A ring binder mechanism
CA 2272496 A1 · Owner: World Wide Stationery Manufacturing Company Limited · Inventors: Pi, Jin Biao
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is disclosed a ring binder mechanism to be secured to a cover the , mechanism, including a pair of plates mounted with a number of half rings the plates , being, retained by a number of wires for pivotal movement between a position in which the, half rings are open, and a position in which the half rings are closed and , two levers, which may be moved to pivot the plates between the two positions each of the , plates, including a protrusion received within a respective hole aperture of the lever to allow, the lever to pivot relative to the plates.
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 May 21, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 21, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 21, 2021.
- 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.