Castors
CA 2002610 A1 · Owner: Herok-Rjk Limited · Inventors: Hicks, Robert James; France, Paul Stanley
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides a castor wheel assembly 10 in which the swivel or castor axis 16 is locked when the wheel 11 is in the straight ahead position but, unlocked in any other position of motion locking, being caused by forward rotation of the wheel and released by backward rotation both without any braking action on the wheel. A supermarket trolley or similar vehicle equipped with a pair of such castors at the front end and conventional castors at the rear can be steered under normal circumstances by the rear castors but readily adapted to four wheel steering in confined spaced by slight reverse motion to unlock the front wheels' castor action. (Figure 5)
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 November 9, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 9, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 9, 2011.
- 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.