C21B 13/08
In rotary furnaces
Official title: in rotary furnaces
C21B13/08 (In rotary furnaces) appears on 111 US grants and 37 published applications in this corpus.
Search patents in C21B- Granted patents
- 111
- Published applications
- 37
- Assignees
- 63
- Inventors
- 178
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 2 | 0 |
| 1978 | 2 | 0 |
| 1979 | 4 | 0 |
| 1980 | 10 | 0 |
| 1981 | 7 | 0 |
| 1982 | 5 | 0 |
| 1983 | 11 | 0 |
| 1984 | 4 | 0 |
| 1985 | 1 | 0 |
| 1986 | 4 | 0 |
| 1987 | 4 | 0 |
| 1988 | 3 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 3 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 3 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 3 | 0 |
| 1999 | 3 | 0 |
| 2000 | 1 | 0 |
| 2001 | 4 | 2 |
| 2002 | 4 | 3 |
| 2003 | 3 | 0 |
| 2004 | 1 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 1 | 2 |
| 2010 | 0 | 2 |
| 2011 | 0 | 1 |
| 2012 | 1 | 0 |
| 2013 | 2 | 2 |
| 2014 | 1 | 3 |
| 2015 | 2 | 0 |
| 2016 | 2 | 0 |
| 2017 | 0 | 1 |
| 2018 | 1 | 0 |
| 2019 | 0 | 2 |
| 2020 | 1 | 1 |
| 2021 | 0 | 1 |
| 2022 | 0 | 0 |
| 2023 | 1 | 8 |
| 2024 | 0 | 3 |
| 2025 | 1 | 0 |
| 2026 | 4 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method and apparatus for manufacturing cement using rotary generated thermal energy28 Jul 2026US 12,692,192 B2Coolbrook Oy
- Drive shaft assembly for a rotary furnace21 Jul 2026US 12,687,340 B2X-energy, LLC
- Method and apparatus for heating fluids in processes related to refining and petrochemical industries using rotary generated thermal energy9 Jun 2026US 12,649,689 B2Coolbrook Oy
- Direct reduction of iron by hydrogen plasma in a rotary kiln reactor5 May 2026US 12,618,120 B2Uchicago Argonne, LLC
- System for processing red mud and method of processing red mud22 Jul 2025US 12,365,954 B2Red Mud Enterprises LLC
- Refining and/or petrochemical facility and apparatus for heating fluids in processes related to refining and petrochemical industries using rotary generated thermal energy17 Sep 2026US 2026/0274747 A1Coolbrook Oy
- Direct reduction of iron by hydrogen plasma in a rotary kiln reactor27 Aug 2026US 2026/0250794 A1Uchicago Argonne, LLC
- System for processing red mud and method of processing red mud1 Jan 2026US 2026/0002225 A1Red Mud Enterprises LLC
- Drive shaft assembly for a rotary furnace7 Nov 2024US 2024/0369302 A1X-energy, LLC
- Pyrometallurgical Method for Recycling Shredded Material of Waste from the Production of New and Defective or End-of-Life Batteries for Electric Vehicles or Portable Li-Ion Batteries13 Jun 2024US 2024/0191316 A1Eco'ring
Most cited
By later US patents
- Direct reduction process in a rotary hearth furnace56US 5,186,741 AZia Patent Company · 1993
- Direct iron and steelmaking49US 6,383,251 B12002
- Process for treating metal oxide fines33US 5,601,631 AMaumee Research & Engineering, Inc. · 1997
- Reaction apparatus and method27US 4,655,146 A1987
- Apparatus and process for direct reduction of materials in a kiln26US 5,100,314 ASvedala Industries, Inc. · 1992