Trench-digging machine
CA 1257615 A · Owner: Trancheuses Dalen · Inventors: Dalaine, Jean-Charles
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Jean-Charles DALAINE, "TRENCH-DIGGING MACHINE" PRIORITY: 18 November 1985 - French patent 85 16983 in the name of the Applicant, The trencher comprises a vehicle (1) having secured to its rear a boom (3) around which a digging chain (4) runs. The boom (3) is slidingly disposed in a sleeve-like frame (5) pivoted to the rear of the vehicle (1) and movable between an operative position and a raised transport position. Of use for digging trenches. See Fig. 1.
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 July 18, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 18, 2006.
- 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.