Method for stripping contaminants from wastewater
CA 2114358 C · Owner: Texaco Development Corporation · Inventors: Von Klock, Byron; Zuber, Irl L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method has been discovered for stripping aromatic hydrocarbon contaminants from wastewater and retaining the aromatic hydrocarbons on activated carbon. The wastewater is contacted countercurrently with stripping gas. The stripping gas is passed over a bed of activated carbon to regenerate the stripping gas. The entire volume of stripping gas is recycled to the stripping vessel. There is no purge of stripping gas or aromatic hydrocarbons to the atmosphere. The removed aromatic hydrocarbons are retained by the activated carbon and periodically recovered. An activated carbon particularly adapted for retaining and recovering aromatic hydrocarbons has been found.
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 January 27, 1994 and granted April 4, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 27, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 27, 2016.
- 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.