F01C 21/06
Heating
Official title: Heating; Cooling (of machines or engines in general F01P); Heat insulation (heat insulation in general F16L)
F01C21/06 (Heating) appears on 194 US grants and 159 published applications in this corpus.
Search patents in F01C- Granted patents
- 194
- Published applications
- 159
- Assignees
- 94
- Inventors
- 274
- Latest grant
- 12 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 9 | 0 |
| 1977 | 12 | 0 |
| 1978 | 8 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 3 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 2 | 0 |
| 2002 | 1 | 1 |
| 2003 | 2 | 5 |
| 2004 | 3 | 2 |
| 2005 | 1 | 1 |
| 2006 | 3 | 5 |
| 2007 | 3 | 2 |
| 2008 | 0 | 3 |
| 2009 | 2 | 5 |
| 2010 | 3 | 7 |
| 2011 | 2 | 8 |
| 2012 | 3 | 6 |
| 2013 | 3 | 11 |
| 2014 | 13 | 11 |
| 2015 | 8 | 15 |
| 2016 | 11 | 8 |
| 2017 | 12 | 10 |
| 2018 | 11 | 10 |
| 2019 | 5 | 6 |
| 2020 | 9 | 11 |
| 2021 | 9 | 8 |
| 2022 | 8 | 7 |
| 2023 | 6 | 3 |
| 2024 | 10 | 8 |
| 2025 | 8 | 5 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Self-cooled rotary engine and pump12 May 2026US 12,624,656 B1
- Apparatus for energy conversion31 Mar 2026US 12,590,550 B2G-En Pte Ltd
- Rotary engine with seal having elastomeric member and shield23 Sep 2025US 12,421,912 B2Pratt & Whitney Canada Corp.
- Rotary engine and cooling systems thereof13 May 2025US 12,297,738 B1Pratt & Whitney Canada Corp.
- Rotary engine and cooling systems thereof1 Apr 2025US 12,264,616 B1Pratt & Whitney Canada Corp.
- Rotary Engine Housing16 Jul 2026US 2026/0201831 A1Pratt & Whitney Canada Corp.
- Apparatus for energy conversion12 Jun 2025US 2025/0188854 A1G-En Pte Ltd
- Rotary engine, parts thereof, and methods5 Jun 2025US 2025/0179956 A1Astron Aerospace LLC
- Rotary engine and cooling systems thereof13 Mar 2025US 2025/0084783 A1Pratt & Whitney Canada Corp.
- Seal assembly for a rotary engine housing16 Jan 2025US 2025/0020061 A1Pratt & Whitney Canada Corp.
Most cited
By later US patents
- Fluid-cooled, scroll-type, positive fluid displacement apparatus63US 3,986,799 AArthur D. Little, Inc. · 1976
- Rankine cycle device, expansion system and expansion machine41US 9,732,634 B2Panasonic Intellectual Property Management Co., Ltd. · 2017
- Elliptical rotary engine34US 6,776,136 B12004
- Hydrogen G-cycle rotary internal combustion engine29US 7,707,987 B2Prime Mover International, LLC · 2010
- Portable self-contained power and cooling system27US 5,228,309 AArthur D. Little, Inc. · 1993