C01B 17/901
Recovery from spent acids containing metallic ions
Official title: {Recovery from spent acids containing metallic ions, e.g. hydrolysis acids, pickling acids (obtaining sulfur dioxide as an intermediate in sulfur trioxide recovery from sulfates, e.g. iron sulfates C01B17/501, from spent acids C01B17/58)}
C01B17/901 (Recovery from spent acids containing metallic ions) appears on 59 US grants and 25 published applications in this corpus.
Search patents in C01B- Granted patents
- 59
- Published applications
- 25
- Assignees
- 49
- Inventors
- 136
- Latest grant
- 23 Jun 2020
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 3 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 0 | 0 |
| 1990 | 7 | 0 |
| 1991 | 8 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 3 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 3 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 3 |
| 2005 | 0 | 1 |
| 2006 | 0 | 1 |
| 2007 | 1 | 4 |
| 2008 | 2 | 3 |
| 2009 | 2 | 0 |
| 2010 | 1 | 1 |
| 2011 | 2 | 0 |
| 2012 | 0 | 4 |
| 2013 | 1 | 1 |
| 2014 | 2 | 2 |
| 2015 | 2 | 1 |
| 2016 | 1 | 0 |
| 2017 | 1 | 0 |
| 2018 | 1 | 1 |
| 2019 | 1 | 1 |
| 2020 | 1 | 0 |
| 2021 | 0 | 1 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 0 |
| 2025 | 0 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method for recovering and purifying waste sulfuric acid solution23 Jun 2020US 10,689,255 B2Xiangtan University
- System for manufacturing high purity sulfuric acid16 Jul 2019US 10,351,427 B2Asia Union Electronic Chemical Corporation
- Method for manufacturing high purity sulfuric acid27 Mar 2018US 9,926,198 B2Asia Union Electronic Chemical Corporation
- Method for separating arsenic and heavy metals in an acidic washing solution31 Jan 2017US 9,555,362 B2Eisenmann SE
- Methods for the manufacture of cellulose nanocrystals29 Mar 2016US 9,297,111 B1Domtar Paper Company, LLC
- Process system for surface treatment, recycling equipment for waste liquid and method for recycling waste liquid2 Jul 2026US 2026/0183715 A1Industrial Technology Research Institute
- Separation of a strong acid from its salts21 Oct 2021US 2021/0323821 A1
- Method for recovering and purifying waste sulfuric acid solution19 Dec 2019US 2019/0382266 A1Xiangtan University
- Method for manufacturing high purity sulfuric acid14 Jun 2018US 2018/0162731 A1Asia Union Electronic Chemical Corporation
- Method for purification of spent sulfuric acid from titanium dioxide rutile industry7 May 2015US 2015/0122744 A1The National Titanium Dioxide Co. Ltd. (Cristal)
Most cited
By later US patents
- Sulfuric acid reprocessor48US 5,032,218 AAlameda Instruments, Inc. · 1991
- Method for treating zinc-containing sulfate solution32US 5,084,180 ACominco Ltd. · 1992
- Method for purification of sulfuric acid solution27US 4,559,216 AUnitika Ltd. · 1985
- Distillation method and apparatus for reprocessing sulfuric acid22US 4,980,032 AAlameda Instruments, Inc. · 1990
- Method for reclaiming metal sulfate-containing waste sulfuric acid17US 6,337,061 B12002