C21D 9/663
Bell-type furnaces
C21D9/663 (Bell-type furnaces) appears on 112 US grants and 52 published applications in this corpus.
Search patents in C21D- Granted patents
- 112
- Published applications
- 52
- Assignees
- 63
- Inventors
- 211
- Latest grant
- 5 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 5 | 0 |
| 1980 | 2 | 0 |
| 1981 | 4 | 0 |
| 1982 | 2 | 0 |
| 1983 | 2 | 0 |
| 1984 | 3 | 0 |
| 1985 | 6 | 0 |
| 1986 | 5 | 0 |
| 1987 | 3 | 0 |
| 1988 | 2 | 0 |
| 1989 | 6 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 7 | 0 |
| 1995 | 3 | 0 |
| 1996 | 5 | 0 |
| 1997 | 4 | 0 |
| 1998 | 4 | 0 |
| 1999 | 3 | 0 |
| 2000 | 2 | 0 |
| 2001 | 3 | 0 |
| 2002 | 2 | 0 |
| 2003 | 2 | 2 |
| 2004 | 1 | 2 |
| 2005 | 0 | 1 |
| 2006 | 0 | 1 |
| 2007 | 1 | 0 |
| 2008 | 2 | 2 |
| 2009 | 0 | 2 |
| 2010 | 1 | 1 |
| 2011 | 1 | 2 |
| 2012 | 1 | 7 |
| 2013 | 1 | 2 |
| 2014 | 4 | 6 |
| 2015 | 1 | 2 |
| 2016 | 5 | 4 |
| 2017 | 1 | 0 |
| 2018 | 2 | 1 |
| 2019 | 1 | 3 |
| 2020 | 2 | 2 |
| 2021 | 1 | 1 |
| 2022 | 1 | 2 |
| 2023 | 2 | 4 |
| 2024 | 1 | 2 |
| 2025 | 1 | 1 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Hot uncoiling of metal5 May 2026US 12,618,130 B2Novelis Inc.
- System for and method of processing waste lithium-ion battery1 Apr 2025US 12,266,770 B2Kawasaki Jukogyo Kabushiki Kaisha
- Non oriented electrical steel sheet9 Apr 2024US 11,952,641 B2Nippon Steel Corporation
- Portable carrier device for a furnace charge and handling system for the carrier device7 Nov 2023US 11,807,913 B2EBNER Industrieofenbau GmbH
- Arrangement having plural temperature-control stations for heat treating component parts, and their handling9 May 2023US 11,644,239 B2EBNER Industrieofenbau GmbH
- An annealing apparatus for a metal strip coating system17 Sep 2026US 2026/0275448 A1Danieli & C. Officine Meccaniche SpA
- Hot uncoiling of metal5 Mar 2026US 2026/0062783 A1Novelis Inc.
- Device for tempering an object6 Feb 2025US 2025/0044030 A1EBNER Industrieofenbau GmbH
- Dehydrogenation apparatus, steel sheet production system, and steel sheet production method24 Oct 2024US 2024/0352549 A1Jfe Steel Corporation
- Steel strip made of a high-strength multiphase steel and process for producing such a steel strip13 Jun 2024US 2024/0191319 A1
Most cited
By later US patents
- Insulated furnace door and wall panel system72US 5,483,548 A1996
- Batch coil annealing furnace baseplate31US 4,310,302 AMidland-Ross Corporation · 1982
- Annealing furnace30US 4,846,675 AWorthington Industries, Inc. · 1989
- Batch coil annealing furnace and method28US 4,596,526 AWorthington Industries, Inc. · 1986
- Diffuser system for annealing furnace19US 4,516,758 A1985