% Expired Patents = 50.0

Forward Citations = 44

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4 inventors (with patents filed for the assignee):

Francis K King (14 out of 23 patents)

Jeffrey F Liu (12 out of 14 patents)

Shand-Ling Mao (2 out of 4 patents)

4. Ranvir Koshal (1 out of 1 patent)

14 patents: Sort by Forward Citations

1. 7336569 - Optical disk tracking servo circuit enabled to compensate for non-continuous track segments or prolonged defect (2008-02-26),

2. 7334733 - Data access device using rotational head to access data stored in data strips and data arc segments or data circles (2008-02-26),

3. 7185814 - Layer structure and method of manufacture for optical memory strip (OMS) (2007-03-06),

4. 6934098 - Data card with a full circular track for alignment and amplitude calibration (2005-08-23),

5. 6775080 - Data access device implemented with open and closed control loops to access data stored in discrete stepwise segments (2004-08-10),

6. 6728059 - Magnetic data card servo writer (2004-04-27),

7. 6588671 - Positioning of a recording head for a data storage device (2003-07-08),

8. 6545831 - Servo-sector arrangement over several data arcs for a rotational head data recording and retrieving system (2003-04-08),

9. 6502755 - Optical data storage card (2003-01-07),

10. 6499659 - Pulse shaping for a transformer coupled read/write recording device (2002-12-31),

11. 6417980 - Magnetic data card servo writer (2002-07-09),

12. 6339569 - Optical data card servo writer (2002-01-15),

13. 6311893 - Optical data access system with data card reader having a single rotational moving pickup head (2001-11-06),

14. 6307709 - Magnetic data storage card (2001-10-23),

Company Overview

Dcard, Inc. is a technology company based in Milpitas, California, specializing in innovative solutions for digital communication and social networking. The organization focuses on developing platforms that enhance user interaction and engagement, leveraging advanced algorithms and user-centric design principles. With a commitment to fostering community and connectivity, Dcard aims to redefine how individuals share experiences and information in the digital landscape, catering to a diverse audience across various regions.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 13 2026

14 Patents

#90 in Milpitas, CA

#5,318 in California

#22,319 in US

#42,249 in the World

Milpitas, CA, United States of America

Dcard, Inc.

Forward Citations = 44

4 inventors:

Francis K King (14 out of 23 patents)

Jeffrey F Liu (12 out of 14 patents)

Shand-Ling Mao (2 out of 4 patents)

4. Ranvir Koshal (1 out of 1 patent)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Dcard, Inc.. Retrieved from https://idiyas.com/company/dcard

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]