C07C 231/22
Separation
Official title: Separation; Purification; Stabilisation; Use of additives (separation of optical isomers C07C231/20)
C07C231/22 (Separation) appears on 306 US grants and 344 published applications in this corpus.
Search patents in C07C- Granted patents
- 306
- Published applications
- 344
- Assignees
- 244
- Inventors
- 1,063
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 3 | 0 |
| 1991 | 3 | 0 |
| 1992 | 4 | 0 |
| 1993 | 6 | 0 |
| 1994 | 9 | 0 |
| 1995 | 5 | 0 |
| 1996 | 8 | 0 |
| 1997 | 4 | 0 |
| 1998 | 6 | 0 |
| 1999 | 7 | 0 |
| 2000 | 7 | 0 |
| 2001 | 4 | 1 |
| 2002 | 8 | 5 |
| 2003 | 7 | 13 |
| 2004 | 5 | 11 |
| 2005 | 5 | 9 |
| 2006 | 7 | 6 |
| 2007 | 6 | 13 |
| 2008 | 5 | 14 |
| 2009 | 8 | 14 |
| 2010 | 9 | 16 |
| 2011 | 9 | 22 |
| 2012 | 11 | 16 |
| 2013 | 14 | 13 |
| 2014 | 12 | 24 |
| 2015 | 14 | 13 |
| 2016 | 19 | 13 |
| 2017 | 7 | 16 |
| 2018 | 12 | 12 |
| 2019 | 12 | 14 |
| 2020 | 15 | 11 |
| 2021 | 14 | 19 |
| 2022 | 7 | 15 |
| 2023 | 4 | 12 |
| 2024 | 6 | 12 |
| 2025 | 9 | 17 |
| 2026 | 7 | 13 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Continuous crystallisation method25 Aug 2026US 12,715,838 B2Ge Healthcare Limited
- Crystalline solids of 3-palmitoyl-amido-1,2-propanediol and 3-palmitoyl-amido-2-hydroxy-1-dimethoxytriphenylmethylether-propane and methods of making and using the same4 Aug 2026US 12,698,254 B2Geron Corporation
- Additive compound for warm mix asphalt and process of synthesis thereof16 Jun 2026US 12,655,269 B2Hindustan Petroleum Corporation Limited
- Solvent drying solution and processes therfor17 Mar 2026US 12,577,185 B2Aquafortus Technologies Limited
- Amidated fatty acids and derivatives thereof17 Feb 2026US 12,552,740 B2Kao Chemicals GmbH
- Synthesis of n-lactoyl-phenylalanine (lac-phe) by condensation of a phenylalanine ester and a lactic acid ester8 Oct 2026US 2026/0308112 A1Kemin Industries, Inc.
- Crystalline forms of evenamide8 Oct 2026US 2026/0308115 A1Newron Pharmaceuticals S.p.A.
- Camelid-Derived Bioactive Compounds: Compositions, Methods, and Therapeutic Analgesic Applications17 Sep 2026US 2026/0272992 A1Applied Bio Research Inc.
- Method for producing tryptophan decomposition product, method for producing formylkynurenine, method for producing kynurenine, method for producing tryptophan radical-containing aqueous solution, and bactericidal aqueous solution6 Aug 2026US 2026/0223845 A1Meijo University
- Method for purification of amino acid surfactants6 Aug 2026US 2026/0225995 A1BASF SE
Most cited
By later US patents
- Methods for producing nateglinide B-type crystals54US 7,544,834 B2Ajinomoto Co., Inc. · 2009
- Formoterol tartrate process and polymorph53US 6,472,563 B1Sepracor Inc. · 2002
- Phenolic antioxidants in crystalline form30US 7,262,319 B2Ciba Specialty Chemicals Corporation · 2007
- Crystals of N- (trans-4-isopropylcyclohexlycarbonyl)-D-phenylalanine and methods for preparing them27US 5,463,116 AAjinomoto Co., Inc. · 1995
- Formoterol tartrate polymorph22US 6,720,453 B2Sepracor Inc. · 2004