- 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: 181
10-year publication summary
|
3
|
1
|
2
|
3
|
0
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2
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0
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0
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2
|
0
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| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Panasonic Corporation | 20327 |
19 |
| Nippon Kayaku Kabushiki Kaisha | 1427 |
19 |
| Sony Corporation | 31565 |
17 |
| Matsushita Electric Industrial Co., Ltd. | 2934 |
12 |
| DIC Corporation | 3659 |
12 |
| Ricoh Company, Ltd. | 13205 |
11 |
| Mitsubishi Kagaku Media Co., Ltd. | 39 |
11 |
| FUJIFILM Corporation | 28506 |
7 |
| Thomson Licensing | 3807 |
6 |
| Lintec Corporation | 1937 |
6 |
| NEC Corporation | 34337 |
4 |
| Pioneer Corporation | 4650 |
4 |
| Mitsubishi Chemical Corporation | 4438 |
4 |
| Nippon Mining & Metals Co., Ltd. | 138 |
4 |
| Panasonic Intellectual Property Management Co., Ltd. | 29620 |
3 |
| JX Nippon Mining & Metals Corporation | 1526 |
3 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2905 |
3 |
| Mitsubishi Materials Corporation | 2408 |
3 |
| Mitsubishi Plastics, Inc. | 334 |
3 |
| Taiyo Yuden Co., Ltd. | 1888 |
3 |
| Other owners | 27 |