F27D 99/0001
Heating elements or systems
Official title: {Heating elements or systems}
F27D99/0001 (Heating elements or systems) appears on 1,044 US grants and 802 published applications in this corpus.
Search patents in F27D- Granted patents
- 1,044
- Published applications
- 802
- Assignees
- 756
- Inventors
- 2,551
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 8 | 0 |
| 1977 | 5 | 0 |
| 1978 | 4 | 0 |
| 1979 | 6 | 0 |
| 1980 | 8 | 0 |
| 1981 | 10 | 0 |
| 1982 | 6 | 0 |
| 1983 | 10 | 0 |
| 1984 | 14 | 0 |
| 1985 | 29 | 0 |
| 1986 | 16 | 0 |
| 1987 | 23 | 0 |
| 1988 | 18 | 0 |
| 1989 | 7 | 0 |
| 1990 | 16 | 0 |
| 1991 | 23 | 0 |
| 1992 | 22 | 0 |
| 1993 | 22 | 0 |
| 1994 | 32 | 0 |
| 1995 | 19 | 0 |
| 1996 | 30 | 0 |
| 1997 | 25 | 0 |
| 1998 | 30 | 0 |
| 1999 | 36 | 0 |
| 2000 | 40 | 0 |
| 2001 | 28 | 11 |
| 2002 | 41 | 28 |
| 2003 | 31 | 32 |
| 2004 | 27 | 25 |
| 2005 | 20 | 28 |
| 2006 | 11 | 18 |
| 2007 | 13 | 24 |
| 2008 | 11 | 20 |
| 2009 | 8 | 26 |
| 2010 | 12 | 35 |
| 2011 | 7 | 27 |
| 2012 | 18 | 36 |
| 2013 | 26 | 37 |
| 2014 | 24 | 37 |
| 2015 | 25 | 54 |
| 2016 | 33 | 49 |
| 2017 | 39 | 27 |
| 2018 | 32 | 29 |
| 2019 | 40 | 30 |
| 2020 | 25 | 26 |
| 2021 | 18 | 22 |
| 2022 | 25 | 26 |
| 2023 | 21 | 38 |
| 2024 | 15 | 37 |
| 2025 | 20 | 36 |
| 2026 | 15 | 44 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F27D 99/0006Electric heating elements or system515
- F27D 99/0033Using burners474
- F27D 2099/0058Means for heating the charge locallyIndexing code28
- F27D 2099/0061Indirect heatingIndexing code25
- F27D 99/0003With particulate fuel15
- F27D 2099/006Auxiliary heatingIndexing code11
- F27D 99/0005Injecting liquid fuel4
- F27D 2099/0068Heating directly by circulation of a fluid other than a gas orIndexing code1
Recent patents
- Method and device for heating a furnace18 Aug 2026US 12,710,173 B2Linde Aktiengesellschaft
- Rotary kiln14 Jul 2026US 12,680,760 B2LG Chem.Ltd.
- Electrically decoupled high-temperature thermal insulation30 Jun 2026US 12,669,288 B2Sgl Carbon SE
- Burner, apparatus and method for the firing of ceramic articles16 Jun 2026US 12,656,062 B2Sacmi Forni & Filter S.P.A.
- Sintering furnace9 Jun 2026US 12,650,263 B2Amann Girrbach AG
- Method for flame control in a rotary lime kiln1 Oct 2026US 2026/0298539 A1Valmet Corporation
- Method and device for plasma heating of the internal walls of a vacuum furnace1 Oct 2026US 2026/0302140 A1
- Apparatus and method for heat treatment of wood24 Sep 2026US 2026/0286227 A1
- Heater plate with different emissivity for temperature uniformity17 Sep 2026US 2026/0282805 A1ASM IP Holding B. V.
- Method of heating a steel semi-product in a heating furnace, and associated heating furnace3 Sep 2026US 2026/0259005 A1
Most cited
By later US patents
- Rapid thermal heating apparatus and method220US 5,155,336 AAPPLIED Materials.Inc. · 1992
- Method and apparatus for fabrication of cobalt alloy composite inserts211US 6,063,333 ADennis Tool Company · 2000
- Method of heating semiconductor wafers in order to achieve annealing, silicide formation, reflow of glass passivation layers, etc.145US 4,698,486 ATamarack Scientific Co., Inc. · 1987
- Apparatus for heating semiconductor wafers in order to achieve annealing, silicide formation, reflow of glass passivation layers, etc.140US 4,649,261 ATamarack Scientific Co., Inc. · 1987
- Low temperature, low pressure, ductile, bonded cermet for enhanced abrasion and erosion performance129US 5,641,921 ADennis Tool Company · 1997