F16D 21/08
Serially-arranged clutches interconnecting two shafts only when all the clutches are engaged
Official title: Serially-arranged clutches interconnecting two shafts only when all the clutches are engaged (F16D13/08, F16D13/12 take precedence)
F16D21/08 (Serially-arranged clutches interconnecting two shafts only when all the clutches are engaged) appears on 93 US grants and 74 published applications in this corpus.
Search patents in F16D- Granted patents
- 93
- Published applications
- 74
- Assignees
- 57
- Inventors
- 199
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 3 | 0 |
| 1983 | 3 | 0 |
| 1984 | 4 | 0 |
| 1985 | 1 | 0 |
| 1986 | 2 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 2 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 2 | 1 |
| 2004 | 1 | 1 |
| 2005 | 0 | 0 |
| 2006 | 1 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 3 |
| 2009 | 0 | 0 |
| 2010 | 1 | 1 |
| 2011 | 0 | 2 |
| 2012 | 1 | 1 |
| 2013 | 4 | 3 |
| 2014 | 3 | 5 |
| 2015 | 3 | 3 |
| 2016 | 5 | 5 |
| 2017 | 0 | 1 |
| 2018 | 4 | 9 |
| 2019 | 7 | 7 |
| 2020 | 8 | 11 |
| 2021 | 9 | 5 |
| 2022 | 6 | 0 |
| 2023 | 3 | 5 |
| 2024 | 5 | 9 |
| 2025 | 7 | 1 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Clutch guard6 Oct 2026US 12,753,805 B2Arctic Cat Inc.
- Methods and systems of a two speed countershaft transmission7 Oct 2025US 12,435,773 B2Dana Belgium N.V.
- Booster clutch with a rotational axis for a drive train24 Jun 2025US 12,338,862 B2Schaeffler Technologies AG & Co. KG
- Drive mechanism for a four wheel drive electrified vehicle17 Jun 2025US 12,331,793 B2Deere & Company
- Double clutch assembly of electric driving apparatus for vehicle and electric driving apparatus including same25 Mar 2025US 12,259,011 B2Erae Ams Co., Ltd.
- Clutch guard25 Dec 2025US 2025/0389301 A1Arctic Cat Inc.
- Methods and systems of a two speed countershaft transmission19 Dec 2024US 2024/0418243 A1Dana Belgium N.V.
- Booster clutch with a rotational axis for a drive train14 Nov 2024US 2024/0376940 A1Schaeffler Technologies AG & Co. KG
- Multi-pack clutch assembly with actuator7 Nov 2024US 2024/0369111 A1Dana Belgium N.V.
- Hybrid Drive System for a Motor Vehicle10 Oct 2024US 2024/0336126 A1Mercedes-Benz Group AG
Most cited
By later US patents
- Multi-speed transmission with a series disconnect clutch87US 8,939,863 B2GM Global Technology Operations LLC · 2015
- Apparatus for operating a motor vehicle52US 4,346,773 AVolkswagenwerk Aktiengesellschaft · 1982
- Main clutch connecting system having a pilot clutch44US 5,464,084 AHonda Giken Kogyo Kabushiki Kaisha · 1995
- Go-cart41US 4,682,668 A1987
- Bi-directional overrunning clutch for a primary drive axle35US 6,722,484 B2The Hilliard Corporation · 2004