Lock system
CA 2050312 C · Owner: Keller, Ernst · Inventors: Keller, Ernst
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A lock system has lock cylinders (5) in which the rotor (9) is lodged as usual in the cylinder housing, (11) as well as lock cylinders (6) in which the rotor (10) is rotated through 180° about its longitudinal axis relative to the other rotors (9). The security keys for the lock system are flat keys and not turning keys and, in the event that these are priority keys, have two completely independent key codes. The invention also provides a further possibility for increasing the number of variations of the lock and thus for increasing its security.
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 January 11, 1991 and granted December 1, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 11, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 11, 2013.
- 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.