Interaction module
US-2020408411-A1 · Dec 31, 2020 · US
Observation or illuminating devices
Observation or illuminating 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 | F27D21/02 |
| Official title | Observation or illuminating devices |
| Display label | Observation or illuminating devices |
| Total patents | 168 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 8 |
| 2016 | 4 |
| 2017 | 12 |
| 2018 | 10 |
| 2019 | 15 |
| 2020 | 25 |
| 2021 | 17 |
| 2022 | 21 |
| 2023 | 13 |
| 2024 | 21 |
| 2025 | 13 |
| 2026 | 9 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Oven comprising a camera
US-10808941-B2 · Oct 20, 2020 · US
Diagnosis support apparatus, diagnosis support method, diagnosis method, and repair method of vacuum degassing tank
US-10761035-B2 · Sep 1, 2020 · US
Method of operating a furnace
US-10746470-B2 · Aug 18, 2020 · US
Cooking appliance with a user interface
US-2020166216-A1 · May 28, 2020 · US
Flame analytics system
US-2020141653-A1 · May 7, 2020 · US
Cooking appliance with a user interface
US-10605463-B2 · Mar 31, 2020 · US
Oven having an imaging device
US-10591218-B2 · Mar 17, 2020 · US
Slag volume evaluation method for molten metal surface
US-2020064326-A1 · Feb 27, 2020 · US
Furnace monitoring device and gasification unit provided with same
US-10571195-B2 · Feb 25, 2020 · US
Artificial intelligence cooking device
US-2020018551-A1 · Jan 16, 2020 · US
Diagnosis support apparatus, diagnosis support method, diagnosis method, and repair method of vacuum degassing tank
US-2019360944-A1 · Nov 28, 2019 · US
Method and arrangement for measurement of electrode paste in an electrode column of an electric arc furnace
US-10401090-B2 · Sep 3, 2019 · US
Molten metal temperature control method
US-10393440-B2 · Aug 27, 2019 · US
Method of assembling or disassembling housing shelf, method of producing ceramic fired body, and transferring system
US-2019255711-A1 · Aug 22, 2019 · US
Gas analysis system and boiler
US-10302558-B2 · May 28, 2019 · US
Cooking engagement system
US-2019154267-A1 · May 23, 2019 · US
Oven having an imaging device
US-2019128611-A1 · May 2, 2019 · US
Cooking appliance with a user interface
US-2019128531-A1 · May 2, 2019 · US
Method and device for detecting straightness deviations and/or deformations in a rotary kiln
US-10254045-B2 · Apr 9, 2019 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F27D21/02?
- CPC F27D21/02 is the Cooperative Patent Classification code for “Observation or illuminating devices.”
- How many patents are filed under CPC F27D21/02 (Observation or illuminating devices)?
- Our database includes 168 publications tagged with this CPC code.
- Is patent activity under CPC F27D21/02 growing?
- Publication counts under this code: 21 in 2024 vs 13 in 2025 (latest complete years).