Liquid drainage system for a hard-top surface
CA 2255729 A1 · Owner: N.V. Luchthaven Schiphol · Inventors: Geerdink, Johannes Antonius Bernardes
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A liquid drainage system for a hard-top surface (1) such as at an airport, harbour area and the like comprises a gutter (3), which is provided in the said surface (1) and is connected to a sink hole (6 7), from which the liquid , can be drained via a sewer (8). A ball valve (16) is provided in the sink hole (6, 7), which ball valve comprises a valve as well as a ball body which floats in water and sinks in a lighter liquid such as kerosine, so that the valve , interacts in a sealing manner with an associated valve seat which ball valve , is located between the gutter (3) and the sewer (8).
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 May 20, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 20, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 20, 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.