Plough
CA 1187297 A · Owner: British Petroleum Company P.L.C. (The) · Inventors: Reece, Alan R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A plough for burying cable or pipe comprises at least two cutters laterally spaced apart, one being offset at an angle relative to the other for making two spaced apart cuts in a substrate to form a wedge of material. Means are provided for lifting and moving the wedge upwards and sideways to form a trench and for guiding the cable or pipe into the trench under the lifted wedge. The plough cuts an improved furrow shape lifts the furrow slice, through the minimum height in order to permit the cable or pipe to be inserted below it and allows the material to be replaced with minimum disturbence.
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
- Granted May 21, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 21, 2002.
- 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.