B01J 2531/0241
Rigid ligands
Official title: Rigid ligands, e.g. extended sp2-carbon frameworks or geminal di- or trisubstitution
B01J2531/0241 (Rigid ligands) appears on 606 US grants and 539 published applications in this corpus.
Search patents in B01J- Granted patents
- 606
- Published applications
- 539
- Assignees
- 363
- Inventors
- 1,576
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 8 | 0 |
| 1978 | 13 | 0 |
| 1979 | 6 | 0 |
| 1980 | 7 | 0 |
| 1981 | 15 | 0 |
| 1982 | 10 | 0 |
| 1983 | 4 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 3 | 0 |
| 1987 | 2 | 0 |
| 1988 | 3 | 0 |
| 1989 | 9 | 0 |
| 1990 | 13 | 0 |
| 1991 | 5 | 0 |
| 1992 | 7 | 0 |
| 1993 | 10 | 0 |
| 1994 | 8 | 0 |
| 1995 | 10 | 0 |
| 1996 | 14 | 0 |
| 1997 | 16 | 0 |
| 1998 | 14 | 0 |
| 1999 | 14 | 0 |
| 2000 | 5 | 0 |
| 2001 | 7 | 1 |
| 2002 | 11 | 10 |
| 2003 | 9 | 17 |
| 2004 | 10 | 18 |
| 2005 | 10 | 15 |
| 2006 | 10 | 9 |
| 2007 | 8 | 10 |
| 2008 | 7 | 18 |
| 2009 | 10 | 15 |
| 2010 | 10 | 22 |
| 2011 | 10 | 21 |
| 2012 | 15 | 14 |
| 2013 | 13 | 29 |
| 2014 | 15 | 27 |
| 2015 | 23 | 30 |
| 2016 | 30 | 19 |
| 2017 | 23 | 23 |
| 2018 | 14 | 17 |
| 2019 | 16 | 46 |
| 2020 | 28 | 38 |
| 2021 | 33 | 30 |
| 2022 | 24 | 34 |
| 2023 | 29 | 21 |
| 2024 | 14 | 27 |
| 2025 | 17 | 18 |
| 2026 | 5 | 10 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- B01J 2531/025Ligands with a porphyrin ring system or analogues thereofIndexing code280
- B01J 2531/0252Salen ligands or analoguesIndexing code134
- B01J 2531/0244Pincer-type complexes, i.e. consisting of a tridentate skeleton bound to a metalIndexing code128
- B01J 2531/0255Ligands comprising the n2s2 or n2p2 donor atom setIndexing code21
- B01J 2531/0247Tripodal ligandsIndexing code20
Recent patents
- Oxidized polyethylene compounds and methods of making the same18 Aug 2026US 12,709,680 B2The Regents of the University of California
- Porphyrin-based metal coordination conjugated polymer, preparation method therefor, and application thereof in photocatalytic degradation of organic pollutants26 May 2026US 12,636,642 B2Soochow University
- Metal organic framework and use thereof for generating H25 May 2026US 12,616,966 B2Centre National De La Recherche Scientifique
- Formate production method, formic acid production method, and antifreezing agent production method21 Apr 2026US 12,606,513 B2Nitto Denko Corporation
- Ammonia manufacturing apparatus and ammonia manufacturing method10 Feb 2026US 12,546,018 B2Kabushiki Kaisha Toshiba
- Selective olefin oligomerization with transition metal amine bis(phenolate) catalysts8 Oct 2026US 2026/0308083 A1Chevron Phillips Chemical Company LP
- Ammonia synthesis catalyst, ammonia production device, and ammonia production method6 Aug 2026US 2026/0225088 A1Idemitsu Kosan Co., Ltd.
- Method for producing nitrogenated compound6 Aug 2026US 2026/0226088 A1Idemitsu Kosan Co., Ltd.
- Catalyst system and method for carbonylation reaction23 Jul 2026US 2026/0208174 A1Shandong Nhu Fine Chemical Science and Technology Company Ltd.
- Carbon nanotube-porphyrin photocatalysts16 Jul 2026US 2026/0199888 A1
Most cited
By later US patents
- Functional, photochemically active, and chemically asymmetric membranes by interfacial polymerization of derivatized multifunctional prepolymers410US 4,784,736 ABend Research, Inc. · 1988
- Functional, photochemically active, and chemically asymmetric membranes by interfacial polymerization of derivatized multifunctional prepolymers370US 4,917,800 ABend Research, Inc. · 1990
- Method of expanded porphyrin-oligonucleotide conjugate synthesis325US 5,565,552 ABoard of Regents, Univ. of Texas Sys. · 1996
- Texaphyrin-oligonucleotide conjugates308US 5,587,371 ABoard of Trustees, Univ. of TX Sys. · 1996
- Chromophore probe for detection of nucleic acid221US 5,595,726 ABoard of Trustees, Univ. of TX Sys. · 1997