Lighting apparatus
US-2019234581-A1 · Aug 1, 2019 · US
Filters
Filters · 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 | F21S43/255 |
| Official title | {Filters} |
| Display label | Filters |
| Total patents | 291 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly growing.
| Year | Patents |
|---|---|
| 2015 | 13 |
| 2016 | 11 |
| 2017 | 16 |
| 2018 | 19 |
| 2019 | 36 |
| 2020 | 17 |
| 2021 | 19 |
| 2022 | 37 |
| 2023 | 33 |
| 2024 | 41 |
| 2025 | 41 |
| 2026 | 8 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Vehicle lamp using semiconductor light emitting device
US-2018313514-A1 · Nov 1, 2018 · US
Three mode police mirror
US-10106076-B2 · Oct 23, 2018 · US
Vehicle illuminated airflow control device
US-2018281666-A1 · Oct 4, 2018 · US
Lighting apparatus and method of alignment
US-2018274747-A1 · Sep 27, 2018 · US
Automotive vehicle lighting device with electrical connection circuit board connected to substrate by anisotropic conductive film
US-10082265-B2 · Sep 25, 2018 · US
Vehicle illumination assembly
US-2018257546-A1 · Sep 13, 2018 · US
Light guiding device
US-10060594-B2 · Aug 28, 2018 · US
Application of electrochromic polymers as color and opacity light filters
US-2018238517-A1 · Aug 23, 2018 · US
Light system
US-2018208105-A1 · Jul 26, 2018 · US
Lighting system and indicating method for a vehicle
US-10029610-B1 · Jul 24, 2018 · US
Light source unit with light emitting module, sealing part and lens part
US-10018324-B2 · Jul 10, 2018 · US
Fiber optic light panel device with plural outputs
US-2018142860-A1 · May 24, 2018 · US
Display device
US-2018119922-A1 · May 3, 2018 · US
Fiber optic light panel having a light enhancing element
US-9927087-B1 · Mar 27, 2018 · US
Light device comprising a surface light source
US-2018080619-A1 · Mar 22, 2018 · US
Luminaire with selectable emission pattern
US-9909727-B2 · Mar 6, 2018 · US
Vehicle rear lighting assembly
US-9896023-B1 · Feb 20, 2018 · US
Photoluminescent printed LED molding
US-9868387-B2 · Jan 16, 2018 · US
Light-emitting unit with optical plate reflecting excitation light and transmitting fluorescent light, and light-emitting device, illumination device, and vehicle headlight including the unit
US-9863595-B2 · Jan 9, 2018 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F21S43/255?
- CPC F21S43/255 is the Cooperative Patent Classification code for “Filters.”
- How many patents are filed under CPC F21S43/255 (Filters)?
- Our database includes 291 publications tagged with this CPC code.
- Is patent activity under CPC F21S43/255 growing?
- Publication counts under this code: 41 in 2024 vs 41 in 2025 (latest complete years).