Plastics bag
CA 1086270 A · Owner: Imperial Chemical Industries Limited · Inventors: Lawes, Norman E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A plastics-film bag having one wall formed by overlapping panels joined by a longitudinal seal, and having a filling valve constituted by a passageway left between the panels in which at least one additional layer of film or other flexible material is included between the panels in the overlap, to improve the security of the valve.
Read the whole patent
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 September 23, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 23, 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.