Drain filtering device
CA 2254937 C · Owner: Silva, Charles · Inventors: Silva, Charles
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A drain filtering device (44) is disclosed. The improvement over the prior art is comprised of reducing the filter size from an elongated device that spans the length of the gutter system (46) to a modular unit which is neccessary only at the drain site. The invention also includes an inclined upper face (54) which is positioned on the upstream side of the drain in the gutter and a down spout attachment which locates the invention in the gutter such that the flow of filtered water passes through the invention and into the downspout. The debris (58) that collects in the gutter is carried along with the water until it makes contact with the inclined upper face (54) and is forced up …
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 21, 1996 and granted July 15, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 21, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 21, 2018.
- 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.