Pipeline padding system
CA 2022668 C · Owner: Klamar, Ed · Inventors: Klamar, Ed
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Backfilling apparatus adapted to be moved along a trench by a tractor includes a chassis a hitch, attachable to the chassis on either side hydraulic, cylinder for varying the attitude of the chassis to the hitch, a hopper mounted on the chassis to receive backfilling material, a variable speed conveyor carrying backfilling material from the hopper to an elevated position, a shredder accepting material from the conveyor, an inclined vibrating screen receiving shredded material and discharging padding fill onto the pipe in the trench and oversize material onto the padding fill in the trench. A grizzly at the hopper mouth can be positioned to discharge large masses of fill on either side or …
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 3, 1990 and granted February 27, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 3, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 3, 2012.
- 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.