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Copal Company Limited

USPTO Granted Patents = 192

% Expired Patents = 0.52

Trademarks = 2

Forward Citations = 1,530

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165 inventors (with patents filed for the assignee):

Nobuyoshi Inoue (24 out of 39 patents)

Yasuo Ishiguro (15 out of 16 patents)

Toshihisa Saito (14 out of 14 patents)

4. Katsuhiko Okabe (13 out of 13 patents)

5. Yukio Yoshikawa (10 out of 19 patents)

6. Shigekazu Nakamura (10 out of 10 patents)

7. Masaaki Takagi (9 out of 46 patents)

8. Tomio Kurosu (9 out of 19 patents)

9. Kenji Wakazono (9 out of 9 patents)

10. Munetaka Shimizu (9 out of 9 patents)

11. Kiyoyuki Arai (8 out of 8 patents)

12. Kunio Matsumoto (7 out of 10 patents)

13. Akira Suzuki (6 out of 154 patents)

14. Kunio Arisaka (4 out of 5 patents)

15. Noribumi Tachihara (4 out of 6 patents)

Core Competencies:

Focal Plane Shutter

Electromagnetic Shutter

Optical Sensor

Camera Shutter

Light Shielding Blade

Photographic Apparatus

Magnetic Disk Drive

Stepper Motor

Optical Displacement Detector

Printing Apparatus

Torque Sensor

Film Feeder

192 patents: Sort by Forward Citations

1. 6502296 - Method of fabricating a light-shielding blade composed of beryllium-aluminum alloy (2003-01-07),

2. 6317287 - Motor with output shaft having lead screw portion and pre-load generating mechanism (2001-11-13),

3. 6131840 - Mechanism for preventing uneven take-up of tape (2000-10-17),

4. 6001465 - Light shielding blade for camera made of para-orientation aromatic (1999-12-14),

5. 5943119 - Photographic developing/printing apparatus (1999-08-24),

6. 5917796 - Magneto-optical disk apparatus having an ejector arm and magnetic field (1999-06-29),

7. 5848844 - Fluid bearing (1998-12-15),

8. 5809676 - Sign display apparatus (1998-09-22),

9. 5775791 - Surface emission apparatus (1998-07-07),

10. 5771217 - Magneto-optical disk apparatus having a ejector arm and magnetic field (1998-06-23),

11. D388123 - Light-emitting diode indicator (1997-12-23),

12. 5699058 - Absolute encoder generating phase-shifted triangular waveforms to (1997-12-16),

13. 5669030 - Film feeder for automatic developing machine (1997-09-16),

14. 5600392 - Position sensor (1997-02-04),

15. 5539519 - Compact, high resolution optical displacement detector (1996-07-23),

Copal Company Limited, headquartered in Tokyo, Japan, specializes in advanced camera shutter technology. The company is known for its innovations in focal plane and electromagnetic shutters, which are essential components in modern photographic apparatus. Copal's expertise extends to optical sensors and light shielding blades, contributing significantly to the functionality and performance of imaging devices. Additionally, the company has a presence in the development of magnetic disk drives and stepper motors, showcasing its diverse technological capabilities.

Profile summary based on public USPTO records.

Company Badge

USPTO Data Jan 1 1976 - Oct 6 2026

192 Patents

#365 in Tokyo

#726 in Japan

#4,383 in the World

Copal Company Limited

Forward Citations = 1,530

165 inventors:

Nobuyoshi Inoue (24 out of 39 patents)

Yasuo Ishiguro (15 out of 16 patents)

Toshihisa Saito (14 out of 14 patents)

4. Katsuhiko Okabe (13 out of 13 patents)

5. Yukio Yoshikawa (10 out of 19 patents)

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