F16D 35/021
Actuated by valves
Official title: {actuated by valves}
F16D35/021 (Actuated by valves) appears on 381 US grants and 137 published applications in this corpus.
Search patents in F16D- Granted patents
- 381
- Published applications
- 137
- Assignees
- 73
- Inventors
- 295
- Latest grant
- 9 Sep 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 8 | 0 |
| 1977 | 11 | 0 |
| 1978 | 9 | 0 |
| 1979 | 4 | 0 |
| 1980 | 8 | 0 |
| 1981 | 14 | 0 |
| 1982 | 9 | 0 |
| 1983 | 8 | 0 |
| 1984 | 15 | 0 |
| 1985 | 7 | 0 |
| 1986 | 15 | 0 |
| 1987 | 20 | 0 |
| 1988 | 7 | 0 |
| 1989 | 10 | 0 |
| 1990 | 29 | 0 |
| 1991 | 13 | 0 |
| 1992 | 14 | 0 |
| 1993 | 7 | 0 |
| 1994 | 2 | 0 |
| 1995 | 5 | 0 |
| 1996 | 13 | 0 |
| 1997 | 4 | 0 |
| 1998 | 6 | 0 |
| 1999 | 8 | 0 |
| 2000 | 7 | 0 |
| 2001 | 4 | 2 |
| 2002 | 4 | 4 |
| 2003 | 3 | 4 |
| 2004 | 5 | 6 |
| 2005 | 3 | 5 |
| 2006 | 3 | 10 |
| 2007 | 4 | 6 |
| 2008 | 6 | 8 |
| 2009 | 6 | 5 |
| 2010 | 3 | 5 |
| 2011 | 9 | 4 |
| 2012 | 3 | 2 |
| 2013 | 3 | 3 |
| 2014 | 6 | 4 |
| 2015 | 4 | 12 |
| 2016 | 11 | 15 |
| 2017 | 8 | 7 |
| 2018 | 3 | 9 |
| 2019 | 4 | 12 |
| 2020 | 20 | 4 |
| 2021 | 5 | 4 |
| 2022 | 4 | 2 |
| 2023 | 4 | 2 |
| 2024 | 2 | 0 |
| 2025 | 1 | 1 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Viscous clutch with front-mounted electromagnetic coil, modular valve and front hub subassemblies for a viscous clutch, and method of making9 Sep 2025US 12,410,836 B2Horton, Inc.
- Electronically controlled viscous coupler for combine harvester26 Nov 2024US 12,150,412 B2CNH Industrial America LLC
- Valve control system for viscous friction clutch16 Jan 2024US 11,873,868 B2Horton, Inc.
- Controller of fan coupling device25 Apr 2023US 11,635,085 B2Toyota Jidosha Kabushiki Kaisha
- Clutch assembly and integrated ARB/guard25 Apr 2023US 11,635,113 B2Horton, Inc.
- Resilient dust cover for fan clutch assembly30 Jul 2026US 2026/0218760 A1Volvo Truck Corporation
- Viscous clutch with front-mounted electromagnetic coil, modular valve and front hub subassemblies for a viscous clutch, and method of making12 Jun 2025US 2025/0188999 A1Horton, Inc.
- Valve Control System for Viscous Friction Clutch6 Jul 2023US 2023/0213072 A1Horton, Inc.
- Clutch Assembly and Integrated ARB/Guard12 Jan 2023US 2023/0010456 A1Horton, Inc.
- Electronically controlled viscous coupler for combine harvester3 Nov 2022US 2022/0348412 A1CNH Industrial America LLC
Most cited
By later US patents
- Automatic control valves579US 4,176,630 ADynair Limited · 1979
- Fluid coupling device having improved response time49US 4,281,750 AEaton Corporation · 1981
- Magnetically actuated viscous fluid coupling46US 4,056,178 AEaton Corporation · 1977
- Fan drive hydraulic coupling43US 3,964,582 AWallace Murray Corporation · 1976
- Viscous driven overrunning clutch42US 4,046,239 AEaton Corporation · 1977