Transparent, compact polyurethane casting compositions that are sterilizable with superheated steam, process for preparing same, and their use, particularly for medical-technical particles
CA 2014516 C · Owner: Basf Aktiengesellschaft · Inventors: Gerold, Friedrich; Ramsteiner, Falko; Heckmann, Walter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to transparent, substantially compact polyurethane casting compositions sterilizable with superheated steam, which are prepared by the reaction of:, A) modified diphenylmethane diisocyanates (A) that are liquid at 23°C and are in turn are obtained by the reaction of, 1) a diphenylmethane diisocyanate isomer mixture, which in terms of 100 parts by weight comprises 60 to 90 parts by weight of 4,4'-diphenylmethane diisocyanate, 40 to 8 parts by weight of 2, 4'-diphenylmethane diisocyanate and 0 to 5, parts by weight of 2,2'-diphenylmethane diisocyanate with, 2) at least one polyoxypropylene polyol initiated with glycerine and/or, trimethylol propane having a molecular, …
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 12, 1990 and granted December 30, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 12, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 12, 2012.
- 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.