Method for producing hollow molded article
CA 2060847 A1 · Owner: Hara, Takahisa · Inventors: Matsumoto, Masahito; Nakatsuka, Hiromasa; Hara, Takahisa
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A hollow molded article is produced by supplying a molten resin between a pair of a mixed mold and a movable mold before the mixed mold and the movable mold are closed inserting at least one gas-supplying pin which is provided on a surface of the mixed mold to form a hollow part in a part of the resin and supplying pressurized gas through said gas-supplying pin before or at the same time at the mold closing is finished, closing the movable mold to fill the resin in a cavity formed by the mods, slightly opening the molds while pressurizing a gas in the resin to expand the hollow part and opening the movable mold to remove a hollow molded article from the molds.
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 February 7, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 7, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 7, 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.