C01B 25/229
Hemihydrate-dihydrate process
C01B25/229 (Hemihydrate-dihydrate process) appears on 11 US grants and 3 published applications in this corpus.
Search patents in C01B- Granted patents
- 11
- Published applications
- 3
- Assignees
- 13
- Inventors
- 29
- Latest grant
- 11 Feb 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 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 | 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 | 1 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 1 |
| 2019 | 0 | 0 |
| 2020 | 1 | 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.
- Recovery of P.sub.2 O.sub.5 values from phosphoric acid hemihydrate crystals1 Aug 1989US 4,853,201 AOccidental Chemical Corporation
- Process for the removal of heavy metals from acid, phosphate-containing, aqueous media18 Apr 1989US 4,822,582 AStamicarbon B. V.
- Process for the production of highly concentrated phosphoric acid10 Jan 1989US 4,797,265 AMitsui Toatsu Chemicals, Inc.
- Method for removing heavy metals in the manufacture of phosphoric acid16 Nov 2023US 2023/0365409 A1Jesa Technologies LLC
- Method for producing phosphoric acid and by-producing alpha-hemihydrate gypsum by wet-process13 Sep 2018US 2018/0257938 A1Kingenta Ecological Engineering Group Co., Ltd.
- Production of phosphoric acid by a two-stage crystallization process11 Sep 2014US 2014/0255287 A1MOS Holdings Inc.
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