Thrust receiving mechanism
US-2026022700-A1 · Jan 22, 2026 · US
Internal leakage control
Internal leakage control · 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 | F04C29/0028 |
| Official title | {Internal leakage control} |
| Display label | Internal leakage control |
| Total patents | 58 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 2 |
| 2016 | 1 |
| 2017 | 1 |
| 2018 | 3 |
| 2019 | 8 |
| 2020 | 5 |
| 2021 | 7 |
| 2022 | 7 |
| 2023 | 8 |
| 2024 | 7 |
| 2025 | 8 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Scroll compressor
US-12467456-B2 · Nov 11, 2025 · US
Scavenge loss limiter for a rotary compressor
US-2025264103-A1 · Aug 21, 2025 · US
Rotary compressor
US-12305642-B2 · May 20, 2025 · US
Device for controlling a fluid mass flow for a device for compressing a gaseous fluid and device for compressing a gaseous fluid
US-12292051-B2 · May 6, 2025 · US
Scroll compressor
US-12215685-B2 · Feb 4, 2025 · US
Scavenge loss limiter for a rotary compressor
US-12215692-B1 · Feb 4, 2025 · US
Rotary compressor
US-2025035113-A1 · Jan 30, 2025 · US
Driveshaft assemblies and compressors including the same
US-12188355-B2 · Jan 7, 2025 · US
Device for controlling a fluid mass flow for a device for compressing a gaseous fluid and device for compressing a gaseous fluid
US-2024426301-A1 · Dec 26, 2024 · US
Sliding component
US-12110923-B2 · Oct 8, 2024 · US
Scroll compressor with a thrust plate and a flexible thrust sheet member
US-12092104-B2 · Sep 17, 2024 · US
Scroll compressor
US-2024301880-A1 · Sep 12, 2024 · US
Driveshaft assemblies and compressors including the same
US-2024287904-A1 · Aug 29, 2024 · US
Scroll compressor
US-2024151227-A1 · May 9, 2024 · US
Scroll compressor
US-2024060494-A1 · Feb 22, 2024 · US
Rotary compressor
US-2023349382-A1 · Nov 2, 2023 · US
Rotary compressor
US-11746783-B2 · Sep 5, 2023 · US
Axial pressure relief in slide bearings of pumps
US-11719242-B2 · Aug 8, 2023 · US
Bearing structure for gear in external gear pump
US-2023184247-A1 · Jun 15, 2023 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F04C29/0028?
- CPC F04C29/0028 is the Cooperative Patent Classification code for “Internal leakage control.”
- How many patents are filed under CPC F04C29/0028 (Internal leakage control)?
- Our database includes 58 publications tagged with this CPC code.
- Is patent activity under CPC F04C29/0028 growing?
- Publication counts under this code: 7 in 2024 vs 8 in 2025 (latest complete years).