Shear processing thermoplastics in the presence of ultrasonic vibration
CA 1319485 C · Owner: Cranston, Cameron · Inventors: Cranston, Cameron; Lee, Biing-Lin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Various processing advantages are gained when ultrasonic vibration is applied to a thermoplastic processing apparatus such as an extruder or an injection molding device. Such advantages include improved flow rate, reduced processing pressure, and consequently reduced processing temperature to mold or extrude the melted thermoplastic. The ultrasonic vibration is desirably applied to the die of the processing apparatus and in a direction longitudinal to the flow of the thermoplastic. Suitable thermoplastics include polystyrene and polyolefins.
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 June 29, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 29, 2010.
- 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.