Adsorbent and cleaning method of waste gas containing ketonic organic solvents
CA 2054254 C · Owner: Tosoh Corporation · Inventors: Inoue, Takahiko; Harada, Masashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An adsorbent comprising zeolite with an amount of solid acid of not more than 0.05 mmol/g as determined by pyridine temperature programed desorption method and with a SiO2/Al2O3 molar ratio of not less than 50, and a method of cleaning waste gas containing ketonic organic solvents are disclosed.
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 25, 1991 and granted June 12, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 25, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 25, 2013.
- 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.