% Expired Patents = 20.0

Forward Citations = 232

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12 inventors (with patents filed for the assignee):

John R Powell (3 out of 5 patents)

Daniel J Ehntholt (3 out of 6 patents)

Eric J Carlson (3 out of 7 patents)

4. James R Valentine (3 out of 12 patents)

5. Irwin C Winkler (3 out of 4 patents)

6. Philip E Rollhaus (3 out of 6 patents)

7. Christopher J Marmo (3 out of 3 patents)

8. Charles M Zepp (2 out of 57 patents)

9. Nabil M Lawandy (2 out of 95 patents)

10. Marianne Krieg-Kowald (1 out of 8 patents)

11. Andrei Smuk (1 out of 8 patents)

12. Kenneth S Norland (1 out of 11 patents)

5 patents: Sort by Forward Citations

1. 6531262 - Methods and apparatus for rendering an optically encoded medium unreadable and tamper-resistant (2003-03-11),

2. 6434109 - Machine-readable optical disc with reading-inhibit agent (2002-08-13),

3. 6343063 - Machine-readable optical disc with reading-inhibit agent (2002-01-29),

4. 6338933 - Methods and apparatus for rendering an optically encoded medium unreadable (2002-01-15),

5. 6011772 - Machine-readable optical disc with reading-inhibit agent (2000-01-04),

Company Overview

Spectradisc Corporation is a leading provider of optical storage solutions for the healthcare, finance, and government sectors. With a focus on data security and storage reliability, Spectradisc offers a range of archival and backup storage products, including recordable optical discs and drives. The company is known for its cutting-edge technology and commitment to customer satisfaction.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 6 2026

5 Patents

#55 in Providence, RI

#224 in Rhode Island

#51,570 in US

Providence, RI, United States of America

Spectradisc Corporation

Forward Citations = 232

12 inventors:

John R Powell (3 out of 5 patents)

Daniel J Ehntholt (3 out of 6 patents)

Eric J Carlson (3 out of 7 patents)

4. James R Valentine (3 out of 12 patents)

5. Irwin C Winkler (3 out of 4 patents)

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

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]