- All sections
- B - Performing operationstransporting
- B28B - Shaping clay or other ceramic compositionsshaping slagshaping mixtures containing cementitious material, e.g. plaster
- B28B 21/88 - Cores adjustable, collapsible or expansible
Patent holdings for IPC class B28B 21/88
Total number of patents in this class: 21
10-year publication summary
|
2
|
1
|
1
|
2
|
2
|
4
|
1
|
1
|
1
|
0
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Watt Fuel Cell Corp. | 155 |
6 |
| 161508 Canada Inc. | 4 |
2 |
| Vulco, S.A. | 56 |
2 |
| Giken Ltd. | 50 |
2 |
| COR Engineering Limited | 2 |
1 |
| Hawkeyepedershaab Concrete Technologies, Inc. | 28 |
1 |
| II-VI Delaware, Inc. | 1717 |
1 |
| Lancer Systems L.P. | 12 |
1 |
| Schlusselbauer, Johann | 5 |
1 |
| Weir Minerals Australia, Ltd. | 304 |
1 |
| Schlusselbauer, Ulrich | 5 |
1 |
| ST Engineering Aerospace Ltd. | 38 |
1 |
| Qingdao University of Technology | 593 |
1 |
| Other owners | 0 |