Transparent, autoclavable, non-cytotoxic, essentially compact polyurethane embedding compositions, the preparation thereof and the use thereof, especially for articles used in medicine
CA 2082019 C · Owner: Knorr, Gottfried · Inventors: Ramsteiner, Falko; Hinz, Werner; Knoblauch, Georg
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, autoclavable non-cytotoxic, essentially, compact polyurethane embedding compositions which are prepared by reacting, a) modified diphenylmethane diisocyanates with b) compounds with at least two reactive hydrogens which contain or are composed of, b1) at least one polyether-polyol with an average functionality of from 3 to 8, a hydroxyl number of from 200 to 1000 and an alkali metal ion content of from 150 to 1200 ppm or, preferably, a mixture of (b1) and castor oil and/or at least one polyetherpolyol (b2) with a functionality of from 2 to 3 a, hydroxyl number of from 90 to 200 and an alkali metal ion content of less than 10 ppm, in the presence or …
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 3, 1992 and granted June 3, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 3, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 3, 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.