Lift installation with drive unit arranged in the lift shaft
CA 2220582 A1 · Owner: Ammon, Urs · Inventors: Ammon, Urs
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In this lift installation, lift cage (2) and counterweight (3) are driven by a drive unit (4) which is arranged in a lift shaft (1), by means of cables (5). A carrier yoke (9) is arranged at the upper ends of a first guide element (6) and a second guide element (7). The cables (5) end on the one hand at a first fixed point (10) of the carrier yoke (9) and on the other hand at a second fixed point (11) of a third guide element (8). The cables (5) run from the first fixed point (10) by way of a first roller (12) arranged at the counterweight (3) then by way of a second roller (13) arranged at the carrier yoke (9) then by way of a, drive pulley (4.1) of the drive unit (4) then by way of a …
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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 November 10, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 10, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 10, 2019.
- 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.