Isocyante-terminated prepolymers derived from polyether polyol mixtures having low monol content and their use in polyurethanes
CA 2095876 A1 · Owner: Arco Chemical Technology, L.P. · Inventors: Barksby, Nigel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Isocyanate-terminated prepolymers derived from polyether polyol mixtures having low monol contents are disclosed. The prepolymers are moisture cured or chain extended to give polyurethanes with improved tensile strength tear strength, and, reduced stress at high elongation. The polyether polyol mixtures have monol contents less than about 15 mole percent and average, hydroxyl functionalities within the range of about 1.9 to about 2.4.
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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 May 10, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 10, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 10, 2015.
- 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.