Method of recovering fibres
CA 1114562 A · Owner: The Wiggins Teape Group Limited · Inventors: Sinclair, Peter; Hasler, David J.; Burns, Eileen H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Fibre recovery process for pressure-sensitive carbonless copying paper which comprises defibrating the wastage in aqueous media, preferably in the presence of a cationic quaternary ammonium surface active agent treating the wastage with acid to destroy the microcapsules and bleaching the defibrated wastage with a bleaching agent.
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
- Granted December 22, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 22, 1998.
- 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.