C01F 11/466
Conversion of one form of calcium sulfate to another
Official title: {Conversion of one form of calcium sulfate to another}
C01F11/466 (Conversion of one form of calcium sulfate to another) appears on 54 US grants and 36 published applications in this corpus.
Search patents in C01F- Granted patents
- 54
- Published applications
- 36
- Assignees
- 42
- Inventors
- 148
- Latest grant
- 9 Sep 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 3 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 5 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 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 | 1 | 2 |
| 2004 | 2 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 1 |
| 2009 | 2 | 2 |
| 2010 | 0 | 3 |
| 2011 | 1 | 3 |
| 2012 | 0 | 1 |
| 2013 | 2 | 0 |
| 2014 | 0 | 2 |
| 2015 | 0 | 2 |
| 2016 | 2 | 1 |
| 2017 | 1 | 2 |
| 2018 | 3 | 4 |
| 2019 | 2 | 5 |
| 2020 | 4 | 0 |
| 2021 | 1 | 1 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 3 |
| 2025 | 1 | 1 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Crystallization method of gypsum9 Sep 2025US 12,410,095 B2Tokuyama Corporation
- Calcined gypsum treatment device and calcined gypsum treatment method13 Apr 2021US 10,974,993 B2Yoshino Gypsum Co., Ltd.
- 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 calcium sulfate26 May 2020US 10,662,072 B2Prayon Technologies
- Method for producing calcium sulphate hemihydrate with unique properties7 Apr 2020US 10,611,646 B2Lidds AB
- Device for haremless treatment of phosphogypsum by calcination using high-temperature ceramsite29 Jan 2026US 2026/0029199 A1Hubei Juhai Environmental Technology Co., Ltd.
- Methods for calcining gypsum23 Oct 2025US 2025/0326654 A1Georgia-Pacific Gypsum LLC
- A method for processing wasted gypsum boards and a fluidized-bed calcining apparatus therefor20 Jun 2024US 2024/0198401 A1Tokuyama Corporation
- A crystallization method of gypsum20 Jun 2024US 2024/0199482 A1Tokuyama Corporation
- Method for preparing inorganic compound using desulfurization gypsum for reducing greenhouse gas emissions2 May 2024US 2024/0140815 A1Hyundai Oilbank Co., Ltd.
Most cited
By later US patents
- Process for manufacturing synthetic gypsum absorbent granules23US 4,264,543 AOil-Dri Corporation of America · 1981
- Process for manufacturing ultra low consistency alpha- and beta- blend stucco23US 7,588,634 B2United States Gypsum Company · 2009
- Process for preparing calcium sulfate alpha hemihydrate21US 5,093,093 APromineral Gesellschaft zur Verwendung von Mineralstoffen mbH · 1992
- Mica-free joint compound20US 4,286,995 ANational Gypsum Company · 1981
- Method for the preparation of fibrous insoluble calcium sulfate anhydrite19US 4,029,512 AJohns Manville · 1977