Machine with at least two working shafts, particularly a double-screw extruder machine, which are able to operate with high force
CA 2003370 C · Owner: Bonalumi, Luigi · Inventors: Bonalumi, Luigi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A machine with at least two working shafts particularly a, double-screw extruder machine comprises associated with, each shaft a gear rotated by a drive gear coaxial to the, shaft and gear by way of at least two idle gear wheels acting on the gear and disposed within the drive gear. Each idle gear wheel rotates about a shaft supported by a support member which is advantageously mobile in a plane orthogonal to the axis of the shaft and is disposed about the latter; between the drive gear and idle gear wheels there is provided a floating gear to transmit the drive force of the drive gear to the idle gear wheels.
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 November 20, 1989 and granted September 21, 1993. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 20, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 20, 2011.
- 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.