F16L 23/14
For rectangular pipes
Official title: for rectangular pipes
F16L23/14 (For rectangular pipes) appears on 144 US grants and 78 published applications in this corpus.
Search patents in F16L- Granted patents
- 144
- Published applications
- 78
- Assignees
- 61
- Inventors
- 149
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 2 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 2 | 0 |
| 1981 | 6 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 3 | 0 |
| 1985 | 6 | 0 |
| 1986 | 6 | 0 |
| 1987 | 2 | 0 |
| 1988 | 4 | 0 |
| 1989 | 3 | 0 |
| 1990 | 1 | 0 |
| 1991 | 6 | 0 |
| 1992 | 4 | 0 |
| 1993 | 0 | 0 |
| 1994 | 8 | 0 |
| 1995 | 5 | 0 |
| 1996 | 1 | 0 |
| 1997 | 6 | 0 |
| 1998 | 0 | 0 |
| 1999 | 2 | 0 |
| 2000 | 2 | 0 |
| 2001 | 2 | 0 |
| 2002 | 2 | 1 |
| 2003 | 2 | 1 |
| 2004 | 1 | 2 |
| 2005 | 1 | 3 |
| 2006 | 2 | 3 |
| 2007 | 3 | 0 |
| 2008 | 1 | 5 |
| 2009 | 0 | 4 |
| 2010 | 3 | 2 |
| 2011 | 0 | 2 |
| 2012 | 2 | 4 |
| 2013 | 2 | 3 |
| 2014 | 3 | 5 |
| 2015 | 6 | 3 |
| 2016 | 1 | 9 |
| 2017 | 2 | 5 |
| 2018 | 5 | 7 |
| 2019 | 3 | 8 |
| 2020 | 12 | 5 |
| 2021 | 3 | 1 |
| 2022 | 2 | 3 |
| 2023 | 5 | 0 |
| 2024 | 1 | 2 |
| 2025 | 2 | 0 |
| 2026 | 4 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- System and method for forming a full engagement male lock in a ductline29 Sep 2026US 12,747,810 B2Mestek Machinery, Inc.
- System and method for forming a full engagement male lock in a ductline3 Mar 2026US 12,565,947 B2Mestek Machinery, Inc.
- System and method for joining and hanging ducts17 Feb 2026US 12,553,551 B2
- System and method for joining and hanging ducts20 Jan 2026US 12,529,437 B2H J Fischer, LLC
- Roller member for use in an apparatus for closing pittsburgh seams associated with duct assemblies and other box-shaped members21 Oct 2025US 12,449,157 B2Vicon Machinery LLC
- System and method for forming a full engagement male lock in a ductline5 Dec 2024US 2024/0401726 A1Mestek Machinery, Inc.
- System and method for joining and hanging ducts24 Oct 2024US 2024/0353037 A1
- Pre-fabricated modular fire-rated conduit assembly22 Dec 2022US 2022/0404063 A1Durasystems Barriers Inc.
- Roller member for use in an apparatus for closing pittsburgh seams associated with duct assemblies and other box-shaped members7 Jul 2022US 2022/0214074 A1Vicon Machinery LLC
- System and method for forming a full engagement male lock in a ductline6 Jan 2022US 2022/0003340 A1Mestek Machinery, Inc.
Most cited
By later US patents
- Duct connecting system67US 4,466,641 AIowa Precision Industries, Inc. · 1984
- Flange type duct joint assembly65US 4,218,079 ADuctmate Industries, Inc. · 1980
- Sealed lay-in conduit duct64US 4,077,434 AFederal Cartridge Company · 1978
- Duct unit for air-conditioner50US 6,957,670 B1Fuji Kuuchou Kougyou Co., Ltd. · 2005
- Apparatus for a fire-rated duct41US 7,195,290 B22007