Piston seal ring
US-12571472-B2 · Mar 10, 2026 · US
with expansion obtained by pressure of the medium
with expansion obtained by pressure of the medium · 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 | F16J9/08 |
| Official title | with expansion obtained by pressure of the medium |
| Display label | with expansion obtained by pressure of the medium |
| Total patents | 55 |
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 | 6 |
| 2016 | 9 |
| 2017 | 6 |
| 2018 | 5 |
| 2019 | 5 |
| 2020 | 7 |
| 2021 | 4 |
| 2022 | 7 |
| 2024 | 3 |
| 2025 | 2 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Pressure boosting pump and hydrogen supply system
US-2025383047-A1 · Dec 18, 2025 · US
Anti-friction sealing rings
US-2025092951-A1 · Mar 20, 2025 · US
Metal sealing ring and method of forming a metal-to-metal seal
US-11946547-B2 · Apr 2, 2024 · US
Open-faced piston assembly
US-11946435-B2 · Apr 2, 2024 · US
Piston Seal Ring
US-2024077031-A1 · Mar 7, 2024 · US
Open-faced piston assembly
US-2022260034-A1 · Aug 18, 2022 · US
Metal sealing ring and method of forming a metal-to-metal seal
US-2022243816-A1 · Aug 4, 2022 · US
Flutter-suppression piston ring
US-11371610-B2 · Jun 28, 2022 · US
Piston ring unit and compressor
US-2022196151-A1 · Jun 23, 2022 · US
Piston ring and compressor
US-11346332-B2 · May 31, 2022 · US
Open-faced piston assembly
US-11313318-B2 · Apr 26, 2022 · US
Joining support jig
US-11287038-B2 · Mar 29, 2022 · US
Piston ring having a stepped running surface
US-11187322-B2 · Nov 30, 2021 · US
Joining support jig
US-2021285543-A1 · Sep 16, 2021 · US
Piston for an internal combustion engine
US-11054030-B2 · Jul 6, 2021 · US
Piston ring and compressor
US-2021156371-A1 · May 27, 2021 · US
Piston for an internal combustion engine
US-2020300361-A1 · Sep 24, 2020 · US
Open-faced piston assembly
US-2020271071-A1 · Aug 27, 2020 · US
Piston ring, piston assembly including piston ring, and methods of manufacturing
US-2020191269-A1 · Jun 18, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F16J9/08?
- CPC F16J9/08 is the Cooperative Patent Classification code for “with expansion obtained by pressure of the medium.”
- How many patents are filed under CPC F16J9/08 (with expansion obtained by pressure of the medium)?
- Our database includes 55 publications tagged with this CPC code.
- Is patent activity under CPC F16J9/08 growing?
- Publication counts under this code: 3 in 2024 vs 2 in 2025 (latest complete years).