% Expired Patents = 80.0

Forward Citations = 7

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6 inventors (with patents filed for the assignee):

Wen T Lin (2 out of 4 patents)

Chung-Jung Huang (1 out of 6 patents)

Chao-Tung Yang (1 out of 16 patents)

4. Shao-Hsuan Hung (1 out of 1 patent)

5. Shih-Wei Chang (1 out of 4 patents)

6. Tsai-Sheng Kao (1 out of 1 patent)

5 patents: Sort by Forward Citations

1. 8781048 - Apparatus for synchronization of audio data and visual data and method therefor (2014-07-15),

2. 8693951 - Wireless audio frequency playing apparatus and wireless playing system using the same (2014-04-08),

3. 7817459 - Depletion-mode MOSFET circuit and applications (2010-10-19),

4. 7639048 - System and method of detecting a phase, a frequency and an arrival-time difference between signals (2009-12-29),

5. 7613269 - Method for calculating equal error protection profiles (2009-11-03),

Company Overview

Keystone Semiconductor Inc. is a leading provider of solutions for the semiconductor industry. With a focus on innovation and cutting-edge technology, Keystone offers a wide range of products and services to meet the needs of its customers. From design to production, Keystone Semiconductor Inc. is committed to delivering high-quality solutions that drive success for its clients.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 13 2026

5 Patents

#4 in Spring House, PA

#1,871 in Pennsylvania

#51,620 in US

Spring House, PA, United States of America

Keystone Semiconductor Inc.

Forward Citations = 7

6 inventors:

Wen T Lin (2 out of 4 patents)

Chung-Jung Huang (1 out of 6 patents)

Chao-Tung Yang (1 out of 16 patents)

4. Shao-Hsuan Hung (1 out of 1 patent)

5. Shih-Wei Chang (1 out of 4 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Keystone Semiconductor Inc.. Retrieved from https://idiyas.com/company/keystone-semiconductor

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]