CDA lifter with hydraulic control feed from outside the engine block
US-12326102-B2 · Jun 10, 2025 · US
Hydraulic tappets
Hydraulic tappets · 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 | F01L1/245 |
| Official title | Hydraulic tappets |
| Display label | Hydraulic tappets |
| Total patents | 61 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2015 | 1 |
| 2016 | 7 |
| 2017 | 11 |
| 2018 | 8 |
| 2019 | 9 |
| 2020 | 11 |
| 2021 | 5 |
| 2022 | 4 |
| 2023 | 2 |
| 2024 | 1 |
| 2025 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Rocker arm mechanism and engine assembly
US-11891924-B2 · Feb 6, 2024 · US
HLA arrangement using cold formed plunger and manufacturing simplifications
US-11846211-B2 · Dec 19, 2023 · US
Rocker arm mechanism and engine assembly
US-2023332520-A1 · Oct 19, 2023 · US
Reciprocating-piston machine
US-11466596-B2 · Oct 11, 2022 · US
Hydraulic support element
US-11459915-B2 · Oct 4, 2022 · US
Hla arrangement using cold formed plunger & manufacturing simplifications
US-2022290586-A1 · Sep 15, 2022 · US
Rocker based bleeder engine brake
US-11401839-B2 · Aug 2, 2022 · US
Tappet
US-11208923-B2 · Dec 28, 2021 · US
Tappet
US-2021310381-A1 · Oct 7, 2021 · US
Cylinder head
US-11092044-B2 · Aug 17, 2021 · US
Rocker based bleeder engine brake
US-2021131315-A1 · May 6, 2021 · US
Gasoline engine knock control
US-10947912-B2 · Mar 16, 2021 · US
Tappet
US-10876441-B2 · Dec 29, 2020 · US
Anti-rotation feature for followers using an oil gallery insert
US-10865662-B2 · Dec 15, 2020 · US
Cylinder head
US-2020378279-A1 · Dec 3, 2020 · US
Tappet
US-10794236-B2 · Oct 6, 2020 · US
Sliding spring contacts providing electrical power to rocker arms
US-10731516-B2 · Aug 4, 2020 · US
Tappet
US-2020232351-A1 · Jul 23, 2020 · US
Hydraulic support element
US-2020123936-A1 · Apr 23, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F01L1/245?
- CPC F01L1/245 is the Cooperative Patent Classification code for “Hydraulic tappets.”
- How many patents are filed under CPC F01L1/245 (Hydraulic tappets)?
- Our database includes 61 publications tagged with this CPC code.
- Is patent activity under CPC F01L1/245 growing?
- Publication counts under this code: 1 in 2024 vs 2 in 2025 (latest complete years).