C01B 17/88
Concentration of sulfuric acid
C01B17/88 (Concentration of sulfuric acid) appears on 60 US grants and 33 published applications in this corpus.
Search patents in C01B- Granted patents
- 60
- Published applications
- 33
- Assignees
- 48
- Inventors
- 150
- Latest grant
- 26 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 4 | 0 |
| 1978 | 0 | 0 |
| 1979 | 5 | 0 |
| 1980 | 1 | 0 |
| 1981 | 5 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 3 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 1 |
| 2002 | 1 | 2 |
| 2003 | 1 | 0 |
| 2004 | 1 | 2 |
| 2005 | 2 | 1 |
| 2006 | 0 | 1 |
| 2007 | 0 | 1 |
| 2008 | 2 | 2 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 1 | 1 |
| 2012 | 0 | 1 |
| 2013 | 1 | 1 |
| 2014 | 0 | 2 |
| 2015 | 1 | 0 |
| 2016 | 0 | 0 |
| 2017 | 1 | 1 |
| 2018 | 1 | 1 |
| 2019 | 1 | 2 |
| 2020 | 1 | 2 |
| 2021 | 2 | 0 |
| 2022 | 0 | 6 |
| 2023 | 1 | 5 |
| 2024 | 1 | 0 |
| 2025 | 2 | 1 |
| 2026 | 4 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Integrated sulfur recovery and hydrogen production process26 May 2026US 12,637,353 B2
- Process to convert reduced sulfur species and water into hydrogen and sulfuric acid28 Apr 2026US 12,612,701 B2California Institute of Technology
- Process for the removal of particulate matter from an aqueous stream14 Apr 2026US 12,599,858 B2Topsoe A/S
- Concentration of sulfuric acid17 Mar 2026US 12,577,104 B2Dupont Safety & Construction, Inc.
- Method of cleaning an apparatus used in the concentration of a mineral acid14 Oct 2025US 12,441,614 B2Covestro Deutschland AG
- Recycling system and method for waste sulfuric acid solution containing hydrogen peroxide27 Mar 2025US 2025/0100881 A1Mega Union Technology Inc.
- Process for concentrating diluted sulfuric acid21 Dec 2023US 2023/0406704 A1BASF SE
- Apparatus and method for concentrating corrosive liquids7 Dec 2023US 2023/0390667 A1
- Integrated sulfur recovery and hydrogen production process26 Oct 2023US 2023/0339753 A1
- Concentration of sulfuric acid20 Apr 2023US 2023/0117014 A1Dupont Safety & Construction, Inc.
Most cited
By later US patents
- Process for the production of nitrobenzene24US 4,772,757 ABayer Aktiengesellschaft · 1988
- Method for upgrading used sulfuric acids20US 6,332,949 B1Bayer Aktiengesellschaft · 2001
- Method for the concentration of spent acid20US 6,926,757 B2Outokumpu Oyj · 2005
- Process for concentrating sulfuric acid in an evaporator18US 4,409,064 AAir Products and Chemicals, Inc. · 1983
- Process for purification and concentration of sulfuric acid17US 5,275,701 AAir Products and Chemicals, Inc. · 1994