Patents Assigned to John Gjerde AS
  • AIR VENT HEAD
    Publication number: 20150013779
    Abstract: The present invention relates to a valve providing air ventilation in and out of ballast tanks in ships, and especially to an air vent head providing free flow of air in and out of ballast tanks while at the same time prevents seawater to enter uncontrollably into the ballast tanks via the air inlet.
    Type: Application
    Filed: February 15, 2013
    Publication date: January 15, 2015
    Applicant: John Gjerde AS
    Inventors: Maron Gunnar Sandvik, Roger Gjerde