Gearing
CA 2018693 C · Owner: Dollhopf, Rudiger · Inventors: Dollhopf, Rudiger
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A gearing with two axis-parallel output shafts rotating in the same direction, for operation of a double screw extruder, has two pinions of equal size which are arranged in the annular space between an internally toothed ring gear and an intermediate gear in the spacing of the screws of the double screw extruder and mesh with the intermediate gear and with the ring gear. The first of the two pinions is arranged on the driving shaft which is, extended as output shaft. The second pinion is arranged on the second output shaft. The gearing permits torque division of the torque from the driving shaft to the two output shafts.
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 June 11, 1990 and granted November 16, 1993. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 11, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 11, 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.