Air tightness check method and test system
US-2026085991-A1 · Mar 26, 2026 · US
for verifying the internal pressure of closed containers
for verifying the internal pressure of closed containers · Cooperative Patent Classification (CPC)
Computing, optics, measurement, and control technologies.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | G01M3/329 |
| Official title | {for verifying the internal pressure of closed containers} |
| Display label | for verifying the internal pressure of closed containers |
| Total patents | 42 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 2 |
| 2016 | 4 |
| 2017 | 5 |
| 2018 | 5 |
| 2019 | 7 |
| 2020 | 5 |
| 2021 | 2 |
| 2022 | 3 |
| 2023 | 4 |
| 2025 | 4 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Vacuum-based leak detection
US-12480832-B2 · Nov 25, 2025 · US
Apparatus for analyzing battery case
US-12456761-B2 · Oct 28, 2025 · US
Helium detection system and method
US-2025293318-A1 · Sep 18, 2025 · US
Battery test tooling, and use method and control method for battery test tooling
US-2025116567-A1 · Apr 10, 2025 · US
Apparatus for analyzing battery case
US-2023420748-A1 · Dec 28, 2023 · US
Closed loudspeaker box, display device and method for testing closed loudspeaker box
US-11736857-B2 · Aug 22, 2023 · US
Vacuum-Based Leak Detection
US-2023139875-A1 · May 4, 2023 · US
Leak detection system and method
US-11566962-B2 · Jan 31, 2023 · US
Method for testing the hermetic seal of a package
US-11353503-B2 · Jun 7, 2022 · US
Sealing performance test method, apparatus, and storage medium
US-11346743-B2 · May 31, 2022 · US
Closed loudspeaker box, display device and method for testing closed loudspeaker box
US-2022030352-A1 · Jan 27, 2022 · US
Device and method for checking pouches for filling lines
US-11067471-B2 · Jul 20, 2021 · US
High pressure tank device and method of detecting leakage in high pressure tank device
US-10890296-B2 · Jan 12, 2021 · US
Method for testing a container for tightness
US-10697850-B2 · Jun 30, 2020 · US
Device and method for calibrating a film chamber for leak detection
US-10670489-B2 · Jun 2, 2020 · US
Testing device and method for testing the tightness of containers
US-10641678-B2 · May 5, 2020 · US
Testing device for checking the leak tightness of containers, and method therefor
US-10612993-B2 · Apr 7, 2020 · US
Method for testing the hermetic seal of a package
US-2020003831-A1 · Jan 2, 2020 · US
Power storage device manufacturing method, manufacturing device, liquid injection device, and liquid injection method
US-10505176-B2 · Dec 10, 2019 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC G01M3/329?
- CPC G01M3/329 is the Cooperative Patent Classification code for “for verifying the internal pressure of closed containers.”
- How many patents are filed under CPC G01M3/329 (for verifying the internal pressure of closed containers)?
- Our database includes 42 publications tagged with this CPC code.
- Is patent activity under CPC G01M3/329 growing?
- Publication counts under this code: 4 in 2023 vs 4 in 2025 (latest complete years).