Boat hull construction
CA 2175544 C · Owner: Friesen, Henry · Inventors: Friesen, John; Friesen, Jake; Friesen, Henry
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A boat hull is constructed of inner and outer aluminum skin layers. A foam material and a plurality of spaced frame members are sandwiched between the two skin layers. The skin layers are directly welded to the spaced frame members which preferably are spaced apart at close intervals to ensure structural integrity, and product performance. A preferred method of constructing a boat hull designed according to this invention includes providing a temporary support structure that is connected to longitudinal beams of the boat hull frame. After spaced frame members are connected to the longitudinal beams a first skin layer is attached. The temporary support structure is then removed and the …
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 May 1, 1996 and granted October 19, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 1, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 1, 2018.
- 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.