Doorknob cover capable of attracting or being attracted magnetically
CA 2515047 A1 · Owner: Chiu, Shyue-Ding · Inventors: Chiu, Shyue-Ding
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A doorknob cover (20) comprise a hollow cylindrical body and an element (40) which is capable of attracting magnetically or being attracted magnetically. The cylindrical body is provided in one side with an elastic opening and in , other side with the element. The doorknob cover is fitted over the doorknob via the elastic opening. As the door is swiveled toward a wall the doorknob , is arrested by a magnetic seat (M) of the wall due to the magnetic attraction between the element of the doorknob and the magnetic seat of the wall.
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 February 5, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 5, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 5, 2025.
- 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.