F27D 11/02
Ohmic resistance heating
F27D11/02 (Ohmic resistance heating) appears on 269 US grants and 205 published applications in this corpus.
Search patents in F27D- Granted patents
- 269
- Published applications
- 205
- Assignees
- 218
- Inventors
- 665
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 16 | 0 |
| 1977 | 9 | 0 |
| 1978 | 8 | 0 |
| 1979 | 10 | 0 |
| 1980 | 8 | 0 |
| 1981 | 9 | 0 |
| 1982 | 5 | 0 |
| 1983 | 8 | 0 |
| 1984 | 7 | 0 |
| 1985 | 10 | 0 |
| 1986 | 8 | 0 |
| 1987 | 4 | 0 |
| 1988 | 1 | 0 |
| 1989 | 5 | 0 |
| 1990 | 4 | 0 |
| 1991 | 3 | 0 |
| 1992 | 2 | 0 |
| 1993 | 4 | 0 |
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 3 | 0 |
| 1997 | 4 | 0 |
| 1998 | 2 | 0 |
| 1999 | 4 | 0 |
| 2000 | 5 | 0 |
| 2001 | 4 | 2 |
| 2002 | 2 | 2 |
| 2003 | 5 | 6 |
| 2004 | 6 | 5 |
| 2005 | 2 | 5 |
| 2006 | 4 | 6 |
| 2007 | 2 | 5 |
| 2008 | 2 | 3 |
| 2009 | 1 | 6 |
| 2010 | 0 | 2 |
| 2011 | 0 | 6 |
| 2012 | 2 | 12 |
| 2013 | 9 | 13 |
| 2014 | 5 | 11 |
| 2015 | 7 | 10 |
| 2016 | 7 | 13 |
| 2017 | 9 | 15 |
| 2018 | 7 | 10 |
| 2019 | 12 | 4 |
| 2020 | 7 | 7 |
| 2021 | 8 | 13 |
| 2022 | 2 | 9 |
| 2023 | 5 | 3 |
| 2024 | 10 | 14 |
| 2025 | 5 | 16 |
| 2026 | 4 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
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- Multi-layered structures for electrically heated furnaces utilizing conductive refractory materials28 May 2026US 2026/0146796 A1Sabic Global Technologies B.V.
- Heating element for a substrate processing system21 May 2026US 2026/0139902 A1Black Semiconductor Netherlands B.V.
- Substrate processing apparatus19 Feb 2026US 2026/0049768 A1Wonik Ips Co., Ltd.
Most cited
By later US patents
- Tunnel oven121US 4,554,437 APet Incorporated · 1985
- Inline degassing apparatus111US 6,887,424 B2Pyrotek Japan Limited · 2005
- Immersion heater for molten metal74US 9,108,244 B22015
- Immersion heater for molten metal66US 9,481,035 B2Molten Metal Equipment Innovations, LLC · 2016
- Heat-treating apparatus53US 4,950,870 ATel Sagami Limited · 1990