Process for preparing crystalline molding resins
CA 2107959 C · Owner: Bayer Polymers Llc · Inventors: Mason, James P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for increasing the crystalline content of an amorphous or a semi-amorphous crystallizable thermoplastic resins is disclosed. The process entails heating the resin by Infra-red heating. The thus modified resin is then more suitable for drying at a high temperature. The dried resin in, pellets form, is characterized by its flowability and the article molded has better properties than does a corresponding article made from an unmodified resins.
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 7, 1993 and granted December 10, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 7, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 7, 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.