Method and apparatus for cold-forming plastic sheet
CA 1070468 A · Owner: Peerless Machine And Tool Corporation · Inventors: Meadors, William R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of and apparatus for cold-forming a thermoplastic sheet to provide a circular container part such as a lid or dish comprising the steps of engaging a sheet of thermoplastic material between opposing concentric die members, drawing the sheet around the circular edge of one of the die members to provide a concentric central portion and a concentric annular depending skirt having a proximal edge adjacent the central portion an inter-, mediate portion, and a distal free edge providing an annular void in the, die members adjacent the skirt then moving the free edge toward the proximal edge while holding the proximal edge to buckle the said intermediate portion into the void. In the …
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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 January 29, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 29, 1997.
- 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.