- All sections
- B - Performing operations; transporting
- B43K - Implements for writing or drawing
- B43K 21/033 - Writing-core feeding mechanisms with sliding tube-like writing-core guide with automatic feed by pressure during use of pencil
Patent holdings for IPC class B43K 21/033
Total number of patents in this class: 8
10-year publication summary
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0
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0
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0
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1
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0
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1
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0
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0
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3
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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
|
|---|---|---|
| Mitsubishi Pencil Company, Limited | 679 |
4 |
| Pentel Kabushiki Kaisha | 153 |
1 |
| Wacom Co., Ltd. | 1629 |
1 |
| LIU, Pao-Hung | 5 |
1 |
| LIU, Yu-Chia | 7 |
1 |
| Other owners | 0 |