Castor locking device
CA 2197772 A1 · Owner: Carpenter, Graham Scott · Inventors: Carpenter, Graham Scott
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A device for arresting the swivelling movement of a castor (3) especially those on the front of shopping trolleys comprises a plate (10) secured to the base of the trolley and a tongue adapted to pivot (12) between first and second positions (11 11A). In the first position, the tongue is engaged between the arms of the fork member (4) to prevent swivelling movement of the castor (3). In the second position (11A) the tongue is disengaged from between the arms to permit swivelling movement of the castor (3). The tongue may be automatically disengaged by contact of another trolley with an arm (15) connected to the tongue.
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 August 17, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 17, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 17, 2016.
- 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.