C01B 32/215
Purification
Official title: Purification; Recovery or purification of graphite formed in iron making, e.g. kish graphite
C01B32/215 (Purification) appears on 42 US grants and 83 published applications in this corpus.
Search patents in C01B- Granted patents
- 42
- Published applications
- 83
- Assignees
- 77
- Inventors
- 240
- Latest grant
- 1 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 3 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 1 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 2 |
| 2006 | 0 | 1 |
| 2007 | 0 | 1 |
| 2008 | 0 | 0 |
| 2009 | 1 | 3 |
| 2010 | 0 | 1 |
| 2011 | 2 | 1 |
| 2012 | 1 | 1 |
| 2013 | 1 | 0 |
| 2014 | 0 | 1 |
| 2015 | 1 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 4 |
| 2018 | 1 | 3 |
| 2019 | 2 | 4 |
| 2020 | 3 | 3 |
| 2021 | 2 | 4 |
| 2022 | 4 | 5 |
| 2023 | 2 | 8 |
| 2024 | 2 | 8 |
| 2025 | 8 | 20 |
| 2026 | 2 | 12 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Process for purifying and producing a high purity particulate graphite material for use in lithium-ion batteries1 Sep 2026US 12,722,978 B1Green Graphite Technologies, Inc.
- Recycled graphite surface repair and conductive carbon separation10 Feb 2026US 12,545,587 B2Ascend Elements, Inc.
- Graphite material purification process7 Oct 2025US 12,434,973 B2Talga Technologies Limited
- Methods for purifying graphite16 Sep 2025US 12,415,731 B1Westwater Resources, Inc.
- Artificial graphite, method for preparing artificial graphite, anode comprising same, and lithium secondary battery26 Aug 2025US 12,401,020 B2LG Energy Solution, Ltd.
- Low-waste process for purification of recycled and natural graphite17 Sep 2026US 2026/0274680 A1
- Method of producing purified graphite17 Sep 2026US 2026/0274681 A1Posco Future M Co., Ltd.
- A process for the purification of graphitic material10 Sep 2026US 2026/0265066 A1Hazer Group Ltd.
- Method for recycling graphite and recycled graphite20 Aug 2026US 2026/0246000 A1Vianode AS
- Method for dry recycling and structure regeneration of layered carbon materials13 Aug 2026US 2026/0234005 A1Rikomay Recycling Singapore Pte. Ltd.
Most cited
By later US patents
- Reclaiming spent potlining16US 4,889,695 AAluminum Company of America · 1989
- Process for producing carbon anode compositions for lithium ion batteries15US 7,993,780 B2Nanotek Instruments, Inc. · 2011
- Method for the continuous chemical reduction and removal of mineral matter contained in carbon structures11US 4,780,112 AOabrand PTY. Limited · 1988
- Methods for purifying carbon materials10US 7,537,682 B2California Institute of Technology · 2009
- Method for separating and recovering kish graphite from mixtures of kish graphite and fume8US 3,932,596 ABethlehem Steel Corporation · 1976