Internal bubble cooling control system and method
CA 2433010 C · Owner: Cree, Robert E. · Inventors: Cree, Robert E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An internal bubble cooling air control system in a blown film apparatus has sensors (48a, 48b, 52a, 52b) arranged to increase response time and reduce interference, and includes a high speed valve (46) for fast actuation of air flow from a controller (44) in response to signals received from the sensors (48a, 48b, 52a, 52b).
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 December 21, 2001 and granted August 13, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 21, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 21, 2023.
- 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.