Apparatus and process for thermoforming plastic materials
CA 1311341 C · Owner: Wendt, Michael L. · Inventors: Wendt, Michael L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus and method for thermoforming articles out of a sheet plastic material utilizes a female mold having one or more cavities and a male mold including corresponding plug assists. Each cavity of the female mold communicates with a first passageway connected to a switched vacuum source. Each plug assist is provided with at least one inlet extending through the plug assist and at least one second passageway each of which, communicate with a respective cavity when the mold is closed. A switched first heated air source communicates with the inlet supplies heated air through the inlet into the cavity under pressure. A second switched heated air source communicates with each second …
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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 December 15, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 15, 2009.
- 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.