F27B 3/20
Arrangements of heating devices
F27B3/20 (Arrangements of heating devices) appears on 222 US grants and 244 published applications in this corpus.
Search patents in F27B- Granted patents
- 222
- Published applications
- 244
- Assignees
- 168
- Inventors
- 465
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 4 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
| 1992 | 4 | 0 |
| 1993 | 3 | 0 |
| 1994 | 4 | 0 |
| 1995 | 5 | 0 |
| 1996 | 7 | 0 |
| 1997 | 6 | 0 |
| 1998 | 4 | 0 |
| 1999 | 12 | 0 |
| 2000 | 4 | 0 |
| 2001 | 3 | 1 |
| 2002 | 4 | 9 |
| 2003 | 7 | 2 |
| 2004 | 9 | 13 |
| 2005 | 3 | 5 |
| 2006 | 3 | 4 |
| 2007 | 4 | 12 |
| 2008 | 2 | 14 |
| 2009 | 8 | 15 |
| 2010 | 12 | 11 |
| 2011 | 7 | 9 |
| 2012 | 11 | 12 |
| 2013 | 13 | 14 |
| 2014 | 6 | 10 |
| 2015 | 6 | 13 |
| 2016 | 8 | 11 |
| 2017 | 7 | 8 |
| 2018 | 8 | 7 |
| 2019 | 9 | 9 |
| 2020 | 4 | 11 |
| 2021 | 4 | 7 |
| 2022 | 7 | 8 |
| 2023 | 6 | 6 |
| 2024 | 3 | 12 |
| 2025 | 5 | 16 |
| 2026 | 1 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Induction coils as non-contact temperature boosters and flow boosters for ferrous and non-ferrous materials in a furnace6 Oct 2026US 12,753,973 B2Inductotherm Corp.
- Method for manufacturing molten iron with electric arc furnace9 Dec 2025US 12,492,439 B2Jfe Steel Corporation
- High-efficiency furnace2 Sep 2025US 12,404,200 B2Saint-Gobain Isover
- High-efficiency photonic furnaces for metal production26 Aug 2025US 12,398,954 B2Limelight Steel Inc.
- DC plasma electric arc furnace for processing solid waste, method of processing solid waste, and products formed from DC plasma electric arc furnace13 May 2025US 12,298,077 B2
- High-efficiency photonic furnaces for metal production23 Apr 2026US 2026/0110493 A1Limelight Steel Inc.
- A gas heater assembly for a gas heating process and a system for a gas heating process12 Mar 2026US 2026/0071751 A1Luossavaara-Kiirunavaara AB
- Melting Furnace and Method for Melting a Metal Material12 Mar 2026US 2026/0071819 A1Bayerische Motoren Werke Aktiengesellschaft
- Apparatus and method for rotary furnace flame control to melt metal5 Mar 2026US 2026/0063366 A1Air Products and Chemicals, Inc.
- Apparatus and Method for Flame Control to Melt Metal5 Mar 2026US 2026/0063367 A1Air Products and Chemicals, Inc.
Most cited
By later US patents
- Method and apparatus for injection of a liquid waste into a molten bath124US 5,436,210 AMolten Metal Technology, Inc. · 1995
- Molten metal treatment furnace with level control and method112US 6,503,292 B2Alcoa Inc. · 2003
- Method and apparatus for producing a product in a regenerator furnace from impure waste containing a non-gasifiable impurity110US 5,640,709 AMolten Metal Technology, Inc. · 1997
- Method and apparatus for producing a product in a regenerator furnace from impure waste containing a non-gasifiable impurity108US 5,640,706 AMolten Metal Technology, Inc. · 1997
- Molten metal dosing furnace with metal treatment and level control and method101US 6,500,228 B1Alcoa Inc. · 2002