Modified polyurethanes with increased light stability
CA 1094242 A · Owner: Ciba Specialty Chemicals Holding Inc. · Inventors: Muller, Helmut; Rody, Jean; Hofmann, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Case 3-10466/S/1+2, Canada, MODIFIED POLYURETHANES WITH INCREASED LIGHT STABILITY Abstract of The Disclosure, The incorporation of sterically hindered piperidine derivatives into polyurethanes protects this polymer material against light degradation. Usable for the incorporation are piperidine derivatives which are at least difunctional towards isocyanates and contain the structure wherein R is hydrogen or alkyl having 1 to 5 carbon atoms.
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
- Granted January 20, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 20, 1998.
- 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.