Vehicular lamp
US-11808423-B2 · Nov 7, 2023 · US
by changing their light transmissivity, e.g. by liquid crystal or electrochromic devices
by changing their light transmissivity, e.g. by liquid crystal or electrochromic devices · 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 | F21S41/64 |
| Official title | by changing their light transmissivity, e.g. by liquid crystal or electrochromic devices |
| Display label | by changing their light transmissivity, e.g. by liquid crystal or electrochromic devices |
| Total patents | 76 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2016 | 1 |
| 2017 | 2 |
| 2018 | 7 |
| 2019 | 10 |
| 2020 | 13 |
| 2021 | 11 |
| 2022 | 10 |
| 2023 | 7 |
| 2024 | 5 |
| 2025 | 8 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Vehicle lighting and display systems using switchable opaque film
US-2023339411-A1 · Oct 26, 2023 · US
Lighting device with switching material
US-11791445-B2 · Oct 17, 2023 · US
Vehicle lighting and display systems using switchable opaque film
US-11718242-B2 · Aug 8, 2023 · US
Led array with light intensity adaptive led sidewalls
US-2023043996-A1 · Feb 9, 2023 · US
Light intensity adaptive LED sidewalls
US-11557703-B2 · Jan 17, 2023 · US
In-vehicle headlight and light projection method
US-11512829-B2 · Nov 29, 2022 · US
Vehicle head lamp
US-11506357-B2 · Nov 22, 2022 · US
Method of addressing an LED array with light intensity adaptive LED sidewalls
US-11489095-B2 · Nov 1, 2022 · US
In-vehicle headlight and light projection method
US-2022333756-A1 · Oct 20, 2022 · US
In-vehicle headlight and light projection method
US-11448379-B2 · Sep 20, 2022 · US
Vehicular lamp
US-2022282844-A1 · Sep 8, 2022 · US
Lighting device with switching material
US-11437553-B2 · Sep 6, 2022 · US
Lighting device capable of controlling light radiation direction
US-11326765-B2 · May 10, 2022 · US
Lighting device capable of controlling light radiation direction
US-2022065426-A1 · Mar 3, 2022 · US
Vehicle headlight
US-2022034469-A1 · Feb 3, 2022 · US
In-vehicle headlight and light projection method
US-2021381671-A1 · Dec 9, 2021 · US
In-vehicle headlight and light projection method
US-11118750-B2 · Sep 14, 2021 · US
Vehicle headlight system
US-11110853-B2 · Sep 7, 2021 · US
Vehicle lamp
US-11066006-B2 · Jul 20, 2021 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F21S41/64?
- CPC F21S41/64 is the Cooperative Patent Classification code for “by changing their light transmissivity, e.g. by liquid crystal or electrochromic devices.”
- How many patents are filed under CPC F21S41/64 (by changing their light transmissivity, e.g. by liquid crystal or electrochromic devices)?
- Our database includes 76 publications tagged with this CPC code.
- Is patent activity under CPC F21S41/64 growing?
- Publication counts under this code: 5 in 2024 vs 8 in 2025 (latest complete years).