C01G 49/04
Ferrous oxide [feo]
Official title: Ferrous oxide [FeO]
C01G49/04 (Ferrous oxide [feo]) appears on 39 US grants and 57 published applications in this corpus.
Search patents in C01G- Granted patents
- 39
- Published applications
- 57
- Assignees
- 51
- Inventors
- 149
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 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 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 3 |
| 2004 | 1 | 0 |
| 2005 | 0 | 1 |
| 2006 | 0 | 2 |
| 2007 | 0 | 3 |
| 2008 | 0 | 2 |
| 2009 | 2 | 1 |
| 2010 | 1 | 5 |
| 2011 | 1 | 2 |
| 2012 | 3 | 3 |
| 2013 | 2 | 3 |
| 2014 | 2 | 2 |
| 2015 | 2 | 4 |
| 2016 | 4 | 2 |
| 2017 | 2 | 3 |
| 2018 | 1 | 1 |
| 2019 | 1 | 3 |
| 2020 | 2 | 2 |
| 2021 | 0 | 2 |
| 2022 | 2 | 2 |
| 2023 | 2 | 4 |
| 2024 | 3 | 3 |
| 2025 | 1 | 4 |
| 2026 | 2 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Water treatment and purification method25 Aug 2026US 12,715,781 B2Imam Abdulrahman Bin Faisal University
- Method for separating iron element in brine and application thereof26 May 2026US 12,637,360 B2BYD Company Limited
- Deep bluish-black effect pigments23 Dec 2025US 12,503,604 B2Susonity Commercial GmbH
- Method for treating water contaminated with polycyclic organics31 Dec 2024US 12,180,087 B2Imam Abdulrahman Bin Faisal University
- Method for treating polluted composition25 Jun 2024US 12,017,925 B2Imam Abdulrahman Bin Faisal University
- High efficiency acid-base leaching methods and systems25 Dec 2025US 2025/0388512 A1Sublime Systems, Inc.
- Sequential hydrometalurgical recovery of metal values with sequestered carbon11 Sep 2025US 2025/0282633 A1Negative Emissions Materials, Inc.
- Process for the refining of iron oxides, iron oxides resulting thereof and their use6 Feb 2025US 2025/0042764 A1BASF SE
- Method for removing impurities from nanoparticles16 Jan 2025US 2025/0017868 A1AlphaOnco
- Water treatment and purification method5 Dec 2024US 2024/0400407 A1Imam Abdulrahman Bin Faisal University
Most cited
By later US patents
- Very high purity fine powders and methods to produce such powders142US 6,569,397 B12003
- High purity fine metal powders and methods to produce such powder117US 6,786,950 B2NanoProducts Corporation · 2004
- Process for removal of silica from geothermal brine72US 4,016,075 ASouthern Pacific Land Co. · 1977
- Nano-sized particles, processes of making, compositions and uses thereof27US 8,182,786 B2The Trustees of Columbia University in the City of New York · 2012
- Production of carbon filaments25US 4,565,683 AExxon Research & Engineering Co. · 1986