Upper and lower limit detecting apparatus and method for electric chain block
US-12460980-B2 · Nov 4, 2025 · US
with variable-speed gearings between driving motor and drum or barrel
with variable-speed gearings between driving motor and drum or barrel · Cooperative Patent Classification (CPC)
Separating, mixing, shaping, printing, and transporting materials.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | B66D3/22 |
| Official title | with variable-speed gearings between driving motor and drum or barrel |
| Display label | with variable-speed gearings between driving motor and drum or barrel |
| Total patents | 32 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2016 | 2 |
| 2017 | 4 |
| 2018 | 6 |
| 2019 | 4 |
| 2020 | 6 |
| 2021 | 5 |
| 2023 | 2 |
| 2024 | 1 |
| 2025 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Method for testing the operation of a next generation rescue hoist
US-12460996-B2 · Nov 4, 2025 · US
Upper and lower limit detecting apparatus and method for electric chain block
US-2024035907-A1 · Feb 1, 2024 · US
Method for testing the operation of a next generation rescue hoist
US-2023393025-A1 · Dec 7, 2023 · US
Power transmission system
US-11661194-B2 · May 30, 2023 · US
Overload clutch assembly for hoist
US-11078058-B2 · Aug 3, 2021 · US
Rescue hoist cooling system
US-10961090-B2 · Mar 30, 2021 · US
Auxiliary brake assembly
US-10947094-B2 · Mar 16, 2021 · US
Auxiliary brake assembly
US-2021039928-A1 · Feb 11, 2021 · US
Rescue hoist cooling system
US-2021039927-A1 · Feb 11, 2021 · US
Overload clutch assembly for hoist
US-2020307971-A1 · Oct 1, 2020 · US
Chain block and built-in cover
US-10787348-B2 · Sep 29, 2020 · US
Power transmission system
US-2020290851-A1 · Sep 17, 2020 · US
Coaxial hoist geartrain cartridge
US-10752478-B2 · Aug 25, 2020 · US
Systems, devices, and methods for monitoring object locations
US-10664704-B2 · May 26, 2020 · US
Rope hoist
US-10549958-B2 · Feb 4, 2020 · US
Drawworks systems and methods
US-10464791-B2 · Nov 5, 2019 · US
Rope hoist
US-10351398-B2 · Jul 16, 2019 · US
Rope hoist
US-10273128-B2 · Apr 30, 2019 · US
Swivel winch rotated via an actuator in response to pressure sensor data
US-10173870-B1 · Jan 8, 2019 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC B66D3/22?
- CPC B66D3/22 is the Cooperative Patent Classification code for “with variable-speed gearings between driving motor and drum or barrel.”
- How many patents are filed under CPC B66D3/22 (with variable-speed gearings between driving motor and drum or barrel)?
- Our database includes 32 publications tagged with this CPC code.
- Is patent activity under CPC B66D3/22 growing?
- Publication counts under this code: 1 in 2024 vs 2 in 2025 (latest complete years).