Post hole liner
CA 2084744 A1 · Owner: Robinson, S. Eric · Inventors: Robinson, S. Eric
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cylindrical post hole liner is described with a, cap, preferably integral with the cylinder across the upper, end thereof. The cap is readily removable but only by means, of a tool, such as a hand saw. For example the cylinder may, be provided with radial slots just below the cap portion thereof, so that the cap may be easily removed simply by inserting a hand saw in the slots and using it to cut through the remaining plastic to join the slots and thereby separate the cap from the cylinder. Preferably, lifting holes are provided through the wall of the cylinder near the top to, facilitate lifting, moving, installing and aligning the liner. The bottom of the liner may be entirely open but …
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 December 7, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 7, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 7, 2014.
- 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.