Traction sheave elevator
CA 2126492 C · Owner: Hakala, Harri · Inventors: Mustalahti, Jorma; Hakala, Harri; Aulanko, Esko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A traction sheave elevator comprises an elevator car moving along elevator guide rails, a counterweight moving along counterweight guide rails a set of hoisting, ropes on which the elevator car and the counterweight are suspended, and a drive machine. The drive machine comprises a traction sheave driven by the drive machine and engaging the hoisting ropes. The drive machine of the elevator is placed in the upper portion of the elevator shaft in the space between the shaft space required by the path of the elevator car and/or an overhead extension therefor and a wall of the elevator shaft.
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 June 22, 1994 and granted March 16, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 22, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 22, 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.