Concentration measuring method, concentration measuring apparatus, and program
US-2025347605-A1 · Nov 13, 2025 · US
Special adaptations for indicating, recording, or control
Special adaptations for indicating, recording, or control · Cooperative Patent Classification (CPC)
Computing, optics, measurement, and control technologies.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | G01N9/18 |
| Official title | Special adaptations for indicating, recording, or control |
| Display label | Special adaptations for indicating, recording, or control |
| Total patents | 25 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2017 | 1 |
| 2018 | 3 |
| 2019 | 3 |
| 2020 | 2 |
| 2021 | 4 |
| 2022 | 3 |
| 2023 | 2 |
| 2024 | 5 |
| 2025 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Sample analysis with mirrors
US-12287350-B2 · Apr 29, 2025 · US
Hydrometer device
US-12092651-B2 · Sep 17, 2024 · US
Method for measuring densities based on circular magnetic levitation
US-11965904-B2 · Apr 23, 2024 · US
Automatic liquid density measurement device
US-11913968-B2 · Feb 27, 2024 · US
Method and device for determining the amount of a gas present in a battery cell
US-11906382-B2 · Feb 20, 2024 · US
Strain sensor based downhole fluid density measurement tool
US-11879905-B2 · Jan 23, 2024 · US
Hydrometer device
US-2023324269-A1 · Oct 12, 2023 · US
Apparatus for determining a vertical level or density profile of a fluid column
US-11555733-B2 · Jan 17, 2023 · US
Automatic liquid density measurement device
US-2022113237-A1 · Apr 14, 2022 · US
Strain sensor based downhole fluid density measurement tool
US-2022050036-A1 · Feb 17, 2022 · US
Method and device for determining the amount of a gas present in a battery cell
US-2022011185-A1 · Jan 13, 2022 · US
Sample analysis with mirrors
US-2021341369-A1 · Nov 4, 2021 · US
Method for measuring densities based on circular magnetic levitation
US-2021215589-A1 · Jul 15, 2021 · US
An apparatus for determining a vertical level or density profile of a fluid column
US-2021199486-A1 · Jul 1, 2021 · US
Detecting fluid characteristics via a float
US-10955280-B2 · Mar 23, 2021 · US
Detecting fluid level via a float
US-10788355-B2 · Sep 29, 2020 · US
Fluid monitoring apparatus including fluid density detection system for subsea apparatus
US-10591346-B2 · Mar 17, 2020 · US
Digital hydrometer assistant reader
US-10379023-B2 · Aug 13, 2019 · US
Density compensation for electromechanical liquid level gauges
US-10274355-B2 · Apr 30, 2019 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC G01N9/18?
- CPC G01N9/18 is the Cooperative Patent Classification code for “Special adaptations for indicating, recording, or control.”
- How many patents are filed under CPC G01N9/18 (Special adaptations for indicating, recording, or control)?
- Our database includes 25 publications tagged with this CPC code.
- Is patent activity under CPC G01N9/18 growing?
- Publication counts under this code: 5 in 2024 vs 2 in 2025 (latest complete years).