Soft thermoplastic polyurethane ureas, a process for their preparation and their use
CA 2133239 A1 · Owner: Wussow, Hans-Georg · Inventors: Muller, Hanns-Peter; Kirchmeyer, Stephan; Rehbold, Bodo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A thermoplastic polyurethane urea prepared by reacting a reaction mixture of, a) one or more polyisocyanates with, b) one or more compounds having on average at least 1.8 Zerewitinoff-active hydrogen atoms and a molecular weight of between 400 and 10,000, and, c) water, wherein the water is introduced into the reaction mixture with the aid of an effective quantity of one or more emulsifiers. The reaction mixture may additionally contain d) further conventional auxiliary substances and additives.
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 September 29, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 29, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 29, 2016.
- 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.