Calender for material webs of paper or the like
CA 2113665 C · Owner: Sulzer Papertec Krefeld Gmbh · Inventors: Conrad, Hans-Rolf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A calender for material webs of paper or the like comprises at least one pressing gap (3) and at least one heatable or coolable tempering roller (4). A charging device (12) electrostatically charges the material web (1) moving towards the tempering roller (4). As a result heat, transfer between tempering roller and material web is improved.
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 January 18, 1994 and granted November 18, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 18, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 18, 2016.
- 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.