Magnetic lifting apparatus
CA 2111428 C · Owner: Jung, Hyung · Inventors: Jung, Dong Won
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A magnetic lifting apparatus includes a plurality of magnetic substances, a plurality of pairs of first permanent magnets, a plurality of rotors having a pair of second permanent magnets, respectively and an on/off, switch handle connected to the rotors whereby upon rotating the on/off switch handle, the magnetic apparatus has a magnetic activity or not so as to attach to or release from the object.
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 December 14, 1993 and granted November 11, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 14, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 14, 2015.
- 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.