C01D 5/008
Preparation of potassium sulfate from alunite
Official title: {Preparation of potassium sulfate from alunite}
C01D5/008 (Preparation of potassium sulfate from alunite) appears on 9 US grants and 2 published applications in this corpus.
Search patents in C01D- Granted patents
- 9
- Published applications
- 2
- Assignees
- 6
- Inventors
- 24
- Latest grant
- 12 Sep 2023
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 1 |
| 2022 | 0 | 0 |
| 2023 | 1 | 0 |
| 2024 | 0 | 0 |
| 2025 | 0 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Method of processing and treatment of alunite ores12 Sep 2023US 11,753,697 B2
- Recovery of alumina values from alunite ore21 Oct 1986US 4,618,480 AResource Technology Associates
- Method of producing pure alumina from alunite25 May 1982US 4,331,636 AFinancial Mining - Industrial and Shipping Corporation
- Process for reduction of alunite ore in aluminum recovery process6 Jun 1978US 4,093,700 AEarth Sciences, Inc.
- Process for recovering aluminum from alunite ore20 Dec 1977US 4,064,217 A
Most cited
By later US patents
- Method of producing alumina and potassium sulphate form alunite10US 3,983,211 A1976
- Method of producing pure alumina from alunite6US 4,331,636 AFinancial Mining - Industrial and Shipping Corporation · 1982
- Process for recovering aluminum from alunite5US 3,996,334 AEarth Sciences, Inc. · 1976
- Recovery of alumina values from alunite ore3US 4,618,480 AResource Technology Associates · 1986
- Recovery of aluminum from alunite ore using acid leach to purify the residue for bayer leach2US 4,031,182 AEarth Sciences, Inc. · 1977