Canadian application, no grantCanada
Method of treating fly ash and fly ash cement
CA 2072673 A1 · Owner: Onoda Cement Co. Ltd. · Inventors: Kuroda, Takeshi; Tsukada, Kazuhisa; Mukaino, Takane
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Commercially available fly ash is prepared and charged in a vessel. A halogen gas is supplied to the vessel and is brought into contact with the fly ash in the vessel.
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 June 29, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 29, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 29, 2014.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJune 29, 1992
GrantedNo grant recorded
Term endedJune 29, 2012
Patent numberCA 2072673 A1
Classification (IPC)C04B7/26 +1 more
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.