Methods for reducing oil sticking on surfaces of internal combustion engines
US-2020400094-A1 · Dec 24, 2020 · US
Valve-seats not provided for in preceding subgroups of this group; Fixing of valve-seats
Valve-seats not provided for in preceding subgroups of this group; Fixing of valve-seats · 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 | F01L3/22 |
| Official title | Valve-seats not provided for in preceding subgroups of this group; Fixing of valve-seats |
| Display label | Valve-seats not provided for in preceding subgroups of this group; Fixing of valve-seats |
| Total patents | 109 |
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 | 5 |
| 2016 | 9 |
| 2017 | 6 |
| 2018 | 7 |
| 2019 | 12 |
| 2020 | 25 |
| 2021 | 25 |
| 2022 | 7 |
| 2023 | 3 |
| 2024 | 7 |
| 2025 | 1 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Engine and gas exchange valve with under-head fillet contoured for chordal stress mitigation
US-10844758-B2 · Nov 24, 2020 · US
Double-crowned valve seat insert having seating surface formed of hard-facing material
US-2020340593-A1 · Oct 29, 2020 · US
Intake port structure for internal combustion engine
US-10815872-B2 · Oct 27, 2020 · US
System and method for valve seat injection
US-10808650-B2 · Oct 20, 2020 · US
Reduced-weight value spring collar
US-10794241-B2 · Oct 6, 2020 · US
Intake port structure for internal combustion engine
US-10767551-B2 · Sep 8, 2020 · US
Valve seat insert for long life natural gas lean burn engines
US-10767520-B1 · Sep 8, 2020 · US
Cylinder head for internal combustion engine
US-10731597-B2 · Aug 4, 2020 · US
Valve seat insert for internal combustion engine profiled to resist valve recession
US-10731523-B2 · Aug 4, 2020 · US
Engine and gas exchange valve with under-head fillet contoured for chordal stress mitigation
US-2020232353-A1 · Jul 23, 2020 · US
Internal combustion engine with at least one hollow-head valve
US-2020232354-A1 · Jul 23, 2020 · US
Cylinder head assembly having a hybrid valve seat insert
US-2020173317-A1 · Jun 4, 2020 · US
Internal combustion engine having a valve actuation device
US-10669900-B2 · Jun 2, 2020 · US
Valve seat insert for internal combustion engine profiled to resist valve recession
US-2020149440-A1 · May 14, 2020 · US
Valve seat insert for engine having double-crowned seating surface profiled for limiting valve recession
US-2020149441-A1 · May 14, 2020 · US
System and method for valve seat injection
US-2020149497-A1 · May 14, 2020 · US
Oil Injection Methods for Combustion Enhancement in Natural Gas Reciprocating Engines
US-2020141303-A1 · May 7, 2020 · US
Method for mounting a valve seat ring on a cylinder head of an internal combustion engine
US-2020131952-A1 · Apr 30, 2020 · US
Cylinder head and method for manufacturing the same
US-2020011266-A1 · Jan 9, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F01L3/22?
- CPC F01L3/22 is the Cooperative Patent Classification code for “Valve-seats not provided for in preceding subgroups of this group; Fixing of valve-seats.”
- How many patents are filed under CPC F01L3/22 (Valve-seats not provided for in preceding subgroups of this group; Fixing of valve-seats)?
- Our database includes 109 publications tagged with this CPC code.
- Is patent activity under CPC F01L3/22 growing?
- Publication counts under this code: 7 in 2024 vs 1 in 2025 (latest complete years).