016 | 40 | 69 |
| 2017 | 49 | 39 |
| 2018 | 50 | 71 |
| 2019 | 53 | 66 |
| 2020 | 61 | 59 |
| 2021 | 51 | 71 |
| 2022 | 47 | 60 |
| 2023 | 36 | 66 |
| 2024 | 33 | 54 |
| 2025 | 30 | 44 |
| 2026 | 29 | 31 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- B01J 31/0239Quaternary ammonium compounds461
- B01J 31/0237Amines437
- B01J 31/0244With nitrogen contained as ring member in aromatic compounds or moieties292
- B01J 31/0245Being derivatives of carboxylic or carbonic acids266
- B01J 31/0254On mineral substrates132
- B01J 31/0252With a metal-nitrogen link63
- B01J 31/0241Imines or enamines34
Recent patents
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- Novel compound or salt thereof, catalyst, method of preparing novel compound or salt thereof and method of preparing mannich product8 Oct 2026US 2026/0308178 A1Okinawa Institute of Science and Technology School Corporation
- Supported transition metal nanoparticle catalyst and use thereof as a hydrogenation catalyst1 Oct 2026US 2026/0295565 A1BASF SE
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Most cited
By later US patents
- Crystalline silicates and method of preparing the same142US 3,941,871 AMobil Oil Corporation · 1976
- Phase transfer catalyzed preparation of aromatic polyether polymers113US 5,229,482 AGeneral Electric Company · 1993
- Catalyst system and the use thereof70US 6,953,829 B2Basell Polyolefine GmbH · 2005
- Crystalline silicates and method for preparing same67US 4,104,294 AUnion Carbide Corporation · 1978
- Homogeneous catalyst formulations for methanol production67US 4,992,480 AAssociated Universities, Inc. · 1991