C07C 303/06
By reaction with sulfuric acid or sulfur trioxide
Official title: by reaction with sulfuric acid or sulfur trioxide
C07C303/06 (By reaction with sulfuric acid or sulfur trioxide) appears on 201 US grants and 149 published applications in this corpus.
Search patents in C07C- Granted patents
- 201
- Published applications
- 149
- Assignees
- 112
- Inventors
- 488
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 8 | 0 |
| 1977 | 5 | 0 |
| 1978 | 5 | 0 |
| 1979 | 3 | 0 |
| 1980 | 8 | 0 |
| 1981 | 3 | 0 |
| 1982 | 3 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 3 | 0 |
| 1990 | 5 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 3 | 0 |
| 1995 | 4 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 0 | 0 |
| 1999 | 2 | 0 |
| 2000 | 3 | 0 |
| 2001 | 2 | 0 |
| 2002 | 8 | 4 |
| 2003 | 8 | 3 |
| 2004 | 3 | 3 |
| 2005 | 3 | 10 |
| 2006 | 6 | 8 |
| 2007 | 3 | 6 |
| 2008 | 3 | 4 |
| 2009 | 6 | 10 |
| 2010 | 2 | 7 |
| 2011 | 6 | 3 |
| 2012 | 7 | 3 |
| 2013 | 3 | 4 |
| 2014 | 4 | 4 |
| 2015 | 6 | 4 |
| 2016 | 4 | 5 |
| 2017 | 4 | 2 |
| 2018 | 2 | 6 |
| 2019 | 7 | 11 |
| 2020 | 9 | 11 |
| 2021 | 10 | 10 |
| 2022 | 6 | 14 |
| 2023 | 9 | 7 |
| 2024 | 4 | 4 |
| 2025 | 3 | 4 |
| 2026 | 5 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method for the preparation of diarylmethane dyes and triarylmethane dyes including isosulfan blue22 Sep 2026US 12,741,934 B2Nj Bio, Inc.
- Process for the production of alkanesulfonic acids25 Aug 2026US 12,715,841 B2BASF SE
- Process for synthesizing sulfonated triaryl methane compounds30 Jun 2026US 12,668,570 B2Provepharm Life Solutions
- Recovery of water-free methanesulfonic acid from the bottom stream of a distillation column26 May 2026US 12,637,419 B2BASF SE
- Process for synthesizing triarylmethane sulfone compounds7 Apr 2026US 12,595,228 B2Provepharm Life Solutions
- Composition of triarylmethane sulfone compounds1 Oct 2026US 2026/0297021 A1Provepharm Life Solutions
- Production of sustainable sulfonates through treatment of re-refined base oils13 Aug 2026US 2026/0234102 A1HollyFrontier LSP Brand Strategies LLC
- Polyisobutyl benzene sulfonate for lubricants and fuels27 Nov 2025US 2025/0361336 A1BASF SE
- Oligobutyl benzene sulfonate for lubricants and fuels10 Jul 2025US 2025/0223258 A1BASF SE
- High-purity 4-(2-bromoethyl)benzenesulfonic acid, high-purity styrenesulfonic acid compound derived therefrom, and polymer thereof, and methods for producing same20 Mar 2025US 2025/0092171 A1Tosoh Finechem Corporation
Most cited
By later US patents
- Process for the preparation of light-colored oleic acid sulfonates67US 5,294,726 AHenkel Kommanditgesellschaft auf Aktien · 1994
- Controlled reactant injection with permeable plates54US 6,749,817 B1Uop LLC · 2004
- Sulfonated estolides and other derivatives of fatty acids, methods of making them, and compositions and processes employing them53US 7,666,828 B2Stepan Company · 2010
- Process for sulfonating internal olefins42US 5,488,148 AVista Chemical Company · 1996
- Cleaning products comprising improved alkylarylsulfonate surfactants prepared via vinylidene olefins and processes for preparation thereof42US 6,566,319 B1The Procter & Gamble Company · 2003