Transversely stretching plastics material
CA 1115016 A · Owner: Mercer Patents Limited · Inventors: Mercer, Frank B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides an apparatus for transversely stretching and molecularly orientating a continuously advancing flexible web, comprising an arrangement for preventing substantial inward movement of the web margins and a pair of opposed hanks of transversely spaced pressure elements between which banks the web can travel whilst its margins are engaged by the restraining means. The pressure elements of one bank are transversely staggered in relation to the elements of the other bank, and, as seen looking in the transverse direction, overlap the pressure elements of the other bank with such a degree of overlap that the pressure elements cause the web to take up an extended form from …
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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 29, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 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.