Guardrail
CA 2539617 C · Owner: James, Dallas · Inventors: James, Dallas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An impact head for a road guardrail (1) including cable routing means (2) adapted to form a convoluted path through which a cable can be threaded. The convoluted path that the cables (15) must follow through the impact head of the invention restricts movement of the cable (15) through the head thereby , providing sufficient friction to slow down the movement of the impact head during a vehicle impact. Also disclosed is a method of constructing a guardrail including the steps of slidably interconnecting a plurality of rails and attaching them to posts, positioning the impact head as claimed at one end of the slidably interconnected rails, threading at least one cable through 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
- Filed September 22, 2004 and granted June 5, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 22, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 22, 2026.
- 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.