- All sections
- B - Performing operationstransporting
- B31B - Making containers of paper, cardboard or material worked in a manner analogous to paper
- B31B 50/81 - Forming or attaching accessories, e.g. opening devices, closures or tear strings
Patent holdings for IPC class B31B 50/81
Total number of patents in this class: 173
10-year publication summary
|
19
|
28
|
30
|
20
|
9
|
13
|
11
|
21
|
10
|
6
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| WestRock Shared Services, LLC | 563 |
16 |
| Altria Client Services LLC | 2172 |
10 |
| Sonoco Development, Inc. | 592 |
10 |
| Graphic Packaging International, LLC | 1465 |
10 |
| Packsize LLC | 295 |
5 |
| Primapak, LLC | 79 |
5 |
| Totani Corporation | 118 |
4 |
| Pratt Retail Specialties, LLC | 77 |
4 |
| C.M.C. S.p.A. | 35 |
3 |
| Daio Paper Corporation | 1383 |
3 |
| I.M.A. Industria Macchine Automatiche S.p.A. | 467 |
3 |
| Otor | 27 |
3 |
| Paper Machinery Corporation | 14 |
3 |
| Polytex Fibers Corporation | 28 |
3 |
| Illinois Tool Works Inc. | 11409 |
2 |
| Philip Morris Products S.A. | 7527 |
2 |
| EMD Millipore Corporation | 649 |
2 |
| Airlite Plastics Co. | 92 |
2 |
| British American Tobacco (Investments) Limited | 1029 |
2 |
| Cascades Canada ULC | 618 |
2 |
| Other owners | 79 |