F28F 1/02
Tubular elements of cross-section which is non-circular
Official title: Tubular elements of cross-section which is non-circular (F28F1/08, F28F1/10 take precedence)
F28F1/02 (Tubular elements of cross-section which is non-circular) appears on 1,258 US grants and 1,750 published applications in this corpus.
Search patents in F28F- Granted patents
- 1,258
- Published applications
- 1,750
- Assignees
- 647
- Inventors
- 3,547
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 7 | 0 |
| 1978 | 3 | 0 |
| 1979 | 4 | 0 |
| 1980 | 13 | 0 |
| 1981 | 4 | 0 |
| 1982 | 14 | 0 |
| 1983 | 3 | 0 |
| 1984 | 11 | 0 |
| 1985 | 6 | 0 |
| 1986 | 10 | 0 |
| 1987 | 6 | 0 |
| 1988 | 7 | 0 |
| 1989 | 8 | 0 |
| 1990 | 6 | 0 |
| 1991 | 15 | 0 |
| 1992 | 11 | 0 |
| 1993 | 13 | 0 |
| 1994 | 18 | 0 |
| 1995 | 9 | 0 |
| 1996 | 15 | 0 |
| 1997 | 9 | 0 |
| 1998 | 15 | 0 |
| 1999 | 14 | 0 |
| 2000 | 11 | 0 |
| 2001 | 18 | 9 |
| 2002 | 17 | 34 |
| 2003 | 22 | 25 |
| 2004 | 12 | 45 |
| 2005 | 26 | 43 |
| 2006 | 31 | 43 |
| 2007 | 14 | 43 |
| 2008 | 12 | 47 |
| 2009 | 14 | 49 |
| 2010 | 18 | 62 |
| 2011 | 15 | 53 |
| 2012 | 18 | 32 |
| 2013 | 22 | 64 |
| 2014 | 27 | 76 |
| 2015 | 30 | 66 |
| 2016 | 30 | 74 |
| 2017 | 53 | 109 |
| 2018 | 57 | 104 |
| 2019 | 93 | 108 |
| 2020 | 67 | 109 |
| 2021 | 76 | 116 |
| 2022 | 81 | 98 |
| 2023 | 78 | 98 |
| 2024 | 73 | 101 |
| 2025 | 84 | 75 |
| 2026 | 35 | 67 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Condensation dedust-demister set6 Oct 2026US 12,752,224 B2
- Heat exchanger with tube bundle comprising at least two sections15 Sep 2026US 12,736,288 B2Valmex S.P.A.
- Plate with flow channel1 Sep 2026US 12,723,816 B2NHK Spring Co., Ltd.
- Water tank assembly for heating device, and heating device25 Aug 2026US 12,716,614 B2Wuhu Midea Kitchen and Bath Appliances Mfg. Co., Ltd.
- Evaporator with orifice insert25 Aug 2026US 12,716,660 B2Hamilton Sundstrand Corporation
- Highly efficient and economical fluid flat tube structure24 Sep 2026US 2026/0287092 A1
- Heat exchanger24 Sep 2026US 2026/0287275 A1Daikin Industries, Ltd.
- Secondarily applied cold side features for cast heat exchanger24 Sep 2026US 2026/0287277 A1Rtx Corporation
- Fin and heat exchanger10 Sep 2026US 2026/0266564 A1Zhejiang Dunan Artificial Environment Co., Ltd.
- Heat exchanger and air conditioner employing the same10 Sep 2026US 2026/0266565 A1Samsung Electronics Co., Ltd.
Most cited
By later US patents
- Inline heat exchanger and cardioplegia system184US 5,403,281 AMinnesota Mining and Manufacturing Company · 1995
- Compact vacuum insulation176US 5,157,893 AMidwest Research Institute · 1992
- Compact vacuum insulation174US 5,175,975 AMidwest Research Institute · 1993
- Heat exchanger141US 6,964,296 B2Modine Manufacturing Company · 2005
- Blood oxygenator with integral heat exchanger for regulating the temperature of blood in an extracorporeal circuit119US 4,065,264 AShiley Laboratories, Inc. · 1977