Mold for press molding and process for press molding of thermoplastic resin using the same
CA 2086106 C · Owner: Sumitomo Chemical Co. Ltd. · Inventors: Hara, Takahisa; Matubara, Shigeyoshi; Matsumoto, Masahito
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to a method of press molding that is carried out using a mold having an upper half a lower half and a nozzle which opens and closes a molten resin passage provided in the upper half or the lower half and which is located 10-100 mm below a mold cavity side surface of the half. A thermoplastic resin is supplied to a cavity between the upper half and the lower half which is not closed and the mold is clamped. Thus, a molded article having a good appearance can be produced even when the molding cycle is short.
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 April 23, 1992 and granted May 21, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 23, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 23, 2014.
- 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.