B01J 31/0281
The nitrogen being a ring member
Official title: {the nitrogen being a ring member}
B01J31/0281 (The nitrogen being a ring member) appears on 216 US grants and 290 published applications in this corpus.
Search patents in B01J- Granted patents
- 216
- Published applications
- 290
- Assignees
- 141
- Inventors
- 633
- Latest grant
- 20 Jan 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 3 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 0 | 0 |
| 2000 | 6 | 0 |
| 2001 | 5 | 2 |
| 2002 | 3 | 5 |
| 2003 | 4 | 8 |
| 2004 | 5 | 8 |
| 2005 | 2 | 9 |
| 2006 | 4 | 1 |
| 2007 | 6 | 14 |
| 2008 | 0 | 4 |
| 2009 | 1 | 13 |
| 2010 | 16 | 23 |
| 2011 | 9 | 23 |
| 2012 | 7 | 19 |
| 2013 | 14 | 23 |
| 2014 | 20 | 9 |
| 2015 | 10 | 8 |
| 2016 | 12 | 13 |
| 2017 | 11 | 10 |
| 2018 | 8 | 26 |
| 2019 | 11 | 11 |
| 2020 | 21 | 11 |
| 2021 | 9 | 7 |
| 2022 | 4 | 4 |
| 2023 | 8 | 14 |
| 2024 | 8 | 8 |
| 2025 | 3 | 13 |
| 2026 | 1 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Depolymerization of polymers with ester, ether and carbonate linkages using acidic ionic liquid (AIL) catalyst20 Jan 2026US 12,528,929 B2Council of Scientific and Industrial Research An Indian Resgistered Body Incorporated Under the Regn. of Soc. Act (Act Xxi of 1860)
- Method for recycling polyester fabrics with use of ionic liquid catalyst11 Nov 2025US 12,466,934 B2Nan Ya Plastics Corporation
- Heterogeneous catalyst with multicatalytic activity8 Apr 2025US 12,269,019 B2Instituto Mexicano Del Petroleo
- Ionic liquid catalyst11 Feb 2025US 12,220,687 B2Nan Ya Plastics Corporation
- Catalyst composition for selective hydrogenation with improved characteristics24 Dec 2024US 12,172,147 B2Sud-Chemie AG
- Preparation method of dual-anion catalyst, and use of dual-anion catalyst in catalytic degradation of polyurethane material7 May 2026US 2026/0124609 A1Zhejiang University of Technology
- Method for polyurethane depolymerization19 Mar 2026US 2026/0078235 A1AsociacióN Empresarial Centro TecnolóGico Del Mueble Y La Madera De La RegióN De Murcia
- Catalyst for depolymerizing polycarbonate-based resin, and decomposition method of polycarbonate-based resin, recovery method of catalyst for depolymerizing polycarbonate-based resin using the same5 Feb 2026US 2026/0034539 A1Korea University Research and Business Foundation
- Preparation method of ion catalyst material for pet chemical recycling and pet chemical recycling method8 Jan 2026US 2026/0008036 A1Nan Ya Plastics Corporation
- Catalyst for polyester depolymerization or cyclic ester synthesis, preparation method therefor and use thereof23 Oct 2025US 2025/0325970 A1Sichuan University
Most cited
By later US patents
- Functionalized ionic liquids, and methods of use thereof64US 7,208,605 B2University of South Alabama · 2007
- Perfluorinated amide salts and their uses as ionic conducting materials61US 6,319,428 B1Centre National De La Recherche Scientifique · 2001
- Catalytic composition and process for the alkylation of aliphatic hydrocarbons56US 5,750,455 AInstitut Francais du Petrole · 1998
- Non-aqueous liquid composition with an ionic character and its use as a solvent55US 5,104,840 AInstitut Francais du Petrole · 1992
- Regeneration of ionic liquid catalyst by hydrogenation using a supported catalyst37US 7,691,771 B2Chevron U.S.A.Inc. · 2010