G01N 33/222
Solid fuels
Official title: {Solid fuels, e.g. coal}
G01N33/222 (Solid fuels) appears on 121 US grants and 83 published applications in this corpus.
Search patents in G01N- Granted patents
- 121
- Published applications
- 83
- Assignees
- 83
- Inventors
- 309
- Latest grant
- 21 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 3 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 3 | 0 |
| 1982 | 0 | 0 |
| 1983 | 4 | 0 |
| 1984 | 3 | 0 |
| 1985 | 4 | 0 |
| 1986 | 2 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 6 | 0 |
| 1990 | 3 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 4 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 1 |
| 2003 | 1 | 1 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 1 | 0 |
| 2009 | 0 | 0 |
| 2010 | 1 | 1 |
| 2011 | 1 | 1 |
| 2012 | 3 | 3 |
| 2013 | 1 | 3 |
| 2014 | 1 | 6 |
| 2015 | 5 | 5 |
| 2016 | 4 | 5 |
| 2017 | 3 | 5 |
| 2018 | 7 | 5 |
| 2019 | 5 | 8 |
| 2020 | 5 | 6 |
| 2021 | 10 | 7 |
| 2022 | 1 | 5 |
| 2023 | 6 | 5 |
| 2024 | 6 | 7 |
| 2025 | 5 | 4 |
| 2026 | 5 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Coal analyzer, coal analysis method, mixed coal preparation method, and coke production method21 Jul 2026US 12,687,492 B2Jfe Steel Corporation
- Coal spontaneous combustion downhole detection system and method based on self-potential method14 Jul 2026US 12,681,203 B2Shandong University of Science and Technology
- Method for evaluating thermoplasticity of coal or caking additive28 Apr 2026US 12,613,176 B2Jfe Steel Corporation
- Method for preparing coal or caking additive and method for producing coke3 Mar 2026US 12,565,619 B2Jfe Steel Corporation
- Custom coke production20 Jan 2026US 12,528,992 B2
- Method and analyzer for density-based coal quality parameter analysis using big data23 Jul 2026US 2026/0211901 A1
- Testing device for entire process of borehole deformation-crack evolution of coal mass and evaluation method thereof16 Jul 2026US 2026/0202294 A1Shandong Energy Group Co., Ltd
- Material analysis method19 Feb 2026US 2026/0049969 A1Hyundai Steel Company
- Methods for producing graphene from coal15 Jan 2026US 2026/0015241 A1Carbon Holdings Intellectual Properties, LLC
- Coal blends, foundry coke products, and associated systems, devices, and methods7 Aug 2025US 2025/0250489 A1Suncoke Technology and Development LLC
Most cited
By later US patents
- Crucible with lid112US 4,303,615 AFisher Scientific Company · 1981
- Automatic volatile matter content analyzer98US 4,459,103 AHazen Research, Inc. · 1984
- Fluid cell substance analysis and calibration methods79US 5,285,071 A1994
- Method and apparatus for testing coal coking properties51US 10,053,627 B2Suncoke Technology and Development LLC · 2018
- Method for manufacturing coke45US 9,463,980 B2Jfe Steel Corporation · 2016