Forward Citations = 41

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3 inventors (with patents filed for the assignee):

Duane E Cummings (3 out of 7 patents)

Raphael J Marzean (2 out of 5 patents)

Gregory R Johnson (2 out of 2 patents)

3 patents: Sort by Forward Citations

1. D400450 - Dash mounted sonar depth indicator (1998-11-03),

2. D394405 - Gimbal mounted sonar depth indicator (1998-05-19),

3. 5459479 - Solid state depth locator having liquid crystal display (1995-10-17),

Company Badge

USPTO Data Jan 1 1976 - Oct 6 2026

3 Patents

#5 in Monticello, MN

#1,979 in Minnesota

#73,815 in US

Monticello, MN, United States of America

Marcum Enterprises Incorporated

Forward Citations = 41

3 inventors:

Duane E Cummings (3 out of 7 patents)

Raphael J Marzean (2 out of 5 patents)

Gregory R Johnson (2 out of 2 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Marcum Enterprises Incorporated. Retrieved from https://idiyas.com/company/marcum-enterprises

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]