Hydraulic elevator with concentrated car suspension means
CA 2018532 C · Owner: Pelto-Huikko, Raimo · Inventors: Pelto-Huikko, Raimo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A hydraulic elevator system includes an elevator car vertically movable in an elevator shaft, and a hydraulic actuator means for lifting the elevator car. The hydraulic actuator means is disposed within the elevator shaft proximal a lateral side of the elevator car. A car suspension means links the elevator car and the hydraulic actuator for movably suspending the elevator car within the elevator shaft. The car suspension means extends laterally across the elevator shaft above the elevator car. A compensating means in the form of any one of a balance lever a common pulley or a hydraulic cylinder is provided in the elevator shaft proximal the hydraulic actuator means, for compensating an …
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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 7, 1990 and granted October 21, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 7, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 7, 2012.
- 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.