David E. Johnson — 5 Patents at Acterna

David E. Johnson has been granted 5 US patents while listed as an inventor at Acterna. The first was granted in 1985 and the most recent in November 2014. David E. Johnson ranks #907,971 of 4,157,543 US inventors in our database (top 21.8%). Patent records list David E. Johnson in Krumme Reihe, CA, US.

Issued Patents All Time

Showing 1–5 of 5 patents

Patent #	Title	Co-Inventors	Date
8878537	Method and apparatus to minimize gradient errors in buried utility depth measurements	Ross Edward Spain	2014-11-04
7938075	Automated seed detection and planting synchronization apparatus, method and system	Matthew K. Glendenning, Daniel Goldman, Jason J. Kelsick, David C. Smith	2011-05-10
7116760	System and method for single-ended line analysis for qualification and mapping	David R. Smith, Richard Liberman, Duane Eareckson, Paul Wyar	2006-10-03
4628265	Metal detector and classifier with automatic compensation for soil magnetic minerals and sensor misalignment	Richard Williams	1986-12-09
4514692	Metal detector and discriminator using differentiation for background signal suppression	Richard Williams	1985-04-30

David E. Johnson — 5 Patents

Issued Patents All Time

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