Use of fluorinated polyurethanes for the treatment of films or sheets made of cellulose, graphite, mica, kaolin, leather and similar natural materials
CA 2074872 C · Owner: Simeone, Giovanni · Inventors: Tonelli, Claudio; Simeone, Giovanni
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A class of cross-linked fluorinated polyurethanes which, can be used for protecting and reinforcing coatings on films sheets, laminates and similar thin structures made of cellulose, graphite, mica, kaolin, leather etc. as well as for adhesive and reinforcing material in multy-layer structures made of films, sheets, laminates and similar thin structures made of graphite, mica, kaolin, etc. These polyurethanes can be obtained starting from the following components: (A) a polyisocyanate consisting of a perfluoropolyether chain bound to the -NCO terminal groups through an aromatic or cycloaliphatic radical; and, (B) a polyol consisting of a perfluoropolyether chain bound to the -OH terminal …
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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 July 29, 1992 and granted February 5, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 29, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 29, 2014.
- 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.