F04C 29/04
Heating
Official title: Heating; Cooling (of machines or engines in general F01P); Heat insulation (heat insulation in general F16L59/00)
F04C29/04 (Heating) appears on 1,014 US grants and 1,112 published applications in this corpus.
Search patents in F04C- Granted patents
- 1,014
- Published applications
- 1,112
- Assignees
- 365
- Inventors
- 2,174
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 4 | 0 |
| 1978 | 3 | 0 |
| 1979 | 3 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 4 | 0 |
| 1985 | 6 | 0 |
| 1986 | 3 | 0 |
| 1987 | 4 | 0 |
| 1988 | 7 | 0 |
| 1989 | 6 | 0 |
| 1990 | 7 | 0 |
| 1991 | 7 | 0 |
| 1992 | 7 | 0 |
| 1993 | 8 | 0 |
| 1994 | 5 | 0 |
| 1995 | 11 | 0 |
| 1996 | 10 | 0 |
| 1997 | 10 | 0 |
| 1998 | 10 | 0 |
| 1999 | 8 | 0 |
| 2000 | 19 | 0 |
| 2001 | 24 | 6 |
| 2002 | 17 | 33 |
| 2003 | 34 | 38 |
| 2004 | 24 | 43 |
| 2005 | 21 | 27 |
| 2006 | 32 | 30 |
| 2007 | 18 | 18 |
| 2008 | 10 | 40 |
| 2009 | 11 | 29 |
| 2010 | 15 | 36 |
| 2011 | 13 | 33 |
| 2012 | 24 | 35 |
| 2013 | 24 | 37 |
| 2014 | 25 | 41 |
| 2015 | 33 | 57 |
| 2016 | 37 | 42 |
| 2017 | 38 | 44 |
| 2018 | 38 | 62 |
| 2019 | 43 | 57 |
| 2020 | 52 | 65 |
| 2021 | 52 | 60 |
| 2022 | 60 | 52 |
| 2023 | 45 | 52 |
| 2024 | 76 | 55 |
| 2025 | 60 | 74 |
| 2026 | 37 | 46 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Electric compressor6 Oct 2026US 12,753,764 B2Kabushiki Kaisha Toyota Jidoshokki
- Air compressor29 Sep 2026US 12,747,730 B2Hitachi Industrial Equipment Systems Co., Ltd.
- Compressor device with cooling, and method for operating a compressor device29 Sep 2026US 12,747,731 B2Kaeser Kompressoren SE
- Vertical type compressor and laundry treating apparatus having the same22 Sep 2026US 12,742,456 B2LG Electronics Inc.
- Compressor system having integrated ambient sensor15 Sep 2026US 12,736,051 B2Kaeser Kompressoren SE
- Rotary compressor8 Oct 2026US 2026/0309155 A1Fujitsu General Limited
- Vacuum pump17 Sep 2026US 2026/0275984 A1
- Thermistor flow path10 Sep 2026US 2026/0266285 A1GHSP, Inc.
- Gas Compressor20 Aug 2026US 2026/0243258 A1Hitachi Industrial Equipment Systems Co., Ltd.
- Gas Compressor20 Aug 2026US 2026/0243261 A1Hitachi Industrial Equipment Systems Co., Ltd.
Most cited
By later US patents
- Sub-sea pumping system and associated method including pressure compensating arrangement for cooling and lubricating128US 6,059,539 AWestinghouse Government Services Company LLC · 2000
- Compressor with control and protection system115US 6,302,654 B1Copeland Corporation · 2001
- Sub-sea pumping system and an associated method including pressure compensating arrangement for cooling and lubricating fluid105US 5,795,135 AWestinghouse Electric Corp. · 1998
- Scroll compressor with means for end plate bias and cooled gas return to sealed compressor spaces96US 4,216,661 AHitachi, Ltd. · 1980
- Scroll machine having liquid injection controlled by internal valve92US 5,640,854 ACopeland Corporation · 1997