Vacuum cleaner train for cleaning tracks, particularly for underground railway networks
CA 2084696 C · Owner: Neu Transf'Air · Inventors: Renaudin, Yves
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a vacuum cleaner train which comprises a blowing device mounted transversely and two suction devices disposed downstream and upstream of the blowing device, as well as means for transversely adapting the blowing and suction flows, adapted to effect a non-homogeneous distribution of said flows transversely with respect to the direction of the train. According to one version the suction and blowing, devices comprise pipes partitioned into three compartments, three supple conduits for connection to the corresponding fans and means for positioning the conduits on one or the other compartment. According to another version these devices com-, prise nozzles …
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 December 7, 1992 and granted April 29, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 7, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 7, 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.