Wastewater treatment
CA 1099831 A · Owner: Sterling Drug Inc. · Inventors: Burant, Walter, Jr.; Knopp, Paul V.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for treating wastewater comprising the following steps:, a. contacting wastewater in a stream in a biological contactor apparatus which, has a multiplicity of surfaces therein alternately immersed in the liquid and the gas above the liquid, for a period of time of at least 1/2 hour;, b. adding to the stream an adsorbent capable of adsorbing impurities from, the liquid; and c. removing accumulated suspended solids from the contactor apparatus at a rate equivalent to the rate at which solids accumulate within the contactor.
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
- Granted April 21, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 21, 1998.
- 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.