- All sections
- G - Physics
- G03B - Apparatus or arrangements for taking photographs or for projecting or viewing them; apparatus or arrangements employing analogous techniques using waves other than optical waves; accessories therefor
- G03B 21/28 - Reflectors in projection beam
Patent holdings for IPC class G03B 21/28
Total number of patents in this class: 1393
10-year publication summary
108
|
109
|
90
|
148
|
146
|
121
|
98
|
81
|
60
|
13
|
2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
Owner |
All patents
|
This class
|
---|---|---|
Seiko Epson Corporation | 18724 |
134 |
FUJIFILM Corporation | 27102 |
76 |
Ricoh Company, Ltd. | 13266 |
73 |
Maxell, Ltd. | 2533 |
48 |
Coretronic Corporation | 1165 |
47 |
Maxell Holdings, Ltd. | 1422 |
47 |
Sony Corporation | 32931 |
41 |
Texas Instruments Incorporated | 19376 |
32 |
3m Innovative Properties Company | 18406 |
27 |
Panasonic Intellectual Property Management Co., Ltd. | 27812 |
25 |
Casio Computer Co., Ltd. | 3343 |
22 |
Appotronics Corporation Limited | 1111 |
20 |
Young Optics Inc. | 247 |
20 |
Iview Displays (Shenzhen) Company Ltd. | 198 |
20 |
Dolby Laboratories Licensing Corporation | 3883 |
19 |
Delta Electronics, Inc. | 2401 |
17 |
Sanyo Electric Co., Ltd. | 3926 |
15 |
Canon Inc. | 36841 |
14 |
Google LLC | 38759 |
14 |
Qisda Corporation | 392 |
14 |
Other owners | 668 |