Forward Citations = 51

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4 inventors (with patents filed for the assignee):

David H Johnston (2 out of 4 patents)

Pravin K Patel (2 out of 3 patents)

John Makaeff (1 out of 1 patent)

4. John Makaeff, Deceased (1 out of 1 patent)

2 patents: Sort by Forward Citations

1. 4224381 - Abrasion resistant magnetic record members (1980-09-23),

2. 4124736 - Surface protected magnetic recording members (1978-11-07),

Company Badge

USPTO Data Jan 1 1976 - Oct 13 2026

2 Patents

#200 in Torrance, CA

#21,008 in California

#94,841 in US

Torrance, CA, United States of America

Poly-Disc Systems, Inc.

Forward Citations = 51

4 inventors:

David H Johnston (2 out of 4 patents)

Pravin K Patel (2 out of 3 patents)

John Makaeff (1 out of 1 patent)

4. John Makaeff, Deceased (1 out of 1 patent)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Poly-Disc Systems, Inc.. Retrieved from https://idiyas.com/company/poly-disc-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]