Safety gear
CA 2218794 C · Owner: Lempio, Ilkka · Inventors: Aulanko, Esko; Tyllinen, Juha; Lempio, Ilkka
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A safety gear (1) comprising a frame, provided with a braking surface which, when the safety gear is, braking is pressed against a first, guide surface of a guide rail. Mounted in the frame is a roller (3), which moves along a track in, the safety gear. The track comprises at least a first gradient and a, second gradient the first gradient, having a larger pitch angle than the second gradient. The roller is, pressed against a second guide surface of the guide rail when the, safety gear is braking. The roller (3) has a stronger grip on the track, on the first gradient than on the second gradient.
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 November 6, 1997 and granted September 10, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 6, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 6, 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.