Light fixture
US-12516806-B2 · Jan 6, 2026 · US
the gas flowing in a closed circuit
the gas flowing in a closed circuit · 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 | F21V29/65 |
| Official title | the gas flowing in a closed circuit |
| Display label | the gas flowing in a closed circuit |
| 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 | 7 |
| 2016 | 8 |
| 2017 | 4 |
| 2018 | 10 |
| 2019 | 9 |
| 2020 | 6 |
| 2021 | 3 |
| 2023 | 2 |
| 2025 | 1 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Light Fixture
US-2025116397-A1 · Apr 10, 2025 · US
Light irradiation device
US-2023245880-A1 · Aug 3, 2023 · US
Stage light with defogging device
US-11662088-B1 · May 30, 2023 · US
Finned heat-exchange system
US-11131505-B2 · Sep 28, 2021 · US
Gas cooled LED lamp
US-RE48489-E · Mar 30, 2021 · US
Light conversion device, light source apparatus, and projection display apparatus with improved cooling efficiency
US-10890835-B2 · Jan 12, 2021 · US
Phosphor wheel, and phosphor wheel device, light conversion unit, and projection display apparatus, each provided with phosphor wheel
US-10845686-B2 · Nov 24, 2020 · US
Color wheel apparatus
US-2020271301-A1 · Aug 27, 2020 · US
Finned Heat-Exchange System
US-2020173725-A1 · Jun 4, 2020 · US
Lighting device with dispenser for a reactive substance
US-10663116-B2 · May 26, 2020 · US
Wavelength conversion device, illumination device, and projector
US-10648653-B2 · May 12, 2020 · US
Light source device and image display device
US-10606155-B2 · Mar 31, 2020 · US
Phosphor wheel, and phosphor wheel device, light conversion unit, and projection display apparatus, each provided with phosphor wheel
US-2019353993-A1 · Nov 21, 2019 · US
LED filament light source and lamp
US-10473272-B2 · Nov 12, 2019 · US
Led bulb with glass envelope
US-2019277487-A1 · Sep 12, 2019 · US
Sealed wavelength conversion device and cooling system
US-10401014-B2 · Sep 3, 2019 · US
Led filament light source and lamp
US-2019186698-A1 · Jun 20, 2019 · US
Laser light source and laser projection display device
US-10317782-B2 · Jun 11, 2019 · US
Wavelength conversion device, illumination device, and projector
US-2019072264-A1 · Mar 7, 2019 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F21V29/65?
- CPC F21V29/65 is the Cooperative Patent Classification code for “the gas flowing in a closed circuit.”
- How many patents are filed under CPC F21V29/65 (the gas flowing in a closed circuit)?
- Our database includes 51 publications tagged with this CPC code.
- Is patent activity under CPC F21V29/65 growing?
- Publication counts under this code: 2 in 2023 vs 1 in 2025 (latest complete years).