C01B 25/231
Dihydrate-hemihydrate process
C01B25/231 (Dihydrate-hemihydrate process) appears on 7 US grants and 6 published applications in this corpus.
Search patents in C01B- Granted patents
- 7
- Published applications
- 6
- Assignees
- 6
- Inventors
- 20
- Latest grant
- 30 Jun 2020
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 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 | 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 | 1 |
| 2015 | 0 | 1 |
| 2016 | 2 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 1 |
| 2019 | 0 | 1 |
| 2020 | 2 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- 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 producing phosphoric acid9 Feb 2016US 9,255,006 B2Prayon Technologies
- Method of preparing wet process phosphoric acid6 Feb 2007US 7,172,742 B2Shandong Lubei Enterprise Group Company
- 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.
- Process for the production of phosphoric acid25 Jun 2015US 2015/0175424 A1
- Dihydrate-hemihydrate process for producing phosphoric acid1 May 2014US 2014/0120020 A1Prayon Technologies
- Method for producing phosphoric acid3 Jan 2013US 2013/0004403 A1Prayon Technologies
Most cited
By later US patents
- Continuous process for preparing phosphoric acid and calcium sulphate11US 4,777,027 APrayon Developpment, Societe Anonyme · 1988
- Method of preparing wet process phosphoric acid4US 7,172,742 B2Shandong Lubei Enterprise Group Company · 2007
- Method of recovering uranium from wet process phosphoric acid with enhanced content of uranium2US 4,427,641 ACentral Glass Company, Limited · 1984
- Dihydrate-hemihydrate process for producing phosphoric acid2US 9,371,230 B2Prayton Technologies · 2016
- Method for producing calcium sulfate1US 10,662,072 B2Prayon Technologies · 2020