Extruder having degree-of-kneading adjusting device
CA 1306838 C · Owner: Japan Steel Works, Ltd. (The) · Inventors: Shirato, Toru; Yoshida, Minoru; Mizuguchi, Hideki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A resin extruder in which the degree-of-kneading of the resin can be effectively controlled. The invention can be applied to both a single-screw extruder and a twinscrew extruder. In either case, blocking walls are formed around a cylindrical portion of the screw or screws just upstream of the kneading section. A valve structure is provided in the walls to control the kneading of resin at the kneading section.
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 September 1, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 1, 2009.
- 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.