Underdrain strainer assembly
CA 2016404 C · Owner: Graver Company (The) · Inventors: Soriente, Alfonse J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A strainer assembly for use in a filter having a granular media bed supported above a floor. The strainer assembly includes a low profile body member having a two tiered construction, the bottom tier having a larger diameter than the upper tier. Each of the tiers has a series of substantially equally spaced apart, generally vertical, slot openings formed therein. The total area of the openings in the bottom tier is from about 3 to 15 times greater than the total area of the openings in the upper tier. An improved distribution/fastening means is provided for directing fluid through the body member and for retaining the body member in position above the floor.
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 9, 1990 and granted November 7, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 9, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 9, 2012.
- 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.