F24H 3/04
The air being in direct contact with the heating medium
Official title: the air being in direct contact with the heating medium, e.g. electric heating element
F24H3/04 (The air being in direct contact with the heating medium) appears on 851 US grants and 928 published applications in this corpus.
Search patents in F24H- Granted patents
- 851
- Published applications
- 928
- Assignees
- 529
- Inventors
- 2,020
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 4 | 0 |
| 1978 | 7 | 0 |
| 1979 | 5 | 0 |
| 1980 | 5 | 0 |
| 1981 | 9 | 0 |
| 1982 | 9 | 0 |
| 1983 | 9 | 0 |
| 1984 | 5 | 0 |
| 1985 | 6 | 0 |
| 1986 | 13 | 0 |
| 1987 | 21 | 0 |
| 1988 | 17 | 0 |
| 1989 | 15 | 0 |
| 1990 | 11 | 0 |
| 1991 | 15 | 0 |
| 1992 | 11 | 0 |
| 1993 | 11 | 0 |
| 1994 | 18 | 0 |
| 1995 | 11 | 0 |
| 1996 | 11 | 0 |
| 1997 | 11 | 0 |
| 1998 | 14 | 0 |
| 1999 | 15 | 0 |
| 2000 | 18 | 0 |
| 2001 | 12 | 3 |
| 2002 | 13 | 7 |
| 2003 | 8 | 14 |
| 2004 | 13 | 21 |
| 2005 | 16 | 36 |
| 2006 | 17 | 21 |
| 2007 | 10 | 32 |
| 2008 | 10 | 40 |
| 2009 | 16 | 33 |
| 2010 | 13 | 29 |
| 2011 | 15 | 38 |
| 2012 | 24 | 37 |
| 2013 | 31 | 53 |
| 2014 | 29 | 57 |
| 2015 | 30 | 60 |
| 2016 | 45 | 45 |
| 2017 | 33 | 25 |
| 2018 | 38 | 40 |
| 2019 | 29 | 49 |
| 2020 | 33 | 48 |
| 2021 | 21 | 63 |
| 2022 | 32 | 32 |
| 2023 | 23 | 39 |
| 2024 | 24 | 47 |
| 2025 | 30 | 30 |
| 2026 | 10 | 29 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Hair styling appliance25 Aug 2026US 12,714,215 B2Dyson Technology Limited
- Heat gun having flow guiding arrangement11 Aug 2026US 12,704,293 B2Zhejiang Prulde Electric Appliance Co., Ltd.
- Heating element with open-cell structure4 Aug 2026US 12,701,640 B2Kanthal AB
- Heater assembly30 Jun 2026US 12,669,265 B2Dyson Technology Limited
- Structured body for heating gas23 Jun 2026US 12,661,628 B2Topsoe A/S
- Universal battery system for cordless devices1 Oct 2026US 2026/0298475 A1Enerco Group, Inc.
- Gas heater13 Aug 2026US 2026/0235321 A1Tutco, Inc.
- Electric heater system6 Aug 2026US 2026/0227095 A1Watlow Electric Manufacturing Company
- Fluid heating device16 Jul 2026US 2026/0202091 A1Toshiba Lighting & Technology Corporation
- Hybrid duct device for heating an air flow16 Jul 2026US 2026/0202092 A1Fives Itas S.P.A.
Most cited
By later US patents
- In-line electric heater for an aerosol delivery system176US 4,682,010 ASafeway Products, Inc. · 1987
- Tiltable and adjustably oscillatable portable electric heater/fan166US 4,703,152 AHolmes Products Corp. · 1987
- Operational control schemes for ventilated seat or bed assemblies159US 7,877,827 B2Amerigon Incorporated · 2011
- Combination heater-light-ventilator unit150US 4,681,024 AFasco Industries, Inc. · 1987
- Pivotable heater132US 6,321,034 B2The Holmes Group, Inc. · 2001