C01D 5/00
Sulfates or sulfites of sodium, potassium or alkali metals in general
Official title: Sulfates or sulfites of sodium, potassium or alkali metals in general {(sulfites in general C01B17/62)}
C01D5/00 (Sulfates or sulfites of sodium, potassium or alkali metals in general) appears on 322 US grants and 223 published applications in this corpus.
Search patents in C01D- Granted patents
- 322
- Published applications
- 223
- Assignees
- 276
- Inventors
- 776
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 12 | 0 |
| 1977 | 8 | 0 |
| 1978 | 10 | 0 |
| 1979 | 9 | 0 |
| 1980 | 7 | 0 |
| 1981 | 7 | 0 |
| 1982 | 6 | 0 |
| 1983 | 6 | 0 |
| 1984 | 6 | 0 |
| 1985 | 10 | 0 |
| 1986 | 4 | 0 |
| 1987 | 5 | 0 |
| 1988 | 2 | 0 |
| 1989 | 6 | 0 |
| 1990 | 3 | 0 |
| 1991 | 4 | 0 |
| 1992 | 3 | 0 |
| 1993 | 4 | 0 |
| 1994 | 5 | 0 |
| 1995 | 4 | 0 |
| 1996 | 8 | 0 |
| 1997 | 9 | 0 |
| 1998 | 6 | 0 |
| 1999 | 3 | 0 |
| 2000 | 5 | 0 |
| 2001 | 9 | 1 |
| 2002 | 8 | 4 |
| 2003 | 3 | 4 |
| 2004 | 4 | 2 |
| 2005 | 3 | 8 |
| 2006 | 6 | 7 |
| 2007 | 0 | 1 |
| 2008 | 1 | 8 |
| 2009 | 5 | 5 |
| 2010 | 4 | 10 |
| 2011 | 4 | 2 |
| 2012 | 6 | 2 |
| 2013 | 6 | 10 |
| 2014 | 7 | 10 |
| 2015 | 10 | 5 |
| 2016 | 7 | 11 |
| 2017 | 4 | 9 |
| 2018 | 11 | 15 |
| 2019 | 14 | 18 |
| 2020 | 9 | 12 |
| 2021 | 10 | 10 |
| 2022 | 6 | 13 |
| 2023 | 7 | 14 |
| 2024 | 11 | 16 |
| 2025 | 5 | 12 |
| 2026 | 10 | 14 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- C01D 5/16Purification51
- C01D 5/02Preparation of sulfates from alkali metal salts and sulfuric acid or bisulfates49
- C01D 5/14Preparation of sulfites41
- C01D 5/06Preparation of sulfates by double decomposition35
- C01D 5/12Preparation of double sulfates of magnesium with sodium or potassium14
- C01D 5/04Preparation of sulfates with the aid of sulfurous acid or sulfites10
- C01D 5/008Preparation of potassium sulfate from alunite9
- C01D 5/18Dehydration9
Recent patents
- Processes for producing alkali hydroxides or alkali sulfites using large molecular weight acid intermediates6 Oct 2026US 12,753,082 B2Innovator Energy, LLC
- Seawater desalination system and resourcezation system30 Jun 2026US 12,668,514 B2Zibo Gerui Water Treatment Engineering Co., Ltd.
- Crystallization of salts from high pressure reverse osmosis concentrate16 Jun 2026US 12,655,040 B2Saltworks Technologies Inc.
- Powderous lithium cobalt-based oxide cathode active material powder for rechargeable lithium ion batteries and a method for making thereof5 May 2026US 12,617,696 B2Umicore AG & Co. KG
- Electrolytic recycling system of waste phosphogypsum and method24 Mar 2026US 12,584,230 B2
- Method For Recovering Rare Earths And Coproducts From Phosphogypsum And Phosphoric Acid Sludge10 Sep 2026US 2026/0265867 A1Universite Mohammed VI Polytechnique
- A method for recovery of lithium13 Aug 2026US 2026/0233998 A1Northvolt Revolt AB
- A method for treating waste sodium sulphate obtained from an industrial process, use of waste sodium sulphate obtained from an industrial process and an industrial processing plant18 Jun 2026US 2026/0167509 A1Umicore Battery Materials Finland Oy
- A method for treating waste sodium sulphate obtained from an industrial process of battery industry, use of waste sodium sulphate obtained from an industrial process of battery industry and an industrial processing plant of battery industry18 Jun 2026US 2026/0167581 A1Umicore Battery Materials Finland Oy
- Processes for producing alkali hydroxides or alkali sulfites using large molecular weight acid intermediates4 Jun 2026US 2026/0152406 A1Innovator Energy, LLC
Most cited
By later US patents
- Photoelectrochemical device containing a quantum confined group IV semiconductor nanoparticle133US 6,361,660 B12002
- Apparatus and process for electrodialysis of salts67US 6,221,225 B1Archer Daniels Midland Company · 2001
- Alkali metal catalyst recovery system62US 4,057,512 AExxon Research & Engineering Co. · 1977
- Recovery of inorganic salt during processing of lignocellulosic feedstocks52US 7,585,652 B2Iogen Energy Corporation · 2009
- Process for the production of chlorine dioxide41US 5,227,031 AEka Nobel AB · 1993