Breakaway utility pole shear base structure
CA 1301425 C · Owner: Lewis, John R. Jr. · Inventors: Lewis, John R. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A breakaway utility polo structure having a tubular base (II) anchored in the ground substantially at ground level and adapted to telescopically securethe bottom end portion of a polo (9) the base (II) having a circumferential shear groove (20) adjacent to its bottom end and the base being secured in the base byadhesive material (12) and by bolts (21) spaced above the shear groove (20) saidshear groove adapted to cause failure of the base when the pole is subjected to horizontal impact at a predetermined distance above ground level from a vehicle of predetermined weight moving horizontally at a predetermined minimum speed.
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 26, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 26, 2009.
- 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.