F27D
Details or accessories of furnaces, kilns, ovens or retorts, in so far
Official title: Details or accessories of furnaces, kilns, ovens or retorts, in so far as they are of kinds occurring in more than one kind of furnace
F27D (Details or accessories of furnaces, kilns, ovens or retorts, in so far) appears on 8,771 US grants and 6,679 published applications in this corpus.
Search patents in F27D- Granted patents
- 8,771
- Published applications
- 6,679
- Assignees
- 3,863
- Inventors
- 17,500
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 134 | 0 |
| 1977 | 137 | 0 |
| 1978 | 133 | 0 |
| 1979 | 103 | 0 |
| 1980 | 157 | 0 |
| 1981 | 137 | 0 |
| 1982 | 121 | 0 |
| 1983 | 155 | 0 |
| 1984 | 213 | 0 |
| 1985 | 174 | 0 |
| 1986 | 180 | 0 |
| 1987 | 177 | 0 |
| 1988 | 158 | 0 |
| 1989 | 160 | 0 |
| 1990 | 162 | 0 |
| 1991 | 150 | 0 |
| 1992 | 138 | 0 |
| 1993 | 156 | 0 |
| 1994 | 187 | 0 |
| 1995 | 156 | 0 |
| 1996 | 151 | 0 |
| 1997 | 145 | 0 |
| 1998 | 189 | 0 |
| 1999 | 198 | 0 |
| 2000 | 201 | 0 |
| 2001 | 163 | 56 |
| 2002 | 161 | 144 |
| 2003 | 163 | 147 |
| 2004 | 159 | 205 |
| 2005 | 107 | 150 |
| 2006 | 96 | 170 |
| 2007 | 79 | 197 |
| 2008 | 86 | 207 |
| 2009 | 95 | 210 |
| 2010 | 137 | 223 |
| 2011 | 135 | 276 |
| 2012 | 152 | 281 |
| 2013 | 177 | 327 |
| 2014 | 207 | 345 |
| 2015 | 244 | 381 |
| 2016 | 238 | 391 |
| 2017 | 302 | 289 |
| 2018 | 274 | 317 |
| 2019 | 311 | 271 |
| 2020 | 256 | 298 |
| 2021 | 186 | 307 |
| 2022 | 221 | 314 |
| 2023 | 229 | 317 |
| 2024 | 238 | 308 |
| 2025 | 225 | 312 |
| 2026 | 158 | 236 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Main groups
Granted patents with any code in the group
- F27D 3/00Charging2,657
- F27D 1/00Casings2,176
- F27D 99/00Subject matter not provided for in other groups of this subclass1,515
- F27D 19/00Arrangements of controlling devices1,056
- F27D 21/00Arrangement of monitoring devices967
- F27D 17/00Arrangements for using waste heat889
- F27D 11/00Arrangement of elements for electric heating in or on furnaces792
- F27D 9/00Cooling of furnaces or of charges therein724
All 15 main groupsShow fewer
- F27D 7/00Forming, maintaining or circulating atmospheres in heating chambers723
- F27D 5/00Supports, screens or the like for the charge within the furnace618
- F27D 27/00Stirring devices for molten material357
- F27D 15/00Handling or treating discharged material285
- F27D 13/00Apparatus for preheating charges242
- F27D 25/00Devices or methods for removing incrustations202
- F27D 2201/00Manipulation of furnace partsIndexing code15
Recent patents
- Method for manufacturing direct reduced iron and DRI manufacturing equipment6 Oct 2026US 12,753,452 B2ArcelorMittal
- 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.
- Oxygen detection system and reflow furnace using the same29 Sep 2026US 12,746,614 B2Illinois Tool Works Inc.
- Furnace system29 Sep 2026US 12,747,860 B2Owens-Brockway Glass Container Inc.
- Dental furnace and method for operating a dental furnace29 Sep 2026US 12,747,914 B2Vita Zahnfabrik H. Rauter GmbH & Co.KG
- Gas injection device8 Oct 2026US 2026/0308714 A1SMS group GmbH
- Parallel-flow regenerative shaft kiln and method for burning carbonate rock8 Oct 2026US 2026/0309418 A1Maerz Ofenbau AG
- Direct-fired kiln using recycled flue gas8 Oct 2026US 2026/0309420 A1ExxonMobil Technology and Engineering Company
- Fiber composite felt8 Oct 2026US 2026/0309422 A1Sgl Carbon SE
- Heat treatment apparatus8 Oct 2026US 2026/0309423 A1Tokyo Electron Limited
Most cited
By later US patents
- Movable core fast cool-down furnace577US 4,753,192 ABTU Engineering Corporation · 1988
- Substrate heat treatment apparatus555US 8,608,885 B2Dainippon Screen Mfg.Co., Ltd. · 2013
- Temperature controlled substrate holder with non-uniform insulation layer for a substrate processing system550US 7,723,648 B2Tokyo Electron Limited · 2010
- Susceptor heater shim529US 9,202,727 B2ASM IP Holding B. V. · 2015
- Apparatus and method for calculating a wafer position in a processing chamber under process conditions510US 9,117,866 B2ASM IP Holding B. V. · 2015