% Expired Patents = 20.0

Forward Citations = 71

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11 inventors (with patents filed for the assignee):

Mark H Helmick (7 out of 10 patents)

William J Gervais (4 out of 9 patents)

William J Lurie (3 out of 3 patents)

4. William R Brennan, Jr (1 out of 20 patents)

5. William H Vermeer (1 out of 3 patents)

6. Thomas J Studebaker (1 out of 10 patents)

7. Chad A Follmar (1 out of 1 patent)

8. Everette C Van Wert (1 out of 2 patents)

9. John R Cogley, Jr (1 out of 1 patent)

10. Richard A Nelson (1 out of 1 patent)

11. William J Lurie, Jr (1 out of 1 patent)

10 patents: Sort by Forward Citations

1. D692426 - Touchless pointing device (2013-10-29),

2. D649152 - Touchless pointing device (2011-11-22),

3. 7181313 - Scalable composite rectangular/cylindrical automated data storage library system (2007-02-20),

4. 6762905 - High density tape library system (2004-07-13),

5. 6560061 - High density tape library system (2003-05-06),

6. 6381089 - Tape cassette storage and accessing system with closely spaced layered cassettes (2002-04-30),

7. 6271982 - Automated precision cassette handling system (2001-08-07),

8. D392147 - Simplified tape cartridge rack (1998-03-17),

9. 5014141 - Low profile, high-capacity streaming tape drive (1991-05-07),

10. 4893312 - Compact, real time tape drive system (1990-01-09),

Company Overview

Qualstar Corporation, based in Simi Valley, California, specializes in the design and manufacture of high-performance data storage solutions and power management systems. The company is known for its innovative tape storage technology, which serves various industries, including enterprise data centers and cloud computing. Qualstar's expertise extends to developing efficient power supplies and battery systems, contributing to advancements in energy management and reliability across diverse applications.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 6 2026

10 Patents

#11 in Simi Valley, CA

#7,108 in California

#29,839 in US

#55,986 in the World

Simi Valley, CA, United States of America

Qualstar Corporation

Forward Citations = 71

11 inventors:

Mark H Helmick (7 out of 10 patents)

William J Gervais (4 out of 9 patents)

William J Lurie (3 out of 3 patents)

4. William R Brennan, Jr (1 out of 20 patents)

5. William H Vermeer (1 out of 3 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Qualstar Corporation. Retrieved from https://idiyas.com/company/qualstar

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]