C21B 7/12
Opening or sealing the tap holes
C21B7/12 (Opening or sealing the tap holes) appears on 135 US grants and 47 published applications in this corpus.
Search patents in C21B- Granted patents
- 135
- Published applications
- 47
- Assignees
- 77
- Inventors
- 246
- Latest grant
- 7 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 10 | 0 |
| 1978 | 7 | 0 |
| 1979 | 3 | 0 |
| 1980 | 5 | 0 |
| 1981 | 6 | 0 |
| 1982 | 1 | 0 |
| 1983 | 7 | 0 |
| 1984 | 3 | 0 |
| 1985 | 3 | 0 |
| 1986 | 4 | 0 |
| 1987 | 3 | 0 |
| 1988 | 2 | 0 |
| 1989 | 2 | 0 |
| 1990 | 4 | 0 |
| 1991 | 7 | 0 |
| 1992 | 0 | 0 |
| 1993 | 5 | 0 |
| 1994 | 6 | 0 |
| 1995 | 6 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 3 | 0 |
| 2001 | 5 | 1 |
| 2002 | 1 | 0 |
| 2003 | 1 | 1 |
| 2004 | 2 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 4 |
| 2008 | 0 | 2 |
| 2009 | 4 | 2 |
| 2010 | 1 | 4 |
| 2011 | 1 | 5 |
| 2012 | 2 | 1 |
| 2013 | 2 | 1 |
| 2014 | 2 | 1 |
| 2015 | 1 | 0 |
| 2016 | 0 | 2 |
| 2017 | 2 | 3 |
| 2018 | 1 | 2 |
| 2019 | 3 | 4 |
| 2020 | 2 | 0 |
| 2021 | 1 | 1 |
| 2022 | 3 | 4 |
| 2023 | 1 | 3 |
| 2024 | 1 | 1 |
| 2025 | 3 | 2 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Oxygen lance guiding assembly7 Apr 2026US 12,595,964 B2Tmt Tapping-Measuring-Technology Sarl
- Manipulator arm, and manipulator comprising a manipulator arm25 Nov 2025US 12,480,712 B2Tmt Tapping-Measuring-Technology Sarl
- Blast furnace operation method5 Aug 2025US 12,378,615 B2Jfe Steel Corporation
- Method of heating up furnace bottom, and burner lance used in the method25 Mar 2025US 12,259,184 B2Jfe Steel Corporation
- Tap hole plug gun31 Dec 2024US 12,181,222 B2Tmt Tapping-Measuring-Technology Sarl
- Slag blocking device for a metallurgical vessel23 Jul 2026US 2026/0208261 A1Refractory Intellectual Property GmbH & Co.KG
- Delay Ignitor Cap, Blowback Ignitor Cap, and Combination Ignitor Cap for a Thermal Lance and Thermal Lances Including Such Ignitor Caps6 Mar 2025US 2025/0075279 A1Reuning-McKim, Inc.
- Manipulator arm, and manipulator comprising a manipulator arm13 Feb 2025US 2025/0052499 A1Tmt Tapping-Measuring-Technology Sarl
- Oxygen lance guiding assembly4 Jul 2024US 2024/0219121 A1Tmt Tapping-Measuring-Technology Sarl
- Device and method for maintaining efficient a tapping channel of a furnace for the production of metal5 Oct 2023US 2023/0314078 A1More S.R.L.
Most cited
By later US patents
- Process for making refractory shapes119US 4,150,078 ALava Crucible Refractories Company · 1979
- Furnace taphole drilling apparatus and method34US 4,418,894 APaul Wurth S. A. · 1983
- Plugging compositions for blast furnace tap holes22US 4,072,531 ASumitomo Durez Company, Ltd. · 1978
- Composition for plugging blast-furnace tap-hole16US 4,022,739 ATerrac Company Limited · 1977
- Plugging refractory material having resin binder system15US 4,379,866 AGeneral Refractories Company · 1983