Power transmission device
US-11073184-B2 · Jul 27, 2021 · US
Serially-arranged clutches interconnecting two shafts only when all the clutches are engaged (F16D13/08, F16D13/12 take precedence)
Serially-arranged clutches interconnecting two shafts only when all the clutches are engaged (F16D13/08, F16D13/12 take precedence) · Cooperative Patent Classification (CPC)
Engines, pumps, lighting, heating, and mechanical systems.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | F16D21/08 |
| Official title | Serially-arranged clutches interconnecting two shafts only when all the clutches are engaged (F16D13/08, F16D13/12 take precedence) |
| Display label | Serially-arranged clutches interconnecting two shafts only when all the clutches are engaged (F16D13/08, F16D13/12 take precedence) |
| Total patents | 101 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 4 |
| 2016 | 11 |
| 2017 | 1 |
| 2018 | 12 |
| 2019 | 12 |
| 2020 | 17 |
| 2021 | 14 |
| 2022 | 8 |
| 2023 | 6 |
| 2024 | 9 |
| 2025 | 7 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Shifting system including a shifting assembly and method of operating the same
US-2021172482-A1 · Jun 10, 2021 · US
Clutch system
US-10948029-B2 · Mar 16, 2021 · US
Clutch arrangement and drive train for a motor vehicle
US-10850604-B2 · Dec 1, 2020 · US
Bi-directional integrated starter-generator device
US-2020332864-A1 · Oct 22, 2020 · US
Impact tool
US-10807224-B2 · Oct 20, 2020 · US
Axle assembly having a wheel end disconnect and method of control
US-10801556-B2 · Oct 13, 2020 · US
Hybrid module including torque converter having a stator friction brake
US-10792991-B2 · Oct 6, 2020 · US
Clutch System
US-2020292011-A1 · Sep 17, 2020 · US
Hybrid module
US-10737567-B2 · Aug 11, 2020 · US
Clutch device for a hybrid drive system
US-10723215-B2 · Jul 28, 2020 · US
Power Transmission Device
US-2020232520-A1 · Jul 23, 2020 · US
Hybrid module having a rotary feedthrough
US-2020215897-A1 · Jul 9, 2020 · US
Hybrid vehicle drive apparatus
US-10704614-B2 · Jul 7, 2020 · US
Power Transmission Device
US-2020200226-A1 · Jun 25, 2020 · US
Hybrid module including torque converter having a stator friction clutch
US-2020180422-A1 · Jun 11, 2020 · US
Hybrid module
US-2020171933-A1 · Jun 4, 2020 · US
Four-wheel drive vehicle
US-2020094674-A1 · Mar 26, 2020 · US
Compact electric machine with combined rotor carrier and clutch housing
US-2020083780-A1 · Mar 12, 2020 · US
Four-wheel-drive vehicle and method of controlling four-wheel-drive vehicle
US-10549633-B2 · Feb 4, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F16D21/08?
- CPC F16D21/08 is the Cooperative Patent Classification code for “Serially-arranged clutches interconnecting two shafts only when all the clutches are engaged (F16D13/08, F16D13/12 take precedence).”
- How many patents are filed under CPC F16D21/08 (Serially-arranged clutches interconnecting two shafts only when all the clutches are engaged (F16D13/08, F16D13/12 take precedence))?
- Our database includes 101 publications tagged with this CPC code.
- Is patent activity under CPC F16D21/08 growing?
- Publication counts under this code: 9 in 2024 vs 7 in 2025 (latest complete years).