C01F 11/46
Sulfates
Official title: Sulfates (dehydration of gypsum {for the production of calcium sulfate cements} C04B11/02)
C01F11/46 (Sulfates) appears on 524 US grants and 372 published applications in this corpus.
Search patents in C01F- Granted patents
- 524
- Published applications
- 372
- Assignees
- 379
- Inventors
- 1,313
- Latest grant
- 30 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 15 | 0 |
| 1977 | 14 | 0 |
| 1978 | 19 | 0 |
| 1979 | 8 | 0 |
| 1980 | 11 | 0 |
| 1981 | 11 | 0 |
| 1982 | 9 | 0 |
| 1983 | 11 | 0 |
| 1984 | 8 | 0 |
| 1985 | 12 | 0 |
| 1986 | 15 | 0 |
| 1987 | 5 | 0 |
| 1988 | 2 | 0 |
| 1989 | 12 | 0 |
| 1990 | 7 | 0 |
| 1991 | 7 | 0 |
| 1992 | 17 | 0 |
| 1993 | 14 | 0 |
| 1994 | 11 | 0 |
| 1995 | 5 | 0 |
| 1996 | 9 | 0 |
| 1997 | 11 | 0 |
| 1998 | 5 | 0 |
| 1999 | 6 | 0 |
| 2000 | 4 | 0 |
| 2001 | 15 | 5 |
| 2002 | 5 | 2 |
| 2003 | 5 | 11 |
| 2004 | 6 | 11 |
| 2005 | 6 | 3 |
| 2006 | 4 | 7 |
| 2007 | 7 | 6 |
| 2008 | 7 | 11 |
| 2009 | 6 | 12 |
| 2010 | 5 | 16 |
| 2011 | 8 | 14 |
| 2012 | 8 | 7 |
| 2013 | 8 | 8 |
| 2014 | 12 | 12 |
| 2015 | 8 | 18 |
| 2016 | 11 | 14 |
| 2017 | 9 | 26 |
| 2018 | 15 | 28 |
| 2019 | 24 | 22 |
| 2020 | 20 | 16 |
| 2021 | 10 | 22 |
| 2022 | 14 | 11 |
| 2023 | 14 | 27 |
| 2024 | 14 | 23 |
| 2025 | 22 | 23 |
| 2026 | 13 | 17 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Seawater desalination system and resourcezation system30 Jun 2026US 12,668,514 B2Zibo Gerui Water Treatment Engineering Co., Ltd.
- Method for recovering valuable substance9 Jun 2026US 12,649,960 B2Dowa Eco-System Co., Ltd.
- Recovery of commercial substances from apatite mineral5 May 2026US 12,617,691 B2Easymining Sweden AB
- Alkali hydroxide production from alkali sulfate with halogen or carboxylic acid intermediates5 May 2026US 12,618,162 B2Innovator Energy, LLC
- Integrated method for the commercial and industrial utilisation of calcium sulphate whilst obtaining rare earth elements from the production of phosphoric acid28 Apr 2026US 12,612,309 B2thyssenkrupp AG
- Method for comprehensive utilization of ulexite ore resources3 Sep 2026US 2026/0257927 A1Fujian Jungie New Material Technology Co., Ltd.
- Method of management of fly ashes from the combustion of petroleum products27 Aug 2026US 2026/0250488 A1RE-Solve Sp. z.o.o.
- Alkali hydroxide production from alkali sulfate with halogen or carboxylic acid intermediates13 Aug 2026US 2026/0234812 A1Innovator Energy, LLC
- Systems and methods for producing alkali hydroxides and sulfuric acid or hydrochloric acid11 Jun 2026US 2026/0159405 A1Innovator Energy, LLC
- Fluorination processes11 Jun 2026US 2026/0159463 A1Oxford University Innovation Limited
Most cited
By later US patents
- Plasma whirl reactor apparatus and methods of use164US 7,622,693 B2Foret Plasma Labs, LLC · 2009
- Multiple stream high pressure mixer/reactor106US 6,221,332 B1Microfluidics International Corporation · 2001
- Water desalination process and apparatus67US 7,459,088 B2University of South Carolina · 2008
- Method and means for exploiting fuel having high sulfur content66US 5,571,490 AOrmat, Inc. · 1996
- Process for the preparation of barium sulfate of increased flowability and density, suitable as a radio-opaque component in radiographic contrast agents, product obtained according to this process and the radiographic contrast agent produced therefrom52US 4,588,574 ABracco Industria Chimica S.p.A. · 1986