Vacuum forming process for deep drawn plastic articles
CA 1281875 C · Owner: General Electric Company · Inventors: Taylor, Benson Tucker, Jr.; Werkmeister, Robert Lee
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved vacuum forming process for forming a deep drawn plastic article wherein a mold having a hollow cavity and a relatively thick outer shell mounted on a base forms the shape of the article. The shell has a plurality of small passageways through the outer surface connected to relatively large passageways within the outer shell and the passageways are connected to a vacuum pump. A sheet of hot plastic material is placed over the mold and a vacuum is drawn to form the plastic sheet into the shape of the mold to form the article. The improved process provides for a first large passageway interconnected to a plurality of small passageways through the outer surface of the mold outer …
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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 March 26, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 26, 2008.
- 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.