F27D 99/0006
Electric heating elements or system
Official title: {Electric heating elements or system}
F27D99/0006 (Electric heating elements or system) appears on 515 US grants and 410 published applications in this corpus.
Search patents in F27D- Granted patents
- 515
- Published applications
- 410
- Assignees
- 412
- Inventors
- 1,322
- Latest grant
- 14 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 5 | 0 |
| 1980 | 4 | 0 |
| 1981 | 2 | 0 |
| 1982 | 4 | 0 |
| 1983 | 5 | 0 |
| 1984 | 5 | 0 |
| 1985 | 15 | 0 |
| 1986 | 7 | 0 |
| 1987 | 8 | 0 |
| 1988 | 7 | 0 |
| 1989 | 3 | 0 |
| 1990 | 4 | 0 |
| 1991 | 15 | 0 |
| 1992 | 12 | 0 |
| 1993 | 7 | 0 |
| 1994 | 21 | 0 |
| 1995 | 11 | 0 |
| 1996 | 17 | 0 |
| 1997 | 12 | 0 |
| 1998 | 16 | 0 |
| 1999 | 16 | 0 |
| 2000 | 23 | 0 |
| 2001 | 13 | 8 |
| 2002 | 22 | 16 |
| 2003 | 23 | 20 |
| 2004 | 9 | 13 |
| 2005 | 12 | 16 |
| 2006 | 9 | 11 |
| 2007 | 6 | 10 |
| 2008 | 8 | 13 |
| 2009 | 4 | 14 |
| 2010 | 4 | 15 |
| 2011 | 3 | 17 |
| 2012 | 7 | 12 |
| 2013 | 15 | 17 |
| 2014 | 15 | 20 |
| 2015 | 10 | 28 |
| 2016 | 22 | 16 |
| 2017 | 18 | 15 |
| 2018 | 13 | 15 |
| 2019 | 19 | 11 |
| 2020 | 6 | 9 |
| 2021 | 7 | 9 |
| 2022 | 10 | 14 |
| 2023 | 7 | 18 |
| 2024 | 10 | 28 |
| 2025 | 10 | 20 |
| 2026 | 6 | 25 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F27D 2099/0008Resistor heatingIndexing code133
- F27D 2099/0015Induction heatingIndexing code85
- F27D 2099/0028Microwave heatingIndexing code64
- F27D 2099/0031Plasma-torch heatingIndexing code49
- F27D 2099/0021Arc heatingIndexing code46
- F27D 2099/0026With a generator of electromagnetic radiationsIndexing code18
- F27D 2099/0025Currents through the chargeIndexing code16
- F27D 2099/003Bombardment heatingIndexing code8
Recent patents
- Rotary kiln14 Jul 2026US 12,680,760 B2LG Chem.Ltd.
- Electrically decoupled high-temperature thermal insulation30 Jun 2026US 12,669,288 B2Sgl Carbon SE
- Sintering furnace9 Jun 2026US 12,650,263 B2Amann Girrbach AG
- Apparatus and method for preparation of negative electrode material17 Mar 2026US 12,576,379 B2Epsilon Advanced Materials PVT Ltd
- External combustion air preheat17 Feb 2026US 12,553,669 B2Lummus Technology Inc.
- Method and device for plasma heating of the internal walls of a vacuum furnace1 Oct 2026US 2026/0302140 A1
- Heater plate with different emissivity for temperature uniformity17 Sep 2026US 2026/0282805 A1ASM IP Holding B. V.
- Calcination reactor arrangement, calcination system and calcination method20 Aug 2026US 2026/0241355 A1Limearc Process AB
- Method for operating an annealing furnace13 Aug 2026US 2026/0235362 A1SMS group GmbH
- Biomass Direct Reduced Iron23 Jul 2026US 2026/0209873 A1Technological Resources Pty. Limited
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