- All sections
- E - Fixed constructions
- E04F - Finishing work on buildings, e.g. stairs, floors
- E04F 11/028 - Stairways having stringers having a central stringer
Patent holdings for IPC class E04F 11/028
Total number of patents in this class: 6
10-year publication summary
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0
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0
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1
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0
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0
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2
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0
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2
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1
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0
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| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Jiangsu Huning Steel; Mechanism Co., Ltd | 12 |
1 |
| PrimeSource Building Products, Inc. | 331 |
1 |
| Stair-rite, LLC | 1 |
1 |
| Gardner Tech, LLC | 3 |
1 |
| VERBERNE, Gijs | 1 |
1 |
| WILLEMSEN, Johannes Cornelis | 1 |
1 |
| Other owners | 0 |