Thermoplastic blend of polypropylene, epm and propylene-ethylene copolymer
CA 1138147 A · Owner: Exxon Research And Engineering Company · Inventors: Smith, William S. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Thermoplastic polymer blends of improved impact strength and knit line toughness consisting essentially of (a) 60-90% by weight polypropylene, (b) 30-5% by weight of thermoplastic crystalline heteroblock propylene-ethylene copolymer and (c) 30-5% by weight of an ethylene-propylene copolymer rubber.
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 December 21, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 21, 1999.
- 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.