John Gjerde AS
John Gjerde AS Patent applications | ||
Patent application number | Title | Published |
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20150013779 | AIR VENT HEAD - 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. | 01-15-2015 |