Device for and method of molding for injection molding machine
CA 2103269 C · Owner: Nogawa, Makoto · Inventors: Nogawa, Makoto; Fujimoto, Satoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a device for and a method of molding for an injection molding machine to enable to reduce variations in weight of resin molded products and obtain stable product quality. Therefore when the upper mold (15) comes at a specified position a, screw (61) of the injection unit (30) is advanced to start injection of molten resin and, when the screw advances to the specified position, the screw speed is decelerated to the specified speed. In addition when, the screw comes at the predetermined stop position the, screw is stopped and simultaneously the injection rate of molten resin is reduced and the molten resin is kept pressurized until the gate (71) is closed.
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 May 31, 1991 and granted June 16, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 31, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 31, 2013.
- 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.