C03C 1/022
Purification of silica sand or other minerals
Official title: {Purification of silica sand or other minerals}
C03C1/022 (Purification of silica sand or other minerals) appears on 52 US grants and 33 published applications in this corpus.
Search patents in C03C- Granted patents
- 52
- Published applications
- 33
- Assignees
- 45
- Inventors
- 130
- Latest grant
- 31 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 2 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 4 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 1 |
| 2002 | 2 | 0 |
| 2003 | 1 | 2 |
| 2004 | 2 | 0 |
| 2005 | 0 | 0 |
| 2006 | 2 | 3 |
| 2007 | 0 | 1 |
| 2008 | 1 | 1 |
| 2009 | 0 | 2 |
| 2010 | 1 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 1 |
| 2014 | 1 | 1 |
| 2015 | 0 | 0 |
| 2016 | 0 | 2 |
| 2017 | 1 | 2 |
| 2018 | 0 | 1 |
| 2019 | 0 | 7 |
| 2020 | 4 | 2 |
| 2021 | 0 | 1 |
| 2022 | 3 | 2 |
| 2023 | 3 | 1 |
| 2024 | 3 | 0 |
| 2025 | 0 | 1 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Impurity removal method of silicate solid waste and its application31 Mar 2026US 12,589,420 B2Wuhan University of Technology
- Quartz glass with low content of hydroxyl and high purity and method for preparing the same14 May 2024US 11,981,594 B2Jiangsu Zhongtian Technology Co., Ltd.
- Low iron silica sand product and method of making same19 Mar 2024US 11,932,569 B1
- Purification of quartz powders by removal of microparticles of refractory materials23 Jan 2024US 11,878,937 B2Heraeus Conamic UK Limited
- Preparation of a quartz glass body in a multi-chamber oven25 Jul 2023US 11,708,290 B2Heraeus Quarzglas GmbH & Co.KG
- Process for producing a hot blended material of amorphous silicon dioxide – crystalline silicon dioxide, process for producing artificial stone from the material by press-vibration method in vacuum environment and the artificial stone product obtained from this process29 Jan 2026US 2026/0028278 A1A&A Green Phoenix Group Joint Stock Company
- Process for separating iron-bearing impurities from a host matrix12 Jun 2025US 2025/0187022 A1Bhmpc Investments Pty Ltd
- Impurity Removal Method of Silicate Solid Waste and Its Application6 Jul 2023US 2023/0211392 A1Wuhan University of Technology
- Removal of sand impurities in wet processing1 Dec 2022US 2022/0380246 A1Halliburton Energy Services, Inc.
- Quartz glass with low content of hydroxyl and high purity and method for preparing the same27 Oct 2022US 2022/0340469 A1Jiangsu Zhongtian Technology Co., Ltd.
Most cited
By later US patents
- Multi-speed winch39US 5,842,684 AMileMarker, Inc. · 1998
- Method of purifying silica and depositing on an optical fiber preform34US 6,269,663 B1Alcatel · 2001
- Method of recycling mixed colored cullet into amber, green, or flint glass27US 5,718,737 AInternational Cullet Exchange. Inc. · 1998
- Process for continuous refining of quartz powder25US 5,637,284 AHeraeus Quarzglas GmbH & Co.KG · 1997
- Process for producing unsintered cristobalite silica20US 4,853,198 AMitsubishi Rayon Co., Ltd. · 1989