Expired Canadian patentCanada
Polypropylene-polyethylene-(ethylene-propylene rubber) compositions and films thereof with improved tear strength
CA 1279421 C · Owner: Lu, Pang-Chia · Inventors: Lu, Pang-Chia
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The tear strength of biaxially oriented polypropylene is improved by adding linear low density polyethylene, e.g. about 5-40 weight percent and an, ethylene propylene rubber, e.g. about 1-10 weight percent.
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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 22, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 22, 2008.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledDecember 12, 1985
GrantedJanuary 22, 1991
Term endedJanuary 22, 2008
Patent numberCA 1279421 C
Classification (IPC)C08L23/12 +1 more
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.