Stepping screen assembly for collecting solids in waste water discharges
CA 2324680 A1 · Owner: Wiesemann, Bruce O. · Inventors: Wiesemann, Bruce O.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A stepping screen assembly bottom portion is located in a liquid waste stream containing solids. The assembly contains a grid structure surrounded by an outer frame. The, grid structure includes multiple parallel alternate static and dynamic bars horizontally spaced, apart by spacers attached to the sides of the dynamic bars. Each bar has multiple vertically, spaced apart shelves at a right angle to the vertical axis of the bar. The outer frame on each, side of the grid structure contains a single and double stroke pneumatic cylinder connected to, the dynamic bars. The single stroke cylinder causes the dynamic bars to move in a vertical, plane and the double stroke pneumatic cylinder …
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 October 30, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 30, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 30, 2022.
- 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.