Vehicle lamp
US-2020248884-A1 · Aug 6, 2020 · US
circulating the gas within a closed system
circulating the gas within a closed system · 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 | F21S45/435 |
| Official title | circulating the gas within a closed system |
| Display label | circulating the gas within a closed system |
| Total patents | 110 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 7 |
| 2016 | 16 |
| 2017 | 9 |
| 2018 | 9 |
| 2019 | 17 |
| 2020 | 6 |
| 2021 | 14 |
| 2022 | 13 |
| 2023 | 7 |
| 2024 | 6 |
| 2025 | 6 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Vehicle lamp
US-2020088381-A1 · Mar 19, 2020 · US
Vehicular lamp
US-2019376659-A1 · Dec 12, 2019 · US
Lighting fixture for vehicle
US-2019360682-A1 · Nov 28, 2019 · US
Vehicle head lamp
US-10436415-B2 · Oct 8, 2019 · US
Light emitting diode having a plurality of light emitting cells
US-2019280178-A1 · Sep 12, 2019 · US
Headlamp assemblies with bezel structures having airflow openings
US-10408414-B2 · Sep 10, 2019 · US
Light source module and lamp using the same
US-10400982-B2 · Sep 3, 2019 · US
Lamp unit and vehicle headlamp
US-10359169-B2 · Jul 23, 2019 · US
Device for preventing dewing of headlamp
US-10330278-B2 · Jun 25, 2019 · US
Vehicle lamp
US-10309606-B2 · Jun 4, 2019 · US
Light-emitting diode and manufacturing method therefor
US-10290772-B2 · May 14, 2019 · US
Light emitting element
US-2019123244-A1 · Apr 25, 2019 · US
Vehicle lamp
US-10267476-B2 · Apr 23, 2019 · US
Lighting and/or signaling device for a motor vehicle, provided with a light module cooled by means of an air flow generator
US-10228105-B2 · Mar 12, 2019 · US
Vehicle head lamp
US-2019072255-A1 · Mar 7, 2019 · US
Optical unit and vehicle lamp
US-10208911-B2 · Feb 19, 2019 · US
Light source unit and lamp
US-10208942-B2 · Feb 19, 2019 · US
Light emitting element
US-10186638-B2 · Jan 22, 2019 · US
Lighting system and selective retro-reflection apparatus
US-10161597-B2 · Dec 25, 2018 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F21S45/435?
- CPC F21S45/435 is the Cooperative Patent Classification code for “circulating the gas within a closed system.”
- How many patents are filed under CPC F21S45/435 (circulating the gas within a closed system)?
- Our database includes 110 publications tagged with this CPC code.
- Is patent activity under CPC F21S45/435 growing?
- Publication counts under this code: 6 in 2024 vs 6 in 2025 (latest complete years).