Olefin polymer barrier films and methods for use thereof
CA 1233595 A · Owner: The Dow Chemical Company · Inventors: Wong, Nang C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved method for confining chemical treatment agents to areas of application and adjacent areas desired to be treated employing films made from olefin polymers. The olefin polymer film contains derivatives of fatty acid which reduces the permeability of the film as evidenced by reduction in the diffusion rates of the chemical treatment agents through the film. The films are suitably employed as soil fumigation tarpaulins or soil covering materials. -32-
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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 March 1, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 1, 2005.
- 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.