Ovax (anti-ovalization pipe)
CA 2212290 A1 · Owner: Cotnoir, Stephane · Inventors: Cotnoir, Stephane
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In the field of undergorund piping, pipes are generally thought of as being circular. In this invention the pipe is not circular in shape: while the bottom half is indeed semicircular in shape the top half is in the shape of a pointed arch or ogive (see description and drawings). This shape makes it possible to reduce the cylindrical deformation or ovalizing effect caused by pressure exerted by the ground or by vertically-applied pressure.
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 August 26, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 26, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 26, 2019.
- 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.