Trenching device
CA 1290772 C · Owner: Capitol Trencher Corporation · Inventors: Umberson, Gerald Edward
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A trenching apparatus is disclosed which has a vehicle having a power train comprising at least an engine transmission and power output shaft from said transmission; a motive system for moving the vehicle; an adjustable boom assembly attached to the vehicle; a cutting wheel rotatably attached to the boom assembly; and drive means connecting the cutting wheel to the power train for causing the cutting wheel to rotate. The improvement lies in a torsional limiting device connected between the power train and the drive means, the device comprising a planetary ring gear assembly having a sun gear jounaled in the device a planet gear, rotatable on a planet carrier journaled in the device the, …
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 October 15, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 15, 2008.
- 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.