Expired Canadian patentCanada
Improved creping adhesive modifier and process for producing paper products
CA 2425235 C · Owner: Kokko, Bruce J. · Inventors: Luu, Phuong V.; Worry, Gary L.; Wendt, Greg A.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to the use of a quaternary ammonium complex comprising at least one non-cyclic amide as a modifier for a creping adhesive used on a creping cylinder e.g. a Yankee dryer.
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 April 11, 2003 and granted February 22, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 11, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 11, 2025.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledApril 11, 2003
GrantedFebruary 22, 2011
Term endedApril 11, 2023
Patent numberCA 2425235 C
Classification (IPC)C09J133/24 +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.