C07C 303/32
Preparation of esters or amides of sulfuric acids: of salts of sulfonic
Official title: of salts of sulfonic acids
C07C303/32 (Preparation of esters or amides of sulfuric acids: of salts of sulfonic) appears on 442 US grants and 348 published applications in this corpus.
Search patents in C07C- Granted patents
- 442
- Published applications
- 348
- Assignees
- 230
- Inventors
- 1,058
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 5 | 0 |
| 1978 | 4 | 0 |
| 1979 | 6 | 0 |
| 1980 | 7 | 0 |
| 1981 | 2 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 3 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 2 | 0 |
| 1990 | 3 | 0 |
| 1991 | 4 | 0 |
| 1992 | 10 | 0 |
| 1993 | 6 | 0 |
| 1994 | 11 | 0 |
| 1995 | 13 | 0 |
| 1996 | 14 | 0 |
| 1997 | 15 | 0 |
| 1998 | 13 | 0 |
| 1999 | 8 | 0 |
| 2000 | 7 | 0 |
| 2001 | 9 | 3 |
| 2002 | 6 | 4 |
| 2003 | 7 | 5 |
| 2004 | 4 | 13 |
| 2005 | 8 | 11 |
| 2006 | 5 | 11 |
| 2007 | 5 | 6 |
| 2008 | 6 | 11 |
| 2009 | 6 | 11 |
| 2010 | 8 | 11 |
| 2011 | 9 | 22 |
| 2012 | 11 | 22 |
| 2013 | 8 | 20 |
| 2014 | 19 | 14 |
| 2015 | 28 | 17 |
| 2016 | 19 | 29 |
| 2017 | 23 | 16 |
| 2018 | 31 | 32 |
| 2019 | 10 | 13 |
| 2020 | 21 | 11 |
| 2021 | 13 | 14 |
| 2022 | 4 | 10 |
| 2023 | 13 | 19 |
| 2024 | 13 | 6 |
| 2025 | 6 | 11 |
| 2026 | 4 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Salt, acid generator, resist composition and method for producing resist pattern11 Aug 2026US 12,704,781 B2Sumitomo Chemical Company, Limited
- Photoacid generator, chemically amplified resist composition, and patterning process24 Mar 2026US 12,585,186 B2Shin-Etsu Chemical Co., Ltd.
- System and method for efficiently preparing taurine continuously3 Mar 2026US 12,565,472 B2Hubei Grand Life Science and Technology Co., Ltd.
- Process for the preparation of polyaminocarboxylic acids and chelate compounds thereof27 Jan 2026US 12,534,488 B2Valagro S.P.A.
- Photoacid generators, photoresist compositions, and pattern formation methods9 Dec 2025US 12,493,241 B2
- Process for the preparation of amino acid esters as organoether sulfate salts from alkoxylated alcohols10 Sep 2026US 2026/0265646 A1BASF SE
- Production of sustainable sulfonates through treatment of re-refined base oils13 Aug 2026US 2026/0234102 A1HollyFrontier LSP Brand Strategies LLC
- Composite emulsifier and oil-based drilling fluid13 Aug 2026US 2026/0234461 A1China Petroleum & Chemical Corporation
- Process for the preparation of polyaminocarboxylic acids and chelate compounds thereof7 May 2026US 2026/0125407 A1Valagro S.P.A.
- Salts and polymorphs of a tetracycline compound26 Feb 2026US 2026/0053824 A1Paratek Pharmaceuticals, Inc.
Most cited
By later US patents
- Process for the production of surfactant mixtures based on ether sulfonates and their use126US 5,318,709 AHenkel Kommanditgesellschaft auf Aktien · 1994
- Phase transfer catalysis of heterogeneous reactions by quaternary salts123US 3,992,432 AContinental Oil Company · 1976
- Crystalline forms of a purine derivative99US 8,889,861 B2Cyclacel Limited · 2014
- Mechanical force sensing semiconductor device69US 5,461,916 ANippondenso Co., Ltd. · 1995
- Process for the preparation of light-colored oleic acid sulfonates67US 5,294,726 AHenkel Kommanditgesellschaft auf Aktien · 1994