Forward Citations = 90

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3 inventors (with patents filed for the assignee):

Rory A Smith (1 out of 6 patents)

Mervin L Grindahl (1 out of 12 patents)

Keith W Barnes (1 out of 68 patents)

1 patent: Sort by Forward Citations

1. 6374115 - Method and apparatus for trunked radio repeater communications with backwards compatibility (2002-04-16),

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USPTO Data Jan 1 1976 - Oct 13 2026

1 Patents

#6 in Waseca, MN

#3,566 in Minnesota

#136,844 in US

Waseca, MN, United States of America

Transcrypt International/e.f. Johnson

Forward Citations = 90

3 inventors:

Rory A Smith (1 out of 6 patents)

Mervin L Grindahl (1 out of 12 patents)

Keith W Barnes (1 out of 68 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Transcrypt International/e.f. Johnson. Retrieved from https://idiyas.com/company/transcrypt-international-e-f-johnson

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]