Internal floating piston
US-2025376994-A1 · Dec 11, 2025 · US
Sealings therefor, e.g. piston rings
Sealings therefor, e.g. piston rings · 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 | F15B2201/312 |
| Official title | Sealings therefor, e.g. piston rings |
| Display label | Sealings therefor, e.g. piston rings |
| Total patents | 30 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly growing.
| Year | Patents |
|---|---|
| 2015 | 1 |
| 2017 | 2 |
| 2018 | 1 |
| 2019 | 4 |
| 2020 | 4 |
| 2021 | 1 |
| 2022 | 3 |
| 2023 | 4 |
| 2024 | 1 |
| 2025 | 9 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Pressure applying device
US-12480536-B2 · Nov 25, 2025 · US
Pressure applying device
US-2025347300-A1 · Nov 13, 2025 · US
Internal floating piston
US-12429074-B2 · Sep 30, 2025 · US
Piston Accumulator
US-2025198427-A1 · Jun 19, 2025 · US
Accumulator piston device
US-12257989-B2 · Mar 25, 2025 · US
Hydraulic Accumulator
US-2025092885-A1 · Mar 20, 2025 · US
Internal floating piston
US-2025084876-A1 · Mar 13, 2025 · US
Piston accumulator
US-12241482-B2 · Mar 4, 2025 · US
Accumulator Piston Device
US-2024239325-A1 · Jul 18, 2024 · US
Spring dampening for accumulator system
US-2023287905-A1 · Sep 14, 2023 · US
Pressure compensation device designed for underwater applications
US-11674529-B2 · Jun 13, 2023 · US
Piston accumulator
US-2023090796-A1 · Mar 23, 2023 · US
Piston accumulator
US-11542962-B2 · Jan 3, 2023 · US
Piston accumulator
US-2022372996-A1 · Nov 24, 2022 · US
High-capacity bladder type constant pressure accumulator and application thereof
US-2022178388-A1 · Jun 9, 2022 · US
Accumulator module for hydromechanical spring-loaded drive
US-11286959-B2 · Mar 29, 2022 · US
Sealing structure
US-10900568-B2 · Jan 26, 2021 · US
Piston accumulator
US-2020362883-A1 · Nov 19, 2020 · US
Hydraulic block for a hydraulic assembly of a brake control system of a hydraulic vehicle brake system
US-10814848-B2 · Oct 27, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F15B2201/312?
- CPC F15B2201/312 is the Cooperative Patent Classification code for “Sealings therefor, e.g. piston rings.”
- How many patents are filed under CPC F15B2201/312 (Sealings therefor, e.g. piston rings)?
- Our database includes 30 publications tagged with this CPC code.
- Is patent activity under CPC F15B2201/312 growing?
- Publication counts under this code: 1 in 2024 vs 9 in 2025 (latest complete years).