F27
Furnaces
Official title: Furnaces; kilns; ovens; retorts
F27 (Furnaces) appears on 11,874 US grants and 8,474 published applications in this corpus.
Search patents in F27- Granted patents
- 11,874
- Published applications
- 8,474
- Assignees
- 4,883
- Inventors
- 22,426
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 220 | 0 |
| 1977 | 233 | 0 |
| 1978 | 211 | 0 |
| 1979 | 151 | 0 |
| 1980 | 245 | 0 |
| 1981 | 248 | 0 |
| 1982 | 216 | 0 |
| 1983 | 248 | 0 |
| 1984 | 311 | 0 |
| 1985 | 273 | 0 |
| 1986 | 254 | 0 |
| 1987 | 229 | 0 |
| 1988 | 217 | 0 |
| 1989 | 229 | 0 |
| 1990 | 212 | 0 |
| 1991 | 212 | 0 |
| 1992 | 198 | 0 |
| 1993 | 216 | 0 |
| 1994 | 246 | 0 |
| 1995 | 217 | 0 |
| 1996 | 201 | 0 |
| 1997 | 186 | 0 |
| 1998 | 257 | 0 |
| 1999 | 268 | 0 |
| 2000 | 239 | 0 |
| 2001 | 221 | 67 |
| 2002 | 210 | 165 |
| 2003 | 197 | 179 |
| 2004 | 193 | 260 |
| 2005 | 128 | 186 |
| 2006 | 126 | 225 |
| 2007 | 96 | 248 |
| 2008 | 120 | 308 |
| 2009 | 131 | 283 |
| 2010 | 187 | 314 |
| 2011 | 190 | 357 |
| 2012 | 229 | 390 |
| 2013 | 250 | 424 |
| 2014 | 268 | 422 |
| 2015 | 307 | 461 |
| 2016 | 297 | 484 |
| 2017 | 375 | 353 |
| 2018 | 330 | 386 |
| 2019 | 376 | 344 |
| 2020 | 311 | 363 |
| 2021 | 243 | 382 |
| 2022 | 272 | 382 |
| 2023 | 300 | 407 |
| 2024 | 292 | 398 |
| 2025 | 291 | 388 |
| 2026 | 197 | 298 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subclasses
Granted patents
Recent patents
- Object orientation adjusting device6 Oct 2026US 12,753,020 B2NGK Insulators, Ltd.
- 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.
- Sintering devices, sintering assemblies, and associated methods8 Oct 2026US 2026/0307146 A1Battelle Energy Alliance, LLC
- Gas injection device8 Oct 2026US 2026/0308714 A1SMS group GmbH
- Multiple hearth furnace for placing a solid and a gas in contact8 Oct 2026US 2026/0309411 A1Avril
- Parallel-flow regenerative shaft kiln and method for burning carbonate rock8 Oct 2026US 2026/0309418 A1Maerz Ofenbau AG
- Climate-friendly puzzolana production8 Oct 2026US 2026/0309419 A1thyssenkrupp AG
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
- Thermal process station with heated lid553US 6,884,066 B2FSI International, Inc. · 2005
- 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