C01B 17/69
Sulfur trioxide
Official title: Sulfur trioxide; Sulfuric acid
C01B17/69 (Sulfur trioxide) appears on 635 US grants and 351 published applications in this corpus.
Search patents in C01B- Granted patents
- 635
- Published applications
- 351
- Assignees
- 366
- Inventors
- 1,319
- Latest grant
- 21 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 35 | 0 |
| 1977 | 24 | 0 |
| 1978 | 29 | 0 |
| 1979 | 24 | 0 |
| 1980 | 11 | 0 |
| 1981 | 19 | 0 |
| 1982 | 12 | 0 |
| 1983 | 9 | 0 |
| 1984 | 10 | 0 |
| 1985 | 14 | 0 |
| 1986 | 5 | 0 |
| 1987 | 14 | 0 |
| 1988 | 9 | 0 |
| 1989 | 6 | 0 |
| 1990 | 19 | 0 |
| 1991 | 19 | 0 |
| 1992 | 17 | 0 |
| 1993 | 10 | 0 |
| 1994 | 17 | 0 |
| 1995 | 8 | 0 |
| 1996 | 18 | 0 |
| 1997 | 15 | 0 |
| 1998 | 7 | 0 |
| 1999 | 6 | 0 |
| 2000 | 11 | 0 |
| 2001 | 12 | 3 |
| 2002 | 8 | 5 |
| 2003 | 11 | 10 |
| 2004 | 6 | 12 |
| 2005 | 6 | 10 |
| 2006 | 4 | 6 |
| 2007 | 5 | 11 |
| 2008 | 7 | 16 |
| 2009 | 8 | 9 |
| 2010 | 15 | 20 |
| 2011 | 16 | 9 |
| 2012 | 3 | 16 |
| 2013 | 10 | 15 |
| 2014 | 13 | 15 |
| 2015 | 13 | 7 |
| 2016 | 10 | 9 |
| 2017 | 6 | 14 |
| 2018 | 8 | 20 |
| 2019 | 15 | 19 |
| 2020 | 20 | 18 |
| 2021 | 15 | 12 |
| 2022 | 8 | 25 |
| 2023 | 13 | 19 |
| 2024 | 5 | 19 |
| 2025 | 16 | 19 |
| 2026 | 14 | 13 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Hydrogen sulfide conversion21 Jul 2026US 12,686,930 B2Saudi Arabian Oil Company
- Integrated sulfur recovery and hydrogen production process26 May 2026US 12,637,353 B2
- Method for manufacturing sulphuric acid19 May 2026US 12,630,424 B2Ocp SA
- Method of removing hydrogen peroxide from sulfuric acid5 May 2026US 12,617,681 B2Jingbao Chemical Co., Ltd.
- Integrated method for the commercial and industrial utilisation of calcium sulphate whilst obtaining rare earth elements from the production of phosphoric acid28 Apr 2026US 12,612,309 B2thyssenkrupp AG
- Simultaneous production method of lithium hydroxide and sulfuric acid1 Oct 2026US 2026/0296908 A1Posco Holdings Inc.
- Process for removing sulfur containing compounds from gas containing at least one sulfur containing compound10 Sep 2026US 2026/0264009 A1Sulzer Management AG
- Sorbent polymer composite for improved so2 removal20 Aug 2026US 2026/0241365 A1W. L. Gore & Associates, Inc.
- Process system for surface treatment, recycling equipment for waste liquid and method for recycling waste liquid2 Jul 2026US 2026/0183715 A1Industrial Technology Research Institute
- Methods and systems for producing sulfur-containing products11 Jun 2026US 2026/0159389 A1Applied Technology Limited Partnership
Most cited
By later US patents
- Nanotechnology for engineering the performance of substances140US 6,531,704 B2NanoProducts Corporation · 2003
- Method and device for transforming chemical compositions120US 6,214,195 B1Nanomaterials Research Corporation · 2001
- Zero emission gasification, power generation, carbon oxides management and metallurgical reduction processes, apparatus, systems, and integration thereof117US 7,674,443 B12010
- Method and apparatus for producing a product in a regenerator furnace from impure waste containing a non-gasifiable impurity110US 5,640,709 AMolten Metal Technology, Inc. · 1997
- Method and apparatus for producing a product in a regenerator furnace from impure waste containing a non-gasifiable impurity108US 5,640,706 AMolten Metal Technology, Inc. · 1997