Patent & IP news archive

Complaint for Patent Infringement
Civil Action No. 1:12-cv-01331; no judge yet assigned.
Filed on Dec. 5, 2012 in the U.S. District Court for the Western District of Michigan;


Hach Company
Miller Johnson PLC; Grand Rapids, MI
David J. Gass

Patents in case

  • 5,811,688: “Open channel flowmeter utilizing surface velocity and lookdown level devices” by Marsh et. al. Prosecuted by Laubscher & Laubscher. Includes 47 claims (2 indep.). Was application 08/787,094. Granted 9/22/1998.

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Case documents (PDF)

Fig. 1 from 5,811,688

5,811,688 figure 1

Litigant weblinks

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