Canadian application, no grantCanada
Method for inhibiting the deposition of white pitch in paper production
CA 2325433 A1 · Owner: Croft, Alan P. · Inventors: Croft, Alan P.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Ethyleneamine compound(s), or mixtures thereof are used in effective amounts , to reduce or inhibit the deposition of white pitch on the paper making equipment during the processing to recycle coated paper.
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 March 2, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 2, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 2, 2021.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 2, 1999
GrantedNo grant recorded
Term endedMarch 2, 2019
Patent numberCA 2325433 A1
Classification (IPC)D21C5/02 +2 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.