Multi-layer polypropylene film structure
CA 1263210 C · Owner: Park, Hee C. · Inventors: Park, Hee C.; Nahmias, Alan M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An oriented multi-layer polypropylene film structure comprises a base layer comprising polypropylene of relatively high stereoregularity and a skin layer comprising a polyolefin of relatively low stereoregularity coextruded on at least one surface of the base layer. The skin layer contains a combination of finely divided silica, a silicone oil and a polymer which is incompatible with said skin layer polyolefin and which has a melting point exceeding that of the skin layer polyolefin by at least 83°C (150°C).
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 November 28, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 28, 2006.
- 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.