Piston ring having a stepped running surface
US-11187322-B2 · Nov 30, 2021 · US
of non-metals
of non-metals · 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 | F16J9/28 |
| Official title | of non-metals |
| Display label | of non-metals |
| Total patents | 96 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 4 |
| 2016 | 14 |
| 2017 | 13 |
| 2018 | 8 |
| 2019 | 8 |
| 2020 | 6 |
| 2021 | 8 |
| 2022 | 8 |
| 2023 | 10 |
| 2024 | 3 |
| 2025 | 11 |
| 2026 | 3 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Piston assembly for human-powered vehicle
US-2021362802-A1 · Nov 25, 2021 · US
Sliding element for internal combustion engines
US-11143302-B2 · Oct 12, 2021 · US
Piston ring
US-2021270370-A1 · Sep 2, 2021 · US
Seal structure for fluid pressure device
US-2021262572-A1 · Aug 26, 2021 · US
Piston ring and compressor
US-2021156371-A1 · May 27, 2021 · US
Hydraulic tool mount and sealing piston for such a mount
US-2021108728-A1 · Apr 15, 2021 · US
Compressor
US-2020408302-A1 · Dec 31, 2020 · US
Reinforced sealing rings
US-2020362966-A1 · Nov 19, 2020 · US
Piston ring, reciprocating compressor, method for selecting piston ring and method for evaluating life of piston ring
US-2020340582-A1 · Oct 29, 2020 · US
Reinforced sealing rings
US-10731759-B2 · Aug 4, 2020 · US
Using Silicone O-Rings in Dual Action Irrigation Pump
US-2020208627-A1 · Jul 2, 2020 · US
Osmotic delivery systems and piston assemblies for use therein
US-10527170-B2 · Jan 7, 2020 · US
Piston ring having a stepped running surface
US-2019346043-A1 · Nov 14, 2019 · US
Sliding member and method for producing same
US-10451184-B2 · Oct 22, 2019 · US
Sliding element
US-10400895-B2 · Sep 3, 2019 · US
Method for producing piston a ring
US-10370755-B2 · Aug 6, 2019 · US
Highly heat conductive piston ring for internal combustion engine
US-10344860-B2 · Jul 9, 2019 · US
Ti—Si—C—N piston ring coatings
US-10316970-B2 · Jun 11, 2019 · US
Sliding element for internal combustion engines
US-2019154153-A1 · May 23, 2019 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F16J9/28?
- CPC F16J9/28 is the Cooperative Patent Classification code for “of non-metals.”
- How many patents are filed under CPC F16J9/28 (of non-metals)?
- Our database includes 96 publications tagged with this CPC code.
- Is patent activity under CPC F16J9/28 growing?
- Publication counts under this code: 3 in 2024 vs 11 in 2025 (latest complete years).