C01B 17/90
Separation
Official title: Separation; Purification
C01B17/90 (Separation) appears on 171 US grants and 85 published applications in this corpus.
Search patents in C01B- Granted patents
- 171
- Published applications
- 85
- Assignees
- 131
- Inventors
- 440
- Latest grant
- 5 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 5 | 0 |
| 1978 | 3 | 0 |
| 1979 | 7 | 0 |
| 1980 | 2 | 0 |
| 1981 | 3 | 0 |
| 1982 | 2 | 0 |
| 1983 | 3 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 3 | 0 |
| 1989 | 1 | 0 |
| 1990 | 7 | 0 |
| 1991 | 10 | 0 |
| 1992 | 7 | 0 |
| 1993 | 1 | 0 |
| 1994 | 7 | 0 |
| 1995 | 3 | 0 |
| 1996 | 8 | 0 |
| 1997 | 3 | 0 |
| 1998 | 2 | 0 |
| 1999 | 4 | 0 |
| 2000 | 4 | 0 |
| 2001 | 5 | 1 |
| 2002 | 4 | 2 |
| 2003 | 3 | 2 |
| 2004 | 3 | 5 |
| 2005 | 1 | 2 |
| 2006 | 1 | 3 |
| 2007 | 3 | 8 |
| 2008 | 4 | 4 |
| 2009 | 3 | 1 |
| 2010 | 3 | 5 |
| 2011 | 4 | 2 |
| 2012 | 1 | 5 |
| 2013 | 3 | 3 |
| 2014 | 3 | 5 |
| 2015 | 6 | 2 |
| 2016 | 4 | 4 |
| 2017 | 1 | 1 |
| 2018 | 3 | 3 |
| 2019 | 4 | 4 |
| 2020 | 4 | 4 |
| 2021 | 4 | 2 |
| 2022 | 0 | 4 |
| 2023 | 0 | 5 |
| 2024 | 0 | 3 |
| 2025 | 3 | 2 |
| 2026 | 3 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method of removing hydrogen peroxide from sulfuric acid5 May 2026US 12,617,681 B2Jingbao Chemical Co., Ltd.
- 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.
- Methanol and sulfuric acid co-production system16 Dec 2025US 12,496,533 B2Korea Institute of Science and Technology
- Method of cleaning an apparatus used in the concentration of a mineral acid14 Oct 2025US 12,441,614 B2Covestro Deutschland AG
- Process for removing sulfur containing compounds from gas containing at least one sulfur containing compound10 Sep 2026US 2026/0264009 A1Sulzer Management AG
- Process system for surface treatment, recycling equipment for waste liquid and method for recycling waste liquid2 Jul 2026US 2026/0183715 A1Industrial Technology Research Institute
- Method for recycling sulfuric acid15 Jan 2026US 2026/0015264 A1Industrial Technology Research Institute
- Recycling system and method for waste sulfuric acid solution containing hydrogen peroxide27 Mar 2025US 2025/0100881 A1Mega Union Technology Inc.
- Sulfuric acid recovery device and method for recovering sulfuric acid27 Feb 2025US 2025/0066196 A1Kioxia Corporation
Most cited
By later US patents
- Membrane solvent extraction82US 3,956,112 AAllied Chemical Corporation · 1976
- Removal of undesired gaseous components from hot waste gases49US 4,294,590 ALinde Aktiengesellschaft · 1981
- Sulfuric acid reprocessor48US 5,032,218 AAlameda Instruments, Inc. · 1991
- Removal of undesired gaseous components from hot waste gases46US 4,378,977 ALinde Aktiengesellschaft · 1983
- Method of separation of sugars and concentrated sulfuric acid39US 4,608,245 A1986