Apparatus, system and method for gas detection, and apparatus manufacturing method
US-10845303-B2 · Nov 24, 2020 · US
for investigating presence of specific gases or aerosols (G01N31/221, G01N31/222 take precedence; actuation of fire alarm by presence of smoke or gases G08B17/10)
for investigating presence of specific gases or aerosols (G01N31/221, G01N31/222 take precedence; actuation of fire alarm by presence of smoke or gases G08B17/10) · Cooperative Patent Classification (CPC)
Computing, optics, measurement, and control technologies.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | G01N31/223 |
| Official title | {for investigating presence of specific gases or aerosols (G01N31/221, G01N31/222 take precedence; actuation of fire alarm by presence of smoke or gases G08B17/10)} |
| Display label | for investigating presence of specific gases or aerosols (G01N31/221, G01N31/222 take precedence; actuation of fire alarm by presence of smoke or gases G08B17/10) |
| Total patents | 136 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 4 |
| 2016 | 13 |
| 2017 | 14 |
| 2018 | 16 |
| 2019 | 12 |
| 2020 | 24 |
| 2021 | 14 |
| 2022 | 12 |
| 2023 | 7 |
| 2024 | 13 |
| 2025 | 6 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Gas sensor, refrigerator including same and control method therefor
US-2019390896-A1 · Dec 26, 2019 · US
Gas identification by measuring stain development at multiple specific wavelength regions with narrow band optical sensors
US-10436761-B2 · Oct 8, 2019 · US
Gas sensor, refrigerator including same and control method therefor
US-10422576-B2 · Sep 24, 2019 · US
Carbon dioxide chemical sensor having amino acid-based compound and carbon dioxide detection method using the same
US-10422779-B2 · Sep 24, 2019 · US
Patterned chemical indicator
US-2019242861-A1 · Aug 8, 2019 · US
Functional Surfaces for Liquid Crystal-Based Detection of Chlorine Gas
US-2019212254-A1 · Jul 11, 2019 · US
Colorimetric detection of airborne sulfur
US-2019162671-A1 · May 30, 2019 · US
Hydrogen sulfide detecting apparatus
US-10254262-B2 · Apr 9, 2019 · US
Film sensor
US-10241099-B2 · Mar 26, 2019 · US
Phthalocyanine Compounds for Sensing Carbon Dioxide and Use
US-2019072530-A1 · Mar 7, 2019 · US
Gas detection material, gas detection tape and lithium ion secondary battery
US-10224576-B2 · Mar 5, 2019 · US
Probing film that absorbs and reacts with gases, with light of different wavelengths, humidity detection, and optionally temperature detection
US-2019041338-A1 · Feb 7, 2019 · US
Active and intelligent additive, polymer and article
US-10144817-B2 · Dec 4, 2018 · US
Excimer laser oscillation device having gas recycle function
US-2018337510-A1 · Nov 22, 2018 · US
Method for diagnosing rheumatoid arthritis
US-2018313801-A1 · Nov 1, 2018 · US
Measuring device, reaction carrier and measuring method
US-10054574-B2 · Aug 21, 2018 · US
Optochemical sensor
US-2018164263-A1 · Jun 14, 2018 · US
Chemosensing hydrogel for the detection of biogenic amines
US-9983185-B2 · May 29, 2018 · US
Metalloprotein compositions
US-2018119194-A1 · May 3, 2018 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC G01N31/223?
- CPC G01N31/223 is the Cooperative Patent Classification code for “for investigating presence of specific gases or aerosols (G01N31/221, G01N31/222 take precedence; actuation of fire alarm by presence of smoke or gases G08B17/10).”
- How many patents are filed under CPC G01N31/223 (for investigating presence of specific gases or aerosols (G01N31/221, G01N31/222 take precedence; actuation of fire alarm by presence of smoke or gases G08B17/10))?
- Our database includes 136 publications tagged with this CPC code.
- Is patent activity under CPC G01N31/223 growing?
- Publication counts under this code: 13 in 2024 vs 6 in 2025 (latest complete years).