C07C 303/00
Preparation of esters or amides of sulfuric acids
Official title: Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides
C07C303/00 (Preparation of esters or amides of sulfuric acids) appears on 1,997 US grants and 1,662 published applications in this corpus.
Search patents in C07C- Granted patents
- 1,997
- Published applications
- 1,662
- Assignees
- 933
- Inventors
- 5,093
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 29 | 0 |
| 1977 | 19 | 0 |
| 1978 | 22 | 0 |
| 1979 | 23 | 0 |
| 1980 | 25 | 0 |
| 1981 | 17 | 0 |
| 1982 | 19 | 0 |
| 1983 | 10 | 0 |
| 1984 | 15 | 0 |
| 1985 | 10 | 0 |
| 1986 | 11 | 0 |
| 1987 | 18 | 0 |
| 1988 | 17 | 0 |
| 1989 | 22 | 0 |
| 1990 | 26 | 0 |
| 1991 | 24 | 0 |
| 1992 | 37 | 0 |
| 1993 | 34 | 0 |
| 1994 | 38 | 0 |
| 1995 | 39 | 0 |
| 1996 | 40 | 0 |
| 1997 | 42 | 0 |
| 1998 | 32 | 0 |
| 1999 | 43 | 0 |
| 2000 | 59 | 0 |
| 2001 | 48 | 17 |
| 2002 | 61 | 38 |
| 2003 | 48 | 62 |
| 2004 | 35 | 55 |
| 2005 | 42 | 77 |
| 2006 | 34 | 52 |
| 2007 | 37 | 44 |
| 2008 | 37 | 53 |
| 2009 | 41 | 64 |
| 2010 | 32 | 67 |
| 2011 | 31 | 71 |
| 2012 | 47 | 60 |
| 2013 | 41 | 84 |
| 2014 | 63 | 65 |
| 2015 | 100 | 78 |
| 2016 | 75 | 103 |
| 2017 | 73 | 70 |
| 2018 | 83 | 96 |
| 2019 | 74 | 85 |
| 2020 | 76 | 70 |
| 2021 | 49 | 75 |
| 2022 | 50 | 67 |
| 2023 | 46 | 67 |
| 2024 | 46 | 46 |
| 2025 | 37 | 52 |
| 2026 | 20 | 44 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- C07C 303/02Preparation of esters or amides of sulfuric acids: of sulfonic acids or764
- C07C 303/32Preparation of esters or amides of sulfuric acids: of salts of sulfonic442
- C07C 303/36Preparation of esters or amides of sulfuric acids: of amides of sulfonic357
- C07C 303/42Separation336
- C07C 303/26Preparation of esters or amides of sulfuric acids: of esters of sulfonic279
- C07C 303/24Preparation of esters or amides of sulfuric acids: of esters of sulfuric164
- C07C 303/34Preparation of esters or amides of sulfuric acids: of amides of sulfuric34
Recent patents
- Amorphous substances, crystals, pharmaceutical compositions, preparation methods and uses of thiohydantoin compound or pharmaceutically acceptable salt thereof6 Oct 2026US 12,753,173 B2Suzhou Kintor Pharmaceuticals, Inc.
- Method for the preparation of diarylmethane dyes and triarylmethane dyes including isosulfan blue22 Sep 2026US 12,741,934 B2Nj Bio, Inc.
- Tautomeric ligand enables biomimetic C—H hydroxylation with molecular oxygen22 Sep 2026US 12,741,937 B2The Scripps Research Institute
- Process for the production of alkanesulfonic acids25 Aug 2026US 12,715,841 B2BASF SE
- Salt, acid generator, resist composition and method for producing resist pattern11 Aug 2026US 12,704,781 B2Sumitomo Chemical Company, Limited
- Composition of triarylmethane sulfone compounds1 Oct 2026US 2026/0297021 A1Provepharm Life Solutions
- Process for the preparation of sulfamoylbenzoic acid derivatives1 Oct 2026US 2026/0297022 A1Iama Therapeutics S.R.L.
- Emulsifier and preparation method therefor, and oil-based drilling fluid1 Oct 2026US 2026/0297414 A1China Petroleum & Chemical Corporation
- Process for the preparation of sulfamide derivatives17 Sep 2026US 2026/0274789 A1Adama Agan Ltd.
- Ammonium styrenesulfonate composition excellent in storage stability, and method for producing same17 Sep 2026US 2026/0274790 A1Sagami Chemical Research Institute
Most cited
By later US patents
- Mid-chain branched surfactants193US 6,020,303 AThe Procter & Gamble Company · 2000
- Mid-chain branched alkyl sulfate surfactants175US 6,060,443 AThe Procter & Gamble Company · 2000
- Detergent compositions containing selected mid-chain branched surfactants167US 6,326,348 B1The Procter & Gamble Company · 2001
- Mid-Chain branched Alkoxylated Sulfate Surfactants147US 6,008,181 AThe Procter & Gamble Company · 1999
- Process for the production of surfactant mixtures based on ether sulfonates and their use126US 5,318,709 AHenkel Kommanditgesellschaft auf Aktien · 1994