Modular corrugator
CA 2048633 C · Owner: Frankische Rohrwerke Gebr. Kirchner Gmbh + Co. · Inventors: Weppert, Rainer; Henninger, Gerhard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A corrugator for ribbing pipes comprising two synchronously circulating chains of mold halves, guide means for the mold halves having an input zone in which the associated mold halves are brought into engagement with each other a, molding zone in which a central channel is provided for guiding the engaging mold jaws and an output zone in which the mold halves are again separated from each other as, well as return guides for the mold halves on the path between the output and input zones and cooling means for cooling at least the central channel with a coolant comprises a plurality of hollow profile modules for forming the molding zone, each module being provided with a central cavity for the …
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 August 16, 1990 and granted July 6, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 16, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 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.