F16L 9/003
Rigid pipes: with a rectangular cross-section
Official title: {with a rectangular cross-section (ducting arrangements in air-conditioning or ventilation F24F13/02)}
F16L9/003 (Rigid pipes: with a rectangular cross-section) appears on 137 US grants and 130 published applications in this corpus.
Search patents in F16L- Granted patents
- 137
- Published applications
- 130
- Assignees
- 104
- Inventors
- 273
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 3 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 1 | 0 |
| 1995 | 3 | 0 |
| 1996 | 3 | 0 |
| 1997 | 4 | 0 |
| 1998 | 3 | 0 |
| 1999 | 3 | 0 |
| 2000 | 0 | 0 |
| 2001 | 5 | 1 |
| 2002 | 1 | 7 |
| 2003 | 2 | 4 |
| 2004 | 6 | 4 |
| 2005 | 3 | 7 |
| 2006 | 5 | 4 |
| 2007 | 0 | 2 |
| 2008 | 2 | 5 |
| 2009 | 1 | 3 |
| 2010 | 3 | 6 |
| 2011 | 0 | 2 |
| 2012 | 3 | 3 |
| 2013 | 5 | 5 |
| 2014 | 6 | 9 |
| 2015 | 3 | 6 |
| 2016 | 4 | 8 |
| 2017 | 7 | 7 |
| 2018 | 8 | 5 |
| 2019 | 7 | 9 |
| 2020 | 6 | 7 |
| 2021 | 1 | 2 |
| 2022 | 6 | 7 |
| 2023 | 7 | 4 |
| 2024 | 3 | 6 |
| 2025 | 7 | 4 |
| 2026 | 4 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Conversion pipe arrangement, substrate processing apparatus, method of processing substrate, and method of manufacturing semiconductor device3 Feb 2026US 12,540,695 B2Kokusai Electric Corporation
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- Forming device, forming system, and metal pipe28 May 2026US 2026/0145217 A1Sumitomo Heavy Industries, Ltd.
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- Waterway installation structure in a toilet11 Sep 2025US 2025/0283319 A1Shanghai Kohler Electronics, Ltd.
- Operative connection device3 Jul 2025US 2025/0216003 A1Teseo S.R.L.
Most cited
By later US patents
- Air duct and method of making same83US 5,918,644 A1999
- Apparatus for on-site installation of air duct system78US 6,231,704 B12001
- Plastic self-insulating ductwork system69US 5,219,403 A1993
- Sealed lay-in conduit duct64US 4,077,434 AFederal Cartridge Company · 1978
- Clear tube section for pneumatic transport tube system64US 5,473,114 AMosler, Inc. · 1995