A papermaking process and a cationic chemical
CA 2265432 A1 · Owner: Hormi, Osmo Eelis Olavi · Inventors: Hormi, Osmo Eelis Olavi; Koskela, Juha Pekka
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a process for the making of paper or a corresponding fiber product, in which process a cationic chemical is added to the paper or the corresponding fiber product in order to render hydrophobic the paper or the corresponding fiber product, the cationic chemical having the formula where R1, R2 and R3 are the same or different and are each a saturated or unsaturated acyclic, cyclic or aromatic hydrocarbon containing 1-41 carbon atoms, R4 is a saturated or un-saturated acyclic, cyclic or aromatic hydrocarbon containing 1-41 carbon atoms and at least one oxygen atom and X- is an, anion. The invention also relates to a cationic chemical which has an ability to attach …
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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 16, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 16, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 16, 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.
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.