Antistatic polyurethane-urea dispersions
CA 2002576 A1 · Owner: Ruetman, Sven H. · Inventors: Ruetman, Sven H.; Collins, G. Robert; Anand, Joginder N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a dispersion of a polyurethaneurea polymer in a continuous phase. This dispersion contains 0.1 to 5 parts by weight of an ionizable non-, volatile salt per 100 parts by weight of polyurethaneurea polymer. The dispersion of this invention is useful in preparing static dissipative coatings films, membranes and the like.
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 November 9, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 9, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 9, 2011.
- 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.