- All sections
- B - Performing operations; transporting
- B43L - Articles for writing or drawing upon; accessories for writing or drawing
- B43L 21/02 - Blackboard or slate-cleaning devices with means for absorbing the chalk dust
Patent holdings for IPC class B43L 21/02
Total number of patents in this class: 3
10-year publication summary
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0
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0
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0
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0
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2
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0
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0
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0
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0
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0
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| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Universidad de Valladolid | 106 |
1 |
| Shandong Yingcai University | 39 |
1 |
| Vega Ingeniería, S.L. | 3 |
1 |
| Other owners | 0 |