Method of extrusion molding and apparatus therefor
CA 2049285 A1 · Owner: Satoh, Atsushi · Inventors: Nakajima, Takashi; Matsugishi, Noriaki; Furusawa, Toshihiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of extrusion molding wherein the fluidity of a molding , material in a die is kept satisfactory and the productivity of molded items having a uniform thickness is greatly improved and an, apparatus therefor capable of carrying out the method with reasonable construction of the apparatus. Molding is carried out while the die provided with an extrusion opening gap adjusting means is resonated. Furthermore, preferably, to make smooth the flow of the molding material in the vicinity of an extrusion opening of the die where the flow is most likely to stagnate in general the , extrusion opening gap adjusting means is attached to a part of the die, which forms an extrusion opening …
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 January 21, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 21, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 21, 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.