Apparatus for feeding a preferably multiply web of synthetic thermoplastics
CA 2021216 A1 · Owner: Windmoller & Holscher · Inventors: Kohn, Uwe; Kissel, Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus for feeding a preferably multiply web of synthetic thermoplastics comprises a pair of feed rollers, which define a feeding nip and are formed with annular grooves, two stripping rakes which are secured to a main frame and have tines which extend on both sides of the web in the annular grooves and diverge on the receiving side of the rollers and rows of air-blasting nozzles, which extend in the direction of travel of the web and are disposed on both sides of the web on the delivery side of the rollers. In order to ensure that the air blast which tends to tension and advance the web will not subject the tines to vibration, which might damage the stripping rake the tines are …
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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 July 16, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 16, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 16, 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.