Trademarks = 1

Forward Citations = 123

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12 inventors (with patents filed for the assignee):

Charles M Blackburn (4 out of 4 patents)

Philip L Reid (3 out of 29 patents)

Daniel L Reuter (3 out of 3 patents)

4. Clifton W Heffner (3 out of 3 patents)

5. Robert T Stewart (2 out of 2 patents)

6. Sandy Hoover, Legal Representative (1 out of 1 patent)

7. Ravi C Krishnan (1 out of 2 patents)

8. Wendel C Green (1 out of 1 patent)

9. Russell E Cunningham (1 out of 1 patent)

10. Gordon S Light (1 out of 1 patent)

11. Patrick J Sharkitt (1 out of 1 patent)

12. Charles W Webster (1 out of 1 patent)

8 patents: Sort by Forward Citations

1. 7483769 - Method and apparatus for latent temperature control for a device under test (2009-01-27),

2. 6993418 - Method and apparatus for latent temperature control for a device under test (2006-01-31),

3. 6449534 - Method and apparatus for optimizing environmental temperature for a device under test (2002-09-10),

4. 4265074 - Web processing mechanism for forming packages (1981-05-05),

5. 4262474 - Web feeding system for package forming machine (1981-04-21),

6. 4262470 - Packaging system with cantilevered web feed system accessible for (1981-04-21),

7. 4180153 - High speed batch counting apparatus (1979-12-25),

8. 4153931 - Automatic library control apparatus (1979-05-08),

Company Overview

Sigma Systems Corporation is a leading provider of catalog-driven software solutions for communications, media, and high-tech companies. Their platform helps companies to rapidly launch innovative services, increase revenue, and improve customer experiences. Sigma Systems has over 30 years of experience and serves customers worldwide.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 6 2026

8 Patents

#9 in El Cajon, CA

#8,531 in California

#35,893 in US

El Cajon, CA, United States of America

Sigma Systems Corporation

Forward Citations = 123

12 inventors:

Charles M Blackburn (4 out of 4 patents)

Philip L Reid (3 out of 29 patents)

Daniel L Reuter (3 out of 3 patents)

4. Clifton W Heffner (3 out of 3 patents)

5. Robert T Stewart (2 out of 2 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Sigma Systems Corporation. Retrieved from https://idiyas.com/company/sigma-systems

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]