Buoyancy device and method for using same
CA 2277782 A1 · Owner: Bull, Henrik · Inventors: Bull, Henrik; Ingebretsen, Helge
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and a buoyancy device (2) adapted to impart buoyancy to at least one longitudinal element (1) submerged in water. The buoyancy device (2) is hollow and is preferably made of plastics or a similar corrosion resistant material. The device is preferably produced as one single unit but may include several , separate chambers (12 16, 17) which, via valves (13) may be brought in communicating connection with the surroundings in a controlled manner. The , device (2) will no be exposed to large differential pressures during use and , accordingly may have a relatively thin wall. The buoyancy device (2) has a much smaller weight than existing buoys is much simpler to assemble than , …
Read the whole patent
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 January 13, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 13, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 13, 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.