Screw extruder for processing rubber or plastics material
CA 1092315 A · Owner: Hermann Berstorff Maschinenbau G.M.B.H. · Inventors: Spielhoff, Horst
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Horst Spielhoff, TITLE OF THE INVENTION "Screw extruder for processing rubber or plastics material" ABSTRACT OF THE DISCLOSURE, A screw extruder for processing rubber of plastics material comprising, a cylinder jacket with a feed hopper a central geared shaft and geared, planet shafts disposed between the central shaft and the cylinder jacket and drivably engaged with the central shaft and the cylinder jacket wherein parts of at least some of the planet shafts are bare of gearing. Advantageously each alternate planet shaft is only partly geared the gearing extending for only approximately half the length of the shaft at one end or the other end or in two quarter length portions at 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
- Granted December 30, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 30, 1997.
- 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.