Rotor for a rotary engine
US-11976559-B1 · May 7, 2024 · US
Lubrication (of machines or engines in general F01M)
Lubrication (of machines or engines in general F01M) · 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 | F01C21/04 |
| Official title | Lubrication (of machines or engines in general F01M) |
| Display label | Lubrication (of machines or engines in general F01M) |
| Total patents | 39 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2016 | 5 |
| 2017 | 1 |
| 2018 | 6 |
| 2019 | 2 |
| 2020 | 7 |
| 2021 | 10 |
| 2022 | 4 |
| 2023 | 2 |
| 2024 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Scroll compressor including hub lubricant passage
US-11933304-B2 · Mar 19, 2024 · US
Scroll compressor
US-2023060653-A1 · Mar 2, 2023 · US
Device and method for operating volumetric expansion machines
US-11585231-B2 · Feb 21, 2023 · US
Rotary engine
US-11459891-B2 · Oct 4, 2022 · US
Rotary internal combustion engine with seal lubrication
US-11428128-B2 · Aug 30, 2022 · US
Screw rotor, fluid machine main body, and fluid machine
US-11415134-B2 · Aug 16, 2022 · US
Cylindrical symmetric volumetric machine
US-11384762-B2 · Jul 12, 2022 · US
Rotary engine lubrication system using intensifier injector
US-2021355898-A1 · Nov 18, 2021 · US
Rotary engine lubrication system using intensifier injector
US-11174732-B1 · Nov 16, 2021 · US
Sealing member
US-11143029-B2 · Oct 12, 2021 · US
Rotary internal combustion engine with seal lubrication
US-2021231033-A1 · Jul 29, 2021 · US
Device and method for operating volumetric expansion machines
US-2021215058-A1 · Jul 15, 2021 · US
Scroll fluid machine having injection holes through which lubricant is injected to the orbiting bearing
US-11041387-B2 · Jun 22, 2021 · US
Method of apex seal lubrication for a rotary internal combustion engine
US-11008909-B2 · May 18, 2021 · US
External gear machine
US-2021131285-A1 · May 6, 2021 · US
Screw Rotor, Fluid Machine Main Body, and Fluid Machine
US-2021017986-A1 · Jan 21, 2021 · US
Rotary engine
US-2021003011-A1 · Jan 7, 2021 · US
Rotary engine with oil pump
US-10774646-B2 · Sep 15, 2020 · US
Cylindrical symmetric volumetric machine
US-2020217320-A1 · Jul 9, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F01C21/04?
- CPC F01C21/04 is the Cooperative Patent Classification code for “Lubrication (of machines or engines in general F01M).”
- How many patents are filed under CPC F01C21/04 (Lubrication (of machines or engines in general F01M))?
- Our database includes 39 publications tagged with this CPC code.
- Is patent activity under CPC F01C21/04 growing?
- Publication counts under this code: 2 in 2023 vs 2 in 2024 (latest complete years).