Method and apparatus for processing synthetic plastics film
CA 1104783 A · Owner: Hutt, Thomas G. · Inventors: Hutt, Thomas G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A web of synthetic plastics film having a series, of panels separated by longitudinally spaced transverse zones of weakness extending across the width of the web. The zones of weakness are constituted by a series of heat-produced perforations along the lengths of the zones. Adjacent perforations are separated by unperforated portions of the web. When the web is a double layer then the panels are in the form of bags the layers being sealed at the sides of the bags at the perforations in the zones of weakness. A machine for making the web causes a web of, synthetic plastics material to pass longitudinally past a transverse hot cutting and welding edge which cyclicly intersects the web at …
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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 July 14, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 14, 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.