Growing community of inventors

Brooklyn Center, MN, United States of America

Roger M Johnson

Average Co-Inventor Count = 5.62

ph-index = 2

The patent ph-index is calculated by counting the number of publications for which an author has been cited by other authors at least that same number of times.

Forward Citations = 16

Roger M JohnsonDale R Duvall (2 patents)Roger M JohnsonPatrick J Gilligan (2 patents)Roger M JohnsonLarry D McClellan (2 patents)Roger M JohnsonCharles Swanson (2 patents)Roger M JohnsonJerry W Lindenfelser (2 patents)Roger M JohnsonJerome W Lindenfelser (1 patent)Roger M JohnsonDenis L Larson (1 patent)Roger M JohnsonRolf D Ingersoll (1 patent)Roger M JohnsonLarry D McClelland (1 patent)Roger M JohnsonRoger M Johnson (3 patents)Dale R DuvallDale R Duvall (11 patents)Patrick J GilliganPatrick J Gilligan (6 patents)Larry D McClellanLarry D McClellan (3 patents)Charles SwansonCharles Swanson (2 patents)Jerry W LindenfelserJerry W Lindenfelser (2 patents)Jerome W LindenfelserJerome W Lindenfelser (5 patents)Denis L LarsonDenis L Larson (1 patent)Rolf D IngersollRolf D Ingersoll (1 patent)Larry D McClellandLarry D McClelland (1 patent)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Photo Control Corporation (3 from 8 patents)


3 patents:

1. 5812895 - Camera with negative identification system

2. 5329325 - Synchronized zoom electronic camera system

3. 5294950 - Identification system for automated film and order processing including

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as of
12/19/2025
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