C22B 3/36
Heterocyclic compounds
Official title: Heterocyclic compounds (C22B3/34 takes precedence)
C22B3/36 (Heterocyclic compounds) appears on 125 US grants and 42 published applications in this corpus.
Search patents in C22B- Granted patents
- 125
- Published applications
- 42
- Assignees
- 86
- Inventors
- 261
- Latest grant
- 23 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 9 | 0 |
| 1977 | 13 | 0 |
| 1978 | 10 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 5 | 0 |
| 1982 | 2 | 0 |
| 1983 | 3 | 0 |
| 1984 | 1 | 0 |
| 1985 | 4 | 0 |
| 1986 | 6 | 0 |
| 1987 | 6 | 0 |
| 1988 | 5 | 0 |
| 1989 | 7 | 0 |
| 1990 | 3 | 0 |
| 1991 | 4 | 0 |
| 1992 | 0 | 0 |
| 1993 | 8 | 0 |
| 1994 | 8 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 1 | 2 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 1 | 7 |
| 2013 | 5 | 3 |
| 2014 | 1 | 2 |
| 2015 | 3 | 0 |
| 2016 | 1 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 2 |
| 2019 | 0 | 1 |
| 2020 | 0 | 1 |
| 2021 | 0 | 1 |
| 2022 | 4 | 6 |
| 2023 | 2 | 4 |
| 2024 | 1 | 2 |
| 2025 | 1 | 3 |
| 2026 | 2 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method for separation of adjacent lanthanide elements23 Jun 2026US 12,662,714 B2UT-Battelle, LLC
- Separation of rare earth elements24 Mar 2026US 12,584,193 B2SHINE Technologies, LLC
- Pad surface regeneration and metal recovery11 Nov 2025US 12,466,025 B2Chempower Corporation
- Compounds for the selective solid-liquid extraction and liquid-liquid extraction of lithium chloride3 Sep 2024US 12,077,520 B2Board of Regents, The University of Texas System
- Methods for simultaneous leaching and extraction of precious metals14 Nov 2023US 11,814,698 B2Excir Works Corp.
- Methods for carbon capture and metal recovery and related systems24 Sep 2026US 2026/0284595 A1Battelle Energy Alliance, LLC
- Battery recycling materials3 Sep 2026US 2026/0258523 A1Uchicago Argonne, LLC
- Separation of rare earth elements25 Jun 2026US 2026/0176719 A1SHINE Technologies, LLC
- Extractant compounds and their use for the separation of rare earth elements11 Jun 2026US 2026/0159509 A1
- Use of lipophilic derivatives of aminopolycarboxylic acids for the extraction of rare earths from an acidic aqueous solution14 May 2026US 2026/0132482 A1Centre National De La Recherche Scientifique
Most cited
By later US patents
- Method for separating metal constituents from ocean floor nodules46US 4,042,664 ADeepsea Ventures, Inc. · 1977
- Microencapsulated chelating agents and their use in removing metal ions from aqueous solutions43US 4,500,494 AStauffer Chemical Company · 1985
- Method of recovering metal from metalliferous waste37US 3,966,569 AMX Processor Reinhardt & Co. AB · 1976
- Macrocyclic oxamides36US 5,298,618 ATexaco Chemical Company · 1994
- Process for liquid/liquid extraction of gallium31US 3,971,843 ARhone-Poulenc Industries · 1976