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For the Inventor, By the Inventor

Changhua, Taiwan

Sdi Corporation


USPTO Granted Patents = 62

% Expired Patents = 35.5



Trademarks = 18

Forward Citations = 423

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29 inventors (with patents filed for the assignee):

goldMedal Chien-Lung Wu (13 out of 13 patents)

silverMedal Joshua James Cheetham (10 out of 24 patents)

bronzeMedal Szu-Yu Chen (10 out of 10 patents)

4.  Jau-Shyong Chen (8 out of 8 patents)

5.  Cheng-Yu Pai (3 out of 3 patents)

6.  Chih-Wei Hsu (3 out of 3 patents)

7.  Hsien-Cheng Lin (3 out of 3 patents)

8.  I-Hui Liu (3 out of 3 patents)

9.  Cheng-Loung Wu (3 out of 3 patents)

10.  Ching-Li Chen (2 out of 2 patents)

11.  Yao-Chia Chu (2 out of 2 patents)

12.  Chien-Hsing Chang (2 out of 2 patents)

13.  Chi-Cheng Hung (2 out of 2 patents)

14.  Long-Jyi Yeh (2 out of 2 patents)

15.  Chiu-Hung Chung (2 out of 2 patents)


Core Competencies:
Dual-Mode Stapler
Electric Pencil Sharpener
Cutter Assembly
Thin Film Dispenser
Correction Tape Dispenser
Pressure Regulating Device
Cutter Knife
Pencil Sharpener
Lead Frame
Dental Capsule
Utility Knife
Paper Punch

62 patents:

1. 12466045 - Dual-mode stapler (2025-11-11),
2. 10828928 - Writing tool and dispensing unit thereof (2020-11-10),
3. 10569594 - Writing tool (2020-02-25),
4. 10414201 - Pressure regulating device for writing tool and writing tool having the same (2019-09-17),
5. 10035249 - Stapler and multi-inclined anvil structure thereof (2018-07-31),
6. 9969207 - Reciprocating pencil sharpener (2018-05-15),
7. 9694624 - Automatic cover-opening device (2017-07-04),
8. 9653385 - Lead frame (2017-05-16),
9. 9623572 - Cutter assembly having a screw-locking device (2017-04-18),
10. 9555661 - Electric pencil sharpener with a replaceable cutter assembly (2017-01-31),
11. 9457483 - Cutter assembly having dual locking effect (2016-10-04),
12. 9352928 - Thin film dispenser (2016-05-31),
13. 9248691 - Adjustable pencil sharpener (2016-02-02),
14. 9227460 - Reciprocating pencil sharpener (2016-01-05),
15. 9162363 - Cutter with a slider that can be pushed from two directions and slider for the same (2015-10-20),
Sdi Corporation, based in Changhua, Taiwan, specializes in the development and manufacturing of innovative writing tools. The company focuses on a diverse range of products, including dual-mode staplers, electric pencil sharpeners, and various dispensing devices. Sdi Corporation is committed to enhancing user experience through advanced technology in office supplies, ensuring quality and functionality in everyday writing instruments. Their expertise extends to precision components like cutter assemblies and pressure regulating devices, positioning them as a key player in the writing tools sector.
Profile summary based on public USPTO records.

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USPTO Data Jan 1 1976 - Sep 29 2026

62 Patents

#7 in Changhua

#343 in Taiwan

#11,755 in the World

Changhua, TW
Changhua, Taiwan

Sdi Corporation

Forward Citations = 423

29 inventors:

goldMedal Chien-Lung Wu (13 out of 13 patents)

silverMedal Joshua James Cheetham (10 out of 24 patents)

bronzeMedal Szu-Yu Chen (10 out of 10 patents)

4.  Jau-Shyong Chen (8 out of 8 patents)

5.  Cheng-Yu Pai (3 out of 3 patents)

Please report any incorrect information to [email protected]
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