Corrugated pipe structure
CA 2426524 A1 · Owner: Toliver, Timothy R. · Inventors: Toliver, Timothy R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pipe structure (10) includes an annular corrugation (26) centered on an axis (30). The corrugation (26) has a cylindrical liner (32) centered on the axis (30), two annular sidewalls (36) extending radially outward from axially opposite ends of the liner (32), and an annular crown (38) extending axially between radially outer ends of the sidewalls (36). An annular cavity (60) is centered on the axis (30) and is bounded by the liner (32) the sidewalls (36) , and the crown (38). A structural filler (74) is contained within the cavity (60).
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 November 6, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 6, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 6, 2023.
- 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.