- All sections
- C - Chemistry; metallurgy
- C01B - Non-metallic elements; compounds thereof
- C01B 31/02 - Preparation of carbon; Purification
Patent holdings for IPC class C01B 31/02
Total number of patents in this class: 3575
10-year publication summary
|
454
|
399
|
114
|
25
|
7
|
11
|
2
|
3
|
0
|
0
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| National Institute of Advanced Industrial Science and Technology | 3677 |
88 |
| Hon Hai Precision Industry Co., Ltd. | 4157 |
58 |
| Tsinghua University | 5426 |
58 |
| Zeon Corporation | 3854 |
52 |
| NEC Corporation | 32703 |
47 |
| William Marsh Rice University | 937 |
40 |
| LG Chem, Ltd. | 17205 |
39 |
| Toray Industries, Inc. | 6652 |
39 |
| Massachusetts Institute of Technology | 9795 |
30 |
| Showa Denko K.K. | 2539 |
28 |
| Honda Motor Co., Ltd. | 24537 |
24 |
| The Regents of the University of California | 18943 |
24 |
| Fujitsu Limited | 19265 |
24 |
| Arkema France | 3790 |
24 |
| The University of Tokyo | 3903 |
24 |
| Centre National de La Recherche Scientifique | 9632 |
22 |
| TOYOTA JIDOSHA KABUSHIKI KAISHA (also trading as TOYOTA MOTOR CORPORATION) | 13301 |
22 |
| Nitto Denko Corporation | 7879 |
21 |
| Japan Science and Technology Agency | 1564 |
21 |
| Kuraray Co., Ltd. | 3392 |
20 |
| Other owners | 2870 |