Process and device for producing bubble-film
CA 2062827 C · Owner: Konermann, Stefan · Inventors: Konermann, Stefan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a process for the fine correction of the thickness profile of a blown portion (10) in the production of bubble film in which the flow, of cooling air (6) is varied in individual peripheral regions of the film bubble. According to the invention, at least part of the cooling air is taken via an exit slot, (20) which is divided into individual separately fed segments in the peripheral, direction of the film bubble and the supply of additional cooling air (4) via the exit, slot (20) is, for example, controlled per segment using radial blowers (7). In this, manner it is possible accurately to regulate the cooling action and thus the film, thickness in the …
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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 19, 1990 and granted September 12, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 19, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 19, 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.