Cylindrical lock assembly
CA 2053167 C · Owner: Robida, James E. · Inventors: Robida, James E.; Strickland, Kenneth W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cylindrical lock assembly includes an inside subassembly and an outside subassembly which are assembled with a door. Each subassembly includes a rose liner a, return spring cassette, a rose, a lever and a lever insert. The inside subassembly also includes a turn button and the outside subassembly includes a cylinder lock. The subassemblies are assembled onto respective sleeves of a chassis which facilitates the retraction of a latchbolt upon operation of either of the levers. Cassettes are mounted in the lock assembly by a pair of screws with one screw being inserted from one side of the door and the other screw being inserted from the other side of the door.
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 10, 1991 and granted April 20, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 10, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 10, 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.