Liquid crystal polymer film
CA 2064808 C · Owner: Harvey, Andrew C. · Inventors: Harvey, Andrew C.; Lusignea, Richard W.; Rubin, Leslie S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A flat and nearly mechanically isotropic liquid crystal polymer film (38) can be formed by laminating two biaxially oriented films. A laminate is produced having two thin outer surface portions which are oriented in one direction and a relatively thick inner portion. The film is formed by passing a polymer through a set of three tubular rotors (30) which are concentric and have facing surface which define inner and outer annular polymer flow channels. These rotors may rotate in the same or opposite direction of the flow. Another way to make the film is with a slit-type die (90) through which a polymer flows in one direction, while a moving band (91) passes continuously in a traverse …
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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
- Filed June 18, 1990 and granted August 15, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 18, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 18, 2012.
- 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.