Automatic bubble blower for orientation film lines
CA 2077941 C · Owner: Cryovac, Inc. · Inventors: Varadi, John Louis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to an automatic bubble blower for tubular orientation film lines. More specifically the invention relates to an apparatus for blowing the isolated bubble for biaxially stretch orienting thermoplastic flexible film comprising a high flow fluid conduit having a proximal end for introducing a high pressure fluid, and a distal end substantially perpendicular to said proximal end and having attached to said distal end, a bullet through which the high flow fluid may pass into the interior of the tubular thermoplastic film tape a cutting, device such as a rotating knife located on said high flow fluid conduit, and an automatic bubble blowing control system means.
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 September 10, 1992 and granted June 20, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 10, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 10, 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.