C01B 25/228
One form of calcium sulfate being formed and then converted to another
Official title: one form of calcium sulfate being formed and then converted to another form
C01B25/228 (One form of calcium sulfate being formed and then converted to another) appears on 20 US grants and 9 published applications in this corpus.
Search patents in C01B- Granted patents
- 20
- Published applications
- 9
- Assignees
- 16
- Inventors
- 40
- Latest grant
- 11 Feb 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 4 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 3 | 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 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 1 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 1 |
| 2014 | 0 | 2 |
| 2015 | 0 | 1 |
| 2016 | 2 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 2 |
| 2019 | 0 | 1 |
| 2020 | 3 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 1 |
| 2024 | 0 | 0 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Method for removing heavy metals in the manufacture of phosphoric acid11 Feb 2025US 12,221,343 B2Jesa Technologies LLC
- Method for producing phosphoric acid and by-producing alpha-hemihydrate gypsum by wet-process18 Aug 2020US 10,745,278 B2Kingenta Ecological Engineering Group Co., Ltd.
- Method for producing wet-process phosphoric acid and by-producing alpha-hemihydrate gypsum and high-purity and high-whiteness alpha-hemihydrate gypsum30 Jun 2020US 10,696,552 B2Kingenta Norsterra Chemical Co., Ltd.
- Method for producing calcium sulfate26 May 2020US 10,662,072 B2Prayon Technologies
- Dihydrate-hemihydrate process for producing phosphoric acid21 Jun 2016US 9,371,230 B2Prayton Technologies
- Method for removing heavy metals in the manufacture of phosphoric acid16 Nov 2023US 2023/0365409 A1Jesa Technologies LLC
- Method for producing calcium sulfate24 Oct 2019US 2019/0322540 A1Prayon Technologies
- Method for producing wet-process phosphoric acid and by-producing alpha-hemihydrate gypsum and high-purity and high-whiteness alpha-hemihydrate gypsum27 Sep 2018US 2018/0273384 A1Kingenta Norsterra Chemical Co., Ltd.
- Method for producing phosphoric acid and by-producing alpha-hemihydrate gypsum by wet-process13 Sep 2018US 2018/0257938 A1Kingenta Ecological Engineering Group Co., Ltd.
- Process for the production of phosphoric acid25 Jun 2015US 2015/0175424 A1
Most cited
By later US patents
- Continuous process for preparing phosphoric acid and calcium sulphate11US 4,777,027 APrayon Developpment, Societe Anonyme · 1988
- Process for the production of highly concentrated phosphoric acid11US 4,797,265 AMitsui Toatsu Chemicals, Inc. · 1989
- Phosphohemihydrate process for purification of gypsum10US 4,424,196 AUnited States Gypsum Company · 1984
- Method for the wet process manufacture of phosphoric acid9US 4,501,724 AGoers Associates Inc. · 1985
- Process for producing phosphoric acid8US 4,311,677 ASwiss Aluminium Ltd. · 1982