Railroad mounted trench digger
CA 1256129 A · Owner: Loram Maintenance Of Way, Inc. · Inventors: Wahl, Raymond C.; Bull, Timothy B.H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A trench digger for digging and maintaining drainage ditches along railway road beds. The trench digger includes a compact rotary drum cutting head mounted on a boom that can be swung about a boom base pivot axis to position the cutting head to either side of a railroad mounted support carriage. A first conveyor carries loosened composite from the cutting head to a first conveyor discharge point rearwardly of the boom base pivot axis. A second conveyor pivotally mounted to the boom base at a second conveyor pivot axis oriented rearwardly of the boom base pivot axis receives the loosened composite from the first conveyor and conveys the loosened composite to a second conveyor discharge point …
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 June 20, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 20, 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.