Degradable films
CA 2074578 C · Owner: Novacor Chemicals Ltd. · Inventors: Taylor, Joe
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is a need for degradable films, particularity in agricultural mulch applications. The present invention provides for films having a controlled life, from 30 to 160 days. The film comprises photodegradable sheet material having a thickness from 0.1 to 10, preferably from 0.2 to 5, most preferably from , 0.3 to 1.0, mils and comprising a polyolefin sheet and from 50 to 1,000 parts per million of cerium salt of a C16-20 fatty acid and from 1,000 to 20,000 parts per, million of titanium dioxide having a particle size less than 0.05 microns.
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 July 23, 1992 and granted November 11, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 23, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 23, 2014.
- 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.