B01J 31/249
Spiro-condensed ring systems
Official title: {Spiro-condensed ring systems}
B01J31/249 (Spiro-condensed ring systems) appears on 25 US grants and 25 published applications in this corpus.
Search patents in B01J- Granted patents
- 25
- Published applications
- 25
- Assignees
- 16
- Inventors
- 54
- Latest grant
- 8 Apr 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 2000 | 1 | 0 |
| 2001 | 2 | 1 |
| 2002 | 1 | 0 |
| 2003 | 1 | 1 |
| 2004 | 0 | 1 |
| 2005 | 1 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 3 |
| 2014 | 3 | 1 |
| 2015 | 3 | 2 |
| 2016 | 2 | 1 |
| 2017 | 1 | 2 |
| 2018 | 0 | 2 |
| 2019 | 2 | 1 |
| 2020 | 3 | 1 |
| 2021 | 1 | 3 |
| 2022 | 2 | 1 |
| 2023 | 0 | 1 |
| 2024 | 1 | 0 |
| 2025 | 1 | 2 |
By publication year. Applications have been published since 2001.
Recent patents
- Preparation method for and application of chiral spirocyclic phosphine-nitrogen-phosphine tridentate ligand and iridium catalyst thereof8 Apr 2025US 12,269,835 B2
- Synthesis and use of oxa-spirodiphosphine ligand27 Aug 2024US 12,071,444 B2Shenzhen Catalys Technology Co., Ltd
- Compound of 3,3,3′,3′-tetramethyl-1,1′-spirobiindane-based phosphine ligand, and preparation method thereof20 Dec 2022US 11,530,230 B2Zhejiang University
- Synthesis and use of oxa-spirodiphosphine ligand12 Apr 2022US 11,299,507 B2Shenzhen Catalys Technology Co., Ltd
- 3,3,3′,3′-tetramethyl-1,1′-spirobiindane-based phosphinooxazoline ligand compound, preparation method and uses of the same7 Sep 2021US 11,111,258 B2Zhejiang University
- Chiral spirocyclic compounds and methods of preparation and use thereof17 Jul 2025US 2025/0229262 A1The Hong Kong University of Science and Technology
- Process for unprotected asymmetric preparation of nicotine13 Mar 2025US 2025/0084057 A1Shenzhen Catalys Technology Co., Ltd
- Preparation method for and application of chiral spirocyclic phosphine-nitrogen-phosphine tridentate ligand and iridium catalyst thereof18 May 2023US 2023/0151035 A1Zhejiang Jiuzhou Pharmaceutical Co., Ltd.
- Synthesis and use of oxa-spirodiphosphine ligand16 Jun 2022US 2022/0185835 A1Shenzhen Catalys Technology Co., Ltd
- Oxa-spirodiphosphine ligand and method for asymmetric hydrogenation of alpha, beta-unsaturated carboxylic acids4 Nov 2021US 2021/0340168 A1Shenzhen Catalys Technology Co., Ltd
Most cited
By later US patents
- Asymmetric synthesis catalyzed by transition metal complexes with cyclic chiral phosphine ligands16US 6,037,500 AThe Penn State Research Foundation · 2000
- Chiral phosphines, transition metal complexes thereof and uses thereof in asymmetric reactions7US 6,576,772 B1The Penn State Research Foundation · 2003
- Phosphine-based catalysts useful for the telomerization of butadiene7US 8,779,164 B2Dow Global Technologies LLC · 2014
- Phosphine ligands for catalytic reactions6US 8,841,487 B2AbbVie Inc. · 2014
- Asymmetric synthesis catalyzed by transition metal complexes with rigid chiral ligands4US 6,380,416 B2The Penn State Research Foundation · 2002