F16L 9/18
Double-walled pipes
Official title: Double-walled pipes; Multi-channel pipes or pipe assemblies
F16L9/18 (Double-walled pipes) appears on 645 US grants and 652 published applications in this corpus.
Search patents in F16L- Granted patents
- 645
- Published applications
- 652
- Assignees
- 471
- Inventors
- 1,404
- Latest grant
- 4 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 13 | 0 |
| 1977 | 3 | 0 |
| 1978 | 4 | 0 |
| 1979 | 4 | 0 |
| 1980 | 5 | 0 |
| 1981 | 14 | 0 |
| 1982 | 4 | 0 |
| 1983 | 4 | 0 |
| 1984 | 6 | 0 |
| 1985 | 4 | 0 |
| 1986 | 3 | 0 |
| 1987 | 7 | 0 |
| 1988 | 5 | 0 |
| 1989 | 3 | 0 |
| 1990 | 8 | 0 |
| 1991 | 4 | 0 |
| 1992 | 6 | 0 |
| 1993 | 3 | 0 |
| 1994 | 5 | 0 |
| 1995 | 9 | 0 |
| 1996 | 8 | 0 |
| 1997 | 3 | 0 |
| 1998 | 17 | 0 |
| 1999 | 9 | 0 |
| 2000 | 10 | 0 |
| 2001 | 8 | 8 |
| 2002 | 13 | 17 |
| 2003 | 14 | 14 |
| 2004 | 12 | 19 |
| 2005 | 12 | 24 |
| 2006 | 10 | 21 |
| 2007 | 8 | 15 |
| 2008 | 7 | 15 |
| 2009 | 4 | 15 |
| 2010 | 13 | 24 |
| 2011 | 10 | 20 |
| 2012 | 11 | 15 |
| 2013 | 14 | 37 |
| 2014 | 26 | 33 |
| 2015 | 24 | 36 |
| 2016 | 21 | 33 |
| 2017 | 30 | 38 |
| 2018 | 23 | 30 |
| 2019 | 41 | 30 |
| 2020 | 32 | 45 |
| 2021 | 39 | 39 |
| 2022 | 33 | 32 |
| 2023 | 18 | 25 |
| 2024 | 24 | 31 |
| 2025 | 21 | 18 |
| 2026 | 16 | 18 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Testable termination fitting4 Aug 2026US 12,698,860 B2Franklin Fueling Systems, Inc.
- Manufacture of pipe-in-pipe assemblies28 Jul 2026US 12,692,969 B2Acergy France SAS
- Device and system for monitoring the conditions of a thermal fluid, and method for said monitoring28 Jul 2026US 12,693,045 B2Rioglass Solar Sch, S.L.
- Vacuum-insulated double-wall piping for transporting cryogenic fluid9 Jun 2026US 12,650,197 B2Tb Global Technologies Ltd.
- Multi-layered nuclear fuel cladding and method for manufacturing multi-layered nuclear fuel cladding9 Jun 2026US 12,651,673 B2Gachon University of Industry-Academic Cooperation Foundation
- Fluid transport pipe10 Sep 2026US 2026/0266401 A1LG Energy Solution, Ltd.
- Pipe for the transfer of cryogenic fluid10 Sep 2026US 2026/0266409 A1L' Air Liquide, Societe Anonyme pour I' Etude et I'Exploitation des Procedes Georges Claude
- Fluid transport pipe3 Sep 2026US 2026/0258885 A1LG Energy Solution, Ltd.
- Centralisers for pipeline assemblies3 Sep 2026US 2026/0258886 A1Acergy France SAS
- Composite tube13 Aug 2026US 2026/0233491 A1Nippon Steel Corporation
Most cited
By later US patents
- Arrangement in a pipe bundle581US 5,979,506 AAker Engineering AS · 1999
- Dual wall safety tube580US 4,653,541 AParker-Hannifin Corporation · 1987
- Method of making a kink-resistant catheter405US 6,702,972 B1Diametrics Medical, Inc. · 2004
- Apparatus and method for preventing and treating cellulite216US 6,443,914 B1Lysonix, Inc. · 2002
- Composite spoolable tube179US 5,921,285 AFiberspar Spoolable Products, Inc. · 1999