B21C 37/26
Helically-ribbed tubes
Official title: helically-ribbed tubes
B21C37/26 (Helically-ribbed tubes) appears on 75 US grants and 31 published applications in this corpus.
Search patents in B21C- Granted patents
- 75
- Published applications
- 31
- Assignees
- 55
- Inventors
- 141
- Latest grant
- 24 Jan 2023
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 2 | 0 |
| 1978 | 9 | 0 |
| 1979 | 2 | 0 |
| 1980 | 5 | 0 |
| 1981 | 3 | 0 |
| 1982 | 3 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 3 | 0 |
| 1992 | 1 | 0 |
| 1993 | 3 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 4 | 0 |
| 1999 | 0 | 0 |
| 2000 | 3 | 0 |
| 2001 | 1 | 0 |
| 2002 | 3 | 1 |
| 2003 | 1 | 1 |
| 2004 | 2 | 0 |
| 2005 | 2 | 3 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 1 | 2 |
| 2009 | 0 | 3 |
| 2010 | 2 | 2 |
| 2011 | 0 | 2 |
| 2012 | 3 | 1 |
| 2013 | 0 | 2 |
| 2014 | 1 | 1 |
| 2015 | 1 | 0 |
| 2016 | 1 | 0 |
| 2017 | 0 | 1 |
| 2018 | 1 | 1 |
| 2019 | 0 | 2 |
| 2020 | 2 | 3 |
| 2021 | 3 | 1 |
| 2022 | 0 | 3 |
| 2023 | 1 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Cylindrical tube formation24 Jan 2023US 11,559,832 B2Keystone Tower Systems, Inc.
- Method and apparatus for forming a helical type flight2 Nov 2021US 11,161,162 B2Robo Helix Pty Limited
- Fin-assembled tube manufacturing method and double tube manufacturing method29 Jun 2021US 11,047,629 B2Marelli Cabin Comfort Japan Corporation
- Fin-assembled tube23 Mar 2021US 10,955,198 B2Marelli Cabin Comfort Japan Corporation
- Cylindrical tube formation21 Jul 2020US 10,717,122 B2Keystone Tower Systems, Inc.
- Spiral tube5 Jan 2023US 2023/0001464 A1Posco
- Heat transfer equipment10 Nov 2022US 2022/0357113 A1
- Finned tube and method of manufacturing the same6 Oct 2022US 2022/0316824 A1SchmöLe GmbH
- Method and apparatus for manufacturing finned tubes2 Jun 2022US 2022/0168844 A1SchmöLe GmbH
- Method and apparatus for making fin tube20 May 2021US 2021/0146419 A1
Most cited
By later US patents
- Method for making heat pipes21US 5,564,184 AHeat Pipe Technology, Inc. · 1996
- Finned tube useful for heat exchangers18US 4,224,984 ASharp Kabushiki Kaisha · 1980
- Looped fin heat exchanger and method for making same16US 5,033,544 A1991
- Method and apparatus for making a looped fin heat exchanger15US 5,022,149 A1991
- Method for the manufacture of thin-walled metal tubes14US 4,251,907 A1981