Reiforced polymer compositions having excellent distinctness of image
CA 2000807 C · Owner: The Dow Chemical Company · Inventors: Martinez, Eloy C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Molded polyurethanes are filled with a mica filler being delaminated such that the filled polymer composition retains a notched Izod impact strength of at least about 2.5 ft-lb./in notch (135 J/m notch) and a distinctness of image on a painted surface and at least about 85. The mica filler preferably has a thickness of less than about 1.5 µm. Use of such a mica filler provides a polymer composition having surprising good physical properties and excellent surface quality.
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 October 16, 1989 and granted March 7, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 16, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 16, 2011.
- 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.