Expanded plastics mouldings
CA 1109620 A · Owner: Gebrueder Buehler Ag · Inventors: Egli, Ernst
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Method and apparatus is disclosed for producing expanded plastics articles having an outer skin and a porous core. Plastic melt containing foaming agent is injected into a mold in which gas counter pressure prevails to counter expansion of the melt during the injection. The gas is progressively displaced by the melt. Pockets of trapped gas are relieved of pressure and the gas removed from the mold. The invention improves the production of articles of the above type having a relatively complex shape.
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 29, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 29, 1998.
- 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.