Chemical purity assessment by image analysis
US-12412309-B2 · Sep 9, 2025 · US
with colour charts, graduated scales or turrets
with colour charts, graduated scales or turrets · Cooperative Patent Classification (CPC)
Computing, optics, measurement, and control technologies.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | G01N21/293 |
| Official title | {with colour charts, graduated scales or turrets} |
| Display label | with colour charts, graduated scales or turrets |
| Total patents | 65 |
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 | 7 |
| 2016 | 3 |
| 2017 | 5 |
| 2018 | 4 |
| 2019 | 6 |
| 2020 | 2 |
| 2021 | 3 |
| 2022 | 9 |
| 2023 | 10 |
| 2024 | 5 |
| 2025 | 8 |
| 2026 | 3 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Sensor device, object detection method, and object detection program
US-2025251385-A1 · Aug 7, 2025 · US
Colorimetric apparatus
US-12359974-B2 · Jul 15, 2025 · US
Dry quality evaluation device for electrode and dry quality evaluation method for electrode
US-12298229-B2 · May 13, 2025 · US
Rapid screening for elevated bile acids using whole blood
US-2025076280-A1 · Mar 6, 2025 · US
Electrode drying device and electrode drying method
US-12209805-B2 · Jan 28, 2025 · US
Methods and kits for rapid, colormetric beryllium detection
US-2024353340-A1 · Oct 24, 2024 · US
Apparatus and method for transferring a fluid sample from a fluid sample collection apparatus to a liquid sample analyzer
US-2024286139-A1 · Aug 29, 2024 · US
Method for determining the presence of an acidic sulfide species in a non-aqueous liquid using a metal complex dye
US-11988608-B2 · May 21, 2024 · US
Chemical purity assessment by image analysis
US-2024127483-A1 · Apr 18, 2024 · US
Coupon design for enhanced color sensitivity for colorimetric-based chemical analysis of liquids
US-11946872-B2 · Apr 2, 2024 · US
Colorimetric apparatus
US-2023251138-A1 · Aug 10, 2023 · US
Method of determining the concentration of at least one analyte in a body fluid
US-2023236174-A1 · Jul 27, 2023 · US
Beverage dispense monitoring with camera
US-11708260-B2 · Jul 25, 2023 · US
Electrode quality evaluation method and electrode manufacturing method
US-2023152214-A1 · May 18, 2023 · US
Dry quality evaluation device for electrode and dry quality evaluation method for electrode
US-2023127402-A1 · Apr 27, 2023 · US
Modified metal nanoparticle and method for manufacturing the same
US-11635388-B2 · Apr 25, 2023 · US
Cell-free biosensors to detect creatinine, creatine, and sarcosine
US-2023109434-A1 · Apr 6, 2023 · US
Method of determining the concentration of an analyte in a sample of a body fluid
US-2023103160-A1 · Mar 30, 2023 · US
Method of evaluating the quality of a color reference card
US-2023084800-A1 · Mar 16, 2023 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC G01N21/293?
- CPC G01N21/293 is the Cooperative Patent Classification code for “with colour charts, graduated scales or turrets.”
- How many patents are filed under CPC G01N21/293 (with colour charts, graduated scales or turrets)?
- Our database includes 65 publications tagged with this CPC code.
- Is patent activity under CPC G01N21/293 growing?
- Publication counts under this code: 5 in 2024 vs 8 in 2025 (latest complete years).