Hardness test apparatus and hardness testing method
US-10163201-B2 · Dec 25, 2018 · US
Investigating hardness or rebound hardness
Investigating hardness or rebound hardness · Cooperative Patent Classification (CPC)
Computing, optics, measurement, and control technologies.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | G01N3/40 |
| Official title | Investigating hardness or rebound hardness |
| Display label | Investigating hardness or rebound hardness |
| Total patents | 194 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 11 |
| 2016 | 15 |
| 2017 | 16 |
| 2018 | 22 |
| 2019 | 25 |
| 2020 | 18 |
| 2021 | 18 |
| 2022 | 17 |
| 2023 | 26 |
| 2024 | 13 |
| 2025 | 11 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Sensor system for determining soil characteristics
US-2018340845-A1 · Nov 29, 2018 · US
Methods for evaluating superabrasive elements
US-10101263-B1 · Oct 16, 2018 · US
Shelf-plate crack detecting method, honeycomb structure delivering method, shelf-plate crack detecting apparatus, and shelf plate delivering apparatus
US-10101254-B2 · Oct 16, 2018 · US
Measurement device, method, and recording medium
US-10067057-B2 · Sep 4, 2018 · US
Floor covering having adjustable hardness
US-10066391-B2 · Sep 4, 2018 · US
Vehicle fingerprint bookmark
US-10061960-B2 · Aug 28, 2018 · US
Crack sensor and crack monitoring device
US-10048184-B2 · Aug 14, 2018 · US
Synthetic Target Material for Shaped Charge Performance Evaluation, Powdered Metal
US-2018224418-A1 · Aug 9, 2018 · US
Material testing system and method of use
US-2018195940-A1 · Jul 12, 2018 · US
Thermometric metallurgy materials
US-2018169751-A1 · Jun 21, 2018 · US
Durometer
US-2018172569-A1 · Jun 21, 2018 · US
Drop testing apparatus
US-2018120208-A1 · May 3, 2018 · US
Vehicle fingerprint bookmark
US-9944241-B2 · Apr 17, 2018 · US
Method for determining mechanical properties of a material
US-9897522-B2 · Feb 20, 2018 · US
Vehicle fingerprint bookmark
US-2018046839-A1 · Feb 15, 2018 · US
Methods and systems for estimating the hardness of a rock mass
US-2018010437-A1 · Jan 11, 2018 · US
Residual stress evaluation method
US-2018010205-A1 · Jan 11, 2018 · US
Vehicle fingerprint bookmark
US-9830492-B2 · Nov 28, 2017 · US
Calibration method for the brittle fracture assessment parameters for materials based on the Beremin model
US-9810615-B2 · Nov 7, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC G01N3/40?
- CPC G01N3/40 is the Cooperative Patent Classification code for “Investigating hardness or rebound hardness.”
- How many patents are filed under CPC G01N3/40 (Investigating hardness or rebound hardness)?
- Our database includes 194 publications tagged with this CPC code.
- Is patent activity under CPC G01N3/40 growing?
- Publication counts under this code: 13 in 2024 vs 11 in 2025 (latest complete years).