Pneumatic elevator using suction and atmospheric pressure as force generators
CA 2085309 C · Owner: Sors, Carlos Alberto · Inventors: Sors, Carlos Alberto
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A novel pneumatic vacuum lift elevator is provided herein. Such pneumatic vacuum lift elevator includes a vertical tube of straight axis and having a smooth interior. A movable transport cab is mounted coaxially in the tube for the transporting of passengers, etc. A plurality of access doors is provided each door having an hermetic, closure at different levels of concordance with the respective floors. An air suction device is arranged in the upper end of the vertical tube the air suction device being, capable of causing a depression zone above the roof of the cab and an atmospheric air, intake is arranged at the lower area of the tube. A sliding and sealing trimming is arranged at the …
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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 December 14, 1992 and granted January 19, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 14, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 14, 2014.
- 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.