Process and apparatus for remedying polluted media
CA 2237767 C · Owner: Kawaguchi, Masahiro · Inventors: Sugawa, Etsuko; Toge, Yoshiyuki; Imamura, Takeshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process to remedy a polluted medium includes contacting a first medium containing a pollutant with a second medium containing a microorganism which is capable of decomposing the pollutant. A membrane permeable to the pollutant and impermeable to the microorganism is spaced between the first and second media. The first medium and the second medium may flow in opposite directions to each other.
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 14, 1998 and granted September 17, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 14, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 14, 2020.
- 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.