B01J 31/0239
Quaternary ammonium compounds
Official title: {Quaternary ammonium compounds}
B01J31/0239 (Quaternary ammonium compounds) appears on 461 US grants and 344 published applications in this corpus.
Search patents in B01J- Granted patents
- 461
- Published applications
- 344
- Assignees
- 277
- Inventors
- 1,114
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 8 | 0 |
| 1978 | 9 | 0 |
| 1979 | 8 | 0 |
| 1980 | 9 | 0 |
| 1981 | 15 | 0 |
| 1982 | 10 | 0 |
| 1983 | 7 | 0 |
| 1984 | 7 | 0 |
| 1985 | 12 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 5 | 0 |
| 1989 | 7 | 0 |
| 1990 | 3 | 0 |
| 1991 | 4 | 0 |
| 1992 | 11 | 0 |
| 1993 | 9 | 0 |
| 1994 | 6 | 0 |
| 1995 | 5 | 0 |
| 1996 | 4 | 0 |
| 1997 | 5 | 0 |
| 1998 | 11 | 0 |
| 1999 | 7 | 0 |
| 2000 | 12 | 0 |
| 2001 | 15 | 4 |
| 2002 | 12 | 6 |
| 2003 | 10 | 17 |
| 2004 | 15 | 12 |
| 2005 | 5 | 10 |
| 2006 | 5 | 7 |
| 2007 | 4 | 21 |
| 2008 | 3 | 9 |
| 2009 | 5 | 9 |
| 2010 | 13 | 20 |
| 2011 | 11 | 12 |
| 2012 | 4 | 11 |
| 2013 | 11 | 24 |
| 2014 | 14 | 15 |
| 2015 | 16 | 12 |
| 2016 | 21 | 19 |
| 2017 | 13 | 11 |
| 2018 | 11 | 14 |
| 2019 | 11 | 19 |
| 2020 | 18 | 10 |
| 2021 | 9 | 23 |
| 2022 | 15 | 19 |
| 2023 | 12 | 13 |
| 2024 | 11 | 13 |
| 2025 | 7 | 7 |
| 2026 | 9 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Intermediates for making derivatives of substituted morpholines18 Aug 2026US 12,709,602 B2Supernus Pharmaceuticals, Inc.
- Polyalkyl p-phenylenediamine anti-degradants and intermediates and preparation method thereof28 Jul 2026US 12,692,220 B2Sennics Co., Ltd.
- Oxirane-functional vinyl monomers and methods for making the same2 Jun 2026US 12,644,007 B2Swimc LLC
- Spirocyclic compound containing catalyst for use in catalyzing reaction of epoxide compound and carbon dioxide5 May 2026US 12,616,964 B2Shenzhen Capchem Technology Co., Ltd.
- Method for the preparation of 1,2-propanediol28 Apr 2026US 12,612,346 B2Evonik Operations GmbH
- Bifunctional acidic catalysts and preperation methods of furfural via catalyzing hemicellulose or xylose8 Oct 2026US 2026/0307066 A1Nanjing University
- Spirocyclic compound containing catalyst for use in catalyzing reaction of epoxide compound and carbon dioxide6 Aug 2026US 2026/0225086 A1Shenzhen Capchem Technology Co., Ltd.
- Thermal decomposition of ammonium perchlorate using magnetic nanoparticles functionalized with amine derivatives as catalysts11 Jun 2026US 2026/0158482 A1Universidad Bernardo O'Higgins
- Method for the preparation of 1,2-propanediol4 Jun 2026US 2026/0152455 A1Evonik Operations GmbH
- Ethylene sensor4 Jun 2026US 2026/0153492 A1Massachusetts Institute of Technology
Most cited
By later US patents
- Crystalline silicates and method of preparing the same142US 3,941,871 AMobil Oil Corporation · 1976
- Crystalline silicates and method for preparing same67US 4,104,294 AUnion Carbide Corporation · 1978
- Perfluorinated amide salts and their uses as ionic conducting materials61US 6,319,428 B1Centre National De La Recherche Scientifique · 2001
- Heterogeneous catalyst for the production of ethylidene diacetate from acetic anhydride58US 5,767,307 AAir Products and Chemicals, Inc. · 1998
- Non-aqueous liquid composition with an ionic character and its use as a solvent55US 5,104,840 AInstitut Francais du Petrole · 1992