C01B 17/765
Multi-stage so3-conversion
Official title: Multi-stage SO3-conversion
C01B17/765 (Multi-stage so3-conversion) appears on 68 US grants and 45 published applications in this corpus.
Search patents in C01B- Granted patents
- 68
- Published applications
- 45
- Assignees
- 41
- Inventors
- 124
- Latest grant
- 20 Jan 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 4 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 3 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 3 | 0 |
| 1986 | 3 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 3 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 1 |
| 2008 | 1 | 2 |
| 2009 | 0 | 1 |
| 2010 | 4 | 2 |
| 2011 | 1 | 1 |
| 2012 | 1 | 2 |
| 2013 | 4 | 4 |
| 2014 | 2 | 5 |
| 2015 | 5 | 2 |
| 2016 | 2 | 0 |
| 2017 | 0 | 4 |
| 2018 | 3 | 4 |
| 2019 | 2 | 5 |
| 2020 | 8 | 3 |
| 2021 | 1 | 1 |
| 2022 | 1 | 2 |
| 2023 | 3 | 1 |
| 2024 | 0 | 1 |
| 2025 | 0 | 1 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Integrated ammonia and sulfuric acid production plant and process20 Jan 2026US 12,528,752 B2Chemetics Inc.
- Method for preparing electronic grade sulfuric acid from waste sulfuric acid solution1 Aug 2023US 11,713,247 B2Green Advanced Technology Ltd.
- Regeneration of acid containing peroxy acids of sulfur21 Feb 2023US 11,584,644 B2Veolia North America Regeneration Services, LLC
- Method for inter-bed cooling in wet gas sulfuric acid plants3 Jan 2023US 11,543,120 B2Haldor TopsøE A/S
- Regeneration of acid containing peroxy acids of sulfur31 May 2022US 11,345,594 B2Veolia North America Regeneration Services, LLC
- Methods and systems for producing sulfur-containing products11 Jun 2026US 2026/0159389 A1Applied Technology Limited Partnership
- Method and system for treating sulfur dioxide containing stream by catalytic oxidation and acid aqueous absorption12 Feb 2026US 2026/0042058 A1Saudi Arabian Oil Company
- Strong gas process and apparatus for sulfuric acid production5 Jun 2025US 2025/0178899 A1Noram Engineering and Constructors Ltd.
- Process and apparatus for preparing sulfur trioxide from sulfur dioxide24 Oct 2024US 2024/0351879 A1Messer Industries USA, Inc.
- Integrated ammonia and sulfuric acid production plant and process9 Feb 2023US 2023/0038918 A1Chemetics Inc.
Most cited
By later US patents
- Heat recovery from concentrated sulfuric acid26US 4,996,038 AMonsanto Company · 1991
- Heat recovery from concentrated sulfuric acid20US 4,576,813 AMonsanto Company · 1986
- Heat recovery from concentrated sulfuric acid17US 4,670,242 AMonsanto Company · 1987
- Method for recovering high grade process energy from a contact sulfuric acid process17US 5,130,112 AMonsanto Company · 1992
- Production of liquid sulfur trioxide14US 4,046,866 AStauffer Chemical Company · 1977