Abrasive wiping articles and a process for preparing such articles
CA 2129244 C · Owner: Mackey, Larry Neil · Inventors: Wong, Arthur; Franxman, James Joseph; Burchnall, John Billings
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed are abrasive wiping articles e.g. nonwoven, preferably paper towels which comprise an absorbant nonwoven, substrate having printed thereon a cured scrubbing bead mixture which comprises a) certain carboxylated ionically-charged, polymeric abrasive particles b) a carboxyl group-containing polymeric adhesive material and c) an amino-epichlorohydrin, e.g. Kymene ~ cross-linking agent. The polymeric abrasive particles range in size from about 20 to 400 microns and have a knoop hardness of from about 4 to 25. The polymeric adhesive material upon curing, has a Knoop hardness of from about 0.5 to 17. Preferred wiping articles of the foregoing type have a pattern of the scrubbing bead …
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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 January 27, 1993 and granted December 23, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 27, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 27, 2015.
- 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
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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.