Lock assembly with curved keyway
CA 2183790 C · Owner: Hsu, Yun-Tung · Inventors: Hsu, Yun-Tung
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A flexible key for use with a lock body provided with a longitudinal curved keyway and having a cross-section that is shaped to have an upright first portion and a cross-wise second portion. The flexible key comprises a knuckle assembly which includes a chain of successively hinged knuckles. Some of the knuckles incorporate a first set of key bit projections extending in the direction of the upright first portion of the curved keyway. Some of the knuckles also incorporate a second set of key bit projections which extend in the direction of the cross-wise second portion of the curved keyway.
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 July 29, 1992 and granted August 25, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 29, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 29, 2014.
- 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.