B01J 31/2273
With only nitrogen as heteroatomic ring members
Official title: {with only nitrogen as heteroatomic ring members, e.g. 1,3-diarylimidazoline-2-ylidenes}
B01J31/2273 (With only nitrogen as heteroatomic ring members) appears on 270 US grants and 376 published applications in this corpus.
Search patents in B01J- Granted patents
- 270
- Published applications
- 376
- Assignees
- 210
- Inventors
- 772
- Latest grant
- 9 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1997 | 2 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 2 | 2 |
| 2002 | 3 | 6 |
| 2003 | 10 | 8 |
| 2004 | 6 | 5 |
| 2005 | 4 | 10 |
| 2006 | 6 | 11 |
| 2007 | 7 | 5 |
| 2008 | 3 | 7 |
| 2009 | 6 | 7 |
| 2010 | 10 | 11 |
| 2011 | 2 | 17 |
| 2012 | 7 | 9 |
| 2013 | 10 | 20 |
| 2014 | 12 | 12 |
| 2015 | 13 | 30 |
| 2016 | 16 | 20 |
| 2017 | 24 | 15 |
| 2018 | 12 | 14 |
| 2019 | 10 | 26 |
| 2020 | 18 | 24 |
| 2021 | 16 | 25 |
| 2022 | 19 | 25 |
| 2023 | 19 | 17 |
| 2024 | 16 | 26 |
| 2025 | 10 | 19 |
| 2026 | 6 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Hydrogen storage based on aqueous formate- bicarbonate (hydrogen carbonate) equilibrium9 Jun 2026US 12,649,654 B2Hydrogen Revolution Hungary Kft.
- Ruthenium complexes, methods of their preparation and application thereof in olefin cross metathesis12 May 2026US 12,624,060 B2Apeiron Synthesis S. A.
- Method for producing fluorine-containing olefin31 Mar 2026US 12,590,047 B2AGC Inc.
- Air-stable ni(0)-olefin complexes and their use as catalysts or precatalysts24 Feb 2026US 12,558,677 B2Studiengesellschaft Kohle mbH
- Ammonia manufacturing apparatus and ammonia manufacturing method10 Feb 2026US 12,546,018 B2Kabushiki Kaisha Toshiba
- Method for producing nitrogenated compound6 Aug 2026US 2026/0226088 A1Idemitsu Kosan Co., Ltd.
- Polymerizable composition and norbornene resin7 May 2026US 2026/0125501 A1Rimtec Corporation
- Novel ruthenium complexes, method of their synthesis, intermediate compounds used in this method, method of their synthesis and use of novel ruthenium complexes in olefin metathesis reactions2 Apr 2026US 2026/0092080 A1Uniwersytet Warszawski
- Cyclic olefin polymer having high cis double bond content15 Jan 2026US 2026/0015440 A1Board of Regents, The University of Texas System
- Ruthenium catalysts and methods thereof8 Jan 2026US 2026/0008037 A1The Regents of the University of California
Most cited
By later US patents
- Recyclable metathesis catalysts82US 6,921,735 B2The Trustees of Boston College · 2005
- Imidazolidine-based metal carbene metathesis catalysts79US 7,329,758 B1California Institute of Technology · 2008
- Metathesis of unsaturated fatty acid esters or unsaturated fatty acids with lower olefins70US 7,119,216 B2Dow Global Technologies LLC · 2006
- Alkylidene complexes of ruthenium containing N-heterocyclic carbene ligands; use as highly active, selective catalysts for olefin metathesis63US 7,378,528 B2Evonik Degussa GmbH · 2008
- Hexacoordinated ruthenium or osmium metal carbene metathesis catalysts58US 6,759,537 B2California Institute of Technology · 2004