Oil-lubricated vacuum pump with improved oil sealing
US-12584501-B2 · Mar 24, 2026 · US
Liquid sealing for high-vacuum pumps {or for compressors}
Liquid sealing for high-vacuum pumps {or for compressors} · 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 | F04C27/02 |
| Official title | Liquid sealing for high-vacuum pumps {or for compressors} |
| Display label | Liquid sealing for high-vacuum pumps {or for compressors} |
| Total patents | 51 |
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 | 1 |
| 2016 | 7 |
| 2017 | 5 |
| 2018 | 3 |
| 2019 | 5 |
| 2020 | 2 |
| 2021 | 5 |
| 2022 | 4 |
| 2023 | 13 |
| 2024 | 3 |
| 2025 | 1 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Vacuum pumping system having an oil-lubricated vacuum pump
US-12571393-B2 · Mar 10, 2026 · US
Oil-lubricated vacuum pump with improved oil sealing
US-2025003427-A1 · Jan 2, 2025 · US
Vacuum pump system and method for operating a vacuum pump system
US-12140146-B2 · Nov 12, 2024 · US
Screw compressor with oil injection at multiple volume ratios
US-12117001-B2 · Oct 15, 2024 · US
Vacuum pump lubricant recovery system returning lubricant from the air filter based on pressure measurements in the vacuum pump
US-12104597-B2 · Oct 1, 2024 · US
Air extractor
US-2023375007-A1 · Nov 23, 2023 · US
Scroll compressor with inclined wall surface extending from the dust wrap
US-11821423-B2 · Nov 21, 2023 · US
Screw compressor with oil injection at multiple volume ratios
US-2023349384-A1 · Nov 2, 2023 · US
Cupseal for compressor and method for preparing the same
US-11773976-B2 · Oct 3, 2023 · US
Compressor or vacuum pump device, a liquid return system for such a compressor or vacuum pump device and a method for draining liquid from a gearbox of such a compressor or vacuum pump device
US-11767847-B2 · Sep 26, 2023 · US
Liquid blade pump
US-2023296095-A1 · Sep 21, 2023 · US
Liquid blade pump
US-2023279875-A1 · Sep 7, 2023 · US
Screw compressor with oil injection at multiple volume ratios
US-11732715-B2 · Aug 22, 2023 · US
Rotary compressor including a bearing containing an asymmetrical pocket to improve compressor efficiency
US-11703055-B2 · Jul 18, 2023 · US
A lubricant recovery system
US-2023122823-A1 · Apr 20, 2023 · US
Liquid ring pump control
US-11619232-B2 · Apr 4, 2023 · US
Scroll Compressor
US-2023069695-A1 · Mar 2, 2023 · US
Vacuum pump system and method for operating a vacuum pump system
US-2023033429-A1 · Feb 2, 2023 · US
Gas pump with pressure relief for reducing the starting torque
US-11506204-B2 · Nov 22, 2022 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F04C27/02?
- CPC F04C27/02 is the Cooperative Patent Classification code for “Liquid sealing for high-vacuum pumps {or for compressors}.”
- How many patents are filed under CPC F04C27/02 (Liquid sealing for high-vacuum pumps {or for compressors})?
- Our database includes 51 publications tagged with this CPC code.
- Is patent activity under CPC F04C27/02 growing?
- Publication counts under this code: 3 in 2024 vs 1 in 2025 (latest complete years).