B01D 53/50
Sulfur oxides
Official title: Sulfur oxides (B01D53/60 takes precedence)
B01D53/50 (Sulfur oxides) appears on 2,212 US grants and 1,341 published applications in this corpus.
Search patents in B01D- Granted patents
- 2,212
- Published applications
- 1,341
- Assignees
- 988
- Inventors
- 3,793
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 60 | 0 |
| 1977 | 37 | 0 |
| 1978 | 46 | 0 |
| 1979 | 42 | 0 |
| 1980 | 58 | 0 |
| 1981 | 42 | 0 |
| 1982 | 40 | 0 |
| 1983 | 40 | 0 |
| 1984 | 34 | 0 |
| 1985 | 54 | 0 |
| 1986 | 56 | 0 |
| 1987 | 40 | 0 |
| 1988 | 37 | 0 |
| 1989 | 56 | 0 |
| 1990 | 41 | 0 |
| 1991 | 42 | 0 |
| 1992 | 37 | 0 |
| 1993 | 47 | 0 |
| 1994 | 41 | 0 |
| 1995 | 36 | 0 |
| 1996 | 45 | 0 |
| 1997 | 60 | 0 |
| 1998 | 37 | 0 |
| 1999 | 24 | 0 |
| 2000 | 35 | 0 |
| 2001 | 36 | 3 |
| 2002 | 23 | 25 |
| 2003 | 28 | 27 |
| 2004 | 21 | 42 |
| 2005 | 14 | 26 |
| 2006 | 15 | 33 |
| 2007 | 19 | 26 |
| 2008 | 18 | 44 |
| 2009 | 26 | 42 |
| 2010 | 36 | 53 |
| 2011 | 33 | 58 |
| 2012 | 39 | 63 |
| 2013 | 65 | 94 |
| 2014 | 78 | 84 |
| 2015 | 68 | 84 |
| 2016 | 64 | 93 |
| 2017 | 71 | 80 |
| 2018 | 82 | 86 |
| 2019 | 85 | 84 |
| 2020 | 87 | 80 |
| 2021 | 63 | 48 |
| 2022 | 57 | 47 |
| 2023 | 36 | 39 |
| 2024 | 19 | 30 |
| 2025 | 24 | 27 |
| 2026 | 18 | 23 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Flue gas purification system for hazardous waste incineration and purification method25 Aug 2026US 12,714,969 B2Chongqing Greening Environmental Protection Co. Ltd
- Apparatus for reducing greenhouse gas emission in vessel and vessel including the same14 Jul 2026US 12,678,736 B2Daewoo Shipbuilding & Marine Engineering Co., Ltd.
- Method of elimination of poly- and perfluoroalkyl substances (PFAS) in a wastewater biosolids gasification process using a thermal oxidizer and hydrated lime injection9 Jun 2026US 12,649,885 B2Aries Clean Technologies LLC
- Thermo-chemical transformation of wet food waste with plastics, biodegradable packaging, and fluorinated compounds in a multi-annular concentric feed rotary kiln system2 Jun 2026US 12,644,061 B1Simple Approach Systems, Inc.
- Scrubber for washing exhaust fumes generated by internal combustion engines26 May 2026US 12,636,609 B2Ecospray Technologies S.r.l.
- Removal of atmospheric pollutants from gas, related apparatus, processes and uses thereof24 Sep 2026US 2026/0284589 A1Intelligent Abatement, LLC
- Exhaust gas treatment apparatus10 Sep 2026US 2026/0263994 A1Nanomist Technologies Co., Ltd.
- Process for removing sulfur containing compounds from gas containing at least one sulfur containing compound10 Sep 2026US 2026/0264009 A1Sulzer Management AG
- Exhaust gas purification method and exhaust gas purification apparatus20 Aug 2026US 2026/0241339 A1Mitsubishi Heavy Industries, Ltd.
- Cooling tower, carbon dioxide capture device, and method for treating surface of packing20 Aug 2026US 2026/0241340 A1Mitsubishi Heavy Industries, Ltd.
Most cited
By later US patents
- Removal of sulfur dioxide from process gas using treated oil shale and water278US 4,093,026 AOccidental Oil Shale, Inc. · 1978
- Two-stage removal of sulfur dioxide from process gas using treated oil shale208US 4,140,181 AOccidental Oil Shale, Inc. · 1979
- System and method for sequestration and separation of mercury in combustion exhaust gas aqueous scrubber systems182US 7,722,843 B12010
- Methods for removing air pollutants from combustion flue gas143US 5,670,122 AEnergy and Environmental Research Corporation · 1997
- Flue gas control system of coal combustion boiler and operating method thereof122US 8,071,060 B2Mitsubishi Heavy Industries, Ltd. · 2011