Method and apparatus for exchanging ballast water in a ship
CA 2356889 A1 · Owner: Numata, Hisashi · Inventors: Tamashima, Masahiro; Numata, Hisashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A system for automatically replacing ballast water in a ballast tank (6) of a ship (5) comprises a water inlet port (11) on a part of the ship where the water pressure acting on the ship when in forward motion in the water is higher than the pressure of the ballast water being replaced a water , discharge outlet (14) in the ballast tank and a water inlet passage (12) extending between the water inlet port (11) and the ballast tank (6) for introducing water into the ballast tank at a higher pressure than the ballast water in the tank. In this way the ballast water is forced from the ballast tank through the discharge outlet (14) to be replaced by water introduced through the inlet …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed December 28, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 28, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 28, 2020.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.