- All sections
- G - Physics
- G11B - Information storage based on relative movement between record carrier and transducer
- G11B 7/257 - Record carriers characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers, sensitising layers or dielectric layers which are protecting the recording layers
Patent holdings for IPC class G11B 7/257
Total number of patents in this class: 201
10-year publication summary
|
5
|
3
|
1
|
2
|
3
|
0
|
2
|
0
|
0
|
0
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Nippon Kayaku Kabushiki Kaisha | 1400 |
20 |
| Panasonic Corporation | 20786 |
19 |
| Sony Corporation | 32931 |
18 |
| Matsushita Electric Industrial Co., Ltd. | 4724 |
18 |
| Ricoh Company, Ltd. | 13266 |
13 |
| Mitsubishi Kagaku Media Co., Ltd. | 42 |
12 |
| DIC Corporation | 3597 |
12 |
| FUJIFILM Corporation | 27102 |
10 |
| Lintec Corporation | 1915 |
7 |
| Thomson Licensing | 4027 |
6 |
| NEC Corporation | 32703 |
5 |
| Pioneer Corporation | 4843 |
4 |
| Mitsubishi Chemical Corporation | 4313 |
4 |
| Nippon Mining & Metals Co., Ltd. | 161 |
4 |
| Koninklijke Philips Electronics N.V. | 13133 |
3 |
| Panasonic Intellectual Property Management Co., Ltd. | 27812 |
3 |
| JX Nippon Mining & Metals Corporation | 1576 |
3 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2865 |
3 |
| Mitsubishi Materials Corporation | 2378 |
3 |
| Mitsubishi Plastics, Inc. | 347 |
3 |
| Other owners | 31 |