Film with angled capillaries
CA 2225030 C · Owner: Tredegar Corporation · Inventors: Francis, Michael A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention is directed to a thermoplastic film (54) having a first surface (59) and a second surface (64). The second surface (64) is spaced apart from the first surface (59). A plurality of perforations (52) extend through the film (54) from the first surface to the second surface (64). The perforations (52) form capillaries (55) that extend from the second surface (64). The capillaries (55) are disposed at an angle from about 5~ to about 60~ with repect to a plane that is perpendicular to the first surface (59).
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 24, 1995 and granted April 4, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 24, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 24, 2017.
- 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.