Buoyant ceiling wiper for stacked tank clarifier
CA 2095682 A1 · Owner: Thomas, John · Inventors: Casper, Thomas J.; Thomas, John; Rasper, Susan M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed herein is a wastewater treatment facility including a stacked tank clarifier having a lower tank and an, upper tank above the lower tank the upper tank having a bottom, defining a ceiling of the lower tank and the lower tank further, having a floor. The wastewater treatment facility includes a mechanism for scraping the ceiling of the lower tank. The mechanism includes a driven endless chain loop in the lower tank and a buoyant member carried by the chain loop.
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 6, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 6, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 6, 2015.
- 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.