Rekeyable cylinder and its keys
CA 2134533 C · Owner: Lo, Jiuan Peng · Inventors: Lo, Jiuan Peng
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A rekeyable cylinder and its keys include a core and a plug. A plurality of pin cell is formed respectively in the core and plug and is perpendicular to the axis of keyway in the plug. Each pair of pin cells have a spring, an upper pin and a lower pin disposed therein. In locking status, upper pin is moved into pin cell of plug, and lower pin is moved into keyway, thereby plug cannot rotate or move in axial direction. A first control pin is disposed at one end of the core and engages with an annular groove formed around the circumference of the plug, thus allowing the plug to rotate but cannot make linear movement. A control key can release the first control pin from the annular groove thus …
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 October 27, 1994 and granted August 17, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 27, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 27, 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.