C04B 11/05
Obtaining anhydrite
Official title: obtaining anhydrite, {e.g. Keene's cement}(C04B11/028 takes precedence)
C04B11/05 (Obtaining anhydrite) appears on 13 US grants and 4 published applications in this corpus.
Search patents in C04B- Granted patents
- 13
- Published applications
- 4
- Assignees
- 11
- Inventors
- 35
- Latest grant
- 4 Apr 2017
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
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| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 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 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 1 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 1 |
| 2017 | 1 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 1 |
| 2025 | 0 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Lower heat processed calcium sulphates for early strength cements and general use4 Apr 2017US 9,611,172 B2
- Method for producing an anhydrite III or α based hydraulic bonding agent16 Mar 2004US 6,706,113 B1Societe Europeenne d′Exploitation de Technologies Industrielles
- Processing equipment and method for a pulverulent calcium sulphate material and novel hydraulic binder16 Jan 2001US 6,174,362 B1
- Process for preparing calcium sulfate anhydrite8 Dec 1992US 5,169,444 AGebruder Knauf Westdeutsche Gipswerke KG
- Method of treating produced gypsum8 Dec 1992US 5,169,617 ARuedersdorfer Zement GmbH
- Process for recovering plaster waste and installation for carrying out such a process9 Jul 2026US 2026/0193132 A1Holding Ritleng
- Method for preparing inorganic compound using desulfurization gypsum for reducing greenhouse gas emissions2 May 2024US 2024/0140815 A1Hyundai Oilbank Co., Ltd.
- Lower heat processed calcium sulphates for early strength cements and general use7 Jan 2016US 2016/0002106 A1
- Method for stabilising soluble metastable soluble anhydrite iii, method for preparing stabilised soluble anhydrite iii hydraulic binder, the obtained hydraulic binder, use of this binder and industrial facility for carrying out such a method3 Dec 2009US 2009/0293772 A1
Most cited
By later US patents
- Anhydrite cellular concrete and composite building elements49US 4,233,080 AProduits Chimiques Ugine Kuhlmann · 1980
- Method of treating produced gypsum14US 5,169,617 ARuedersdorfer Zement GmbH · 1992
- Process for preparing calcium sulfate anhydrite6US 5,169,444 AGebruder Knauf Westdeutsche Gipswerke KG · 1992
- Production of synthetic anhydrite5US 4,016,240 ABayer Aktiengesellschaft · 1977
- Method for producing insoluble calcium sulfate anhydrite5US 4,080,422 AUnited States Gypsum Company · 1978