Sheet of polyvinyl butyral and polyurethane
CA 2025508 C · Owner: Monsanto Company · Inventors: David, Donald J.; Sincock, Thomas F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A sheet formed of a polyblend comprising on, a weight basis, a) 30 to 90% polyvinyl butyral containing about 11 to 30 % hydroxyl groups and b) 70 to 10% thermoplastic polyurethane which is the reaction product of:, i) polyether polyol or a mixture of polyether polyol and polyester polyol; and ii) aliphatic diisocyanate, aromatic, diisocyanate or a mixture of aliphatic and aromatic diisocyanates;, the combined percentages of a) plus b) in the polyblend always equaling 100%; such sheet at 0.76mm thickness having no greater than 2% haze.
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 September 17, 1990 and granted November 18, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 17, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 17, 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.