Plastics material film sheet having a preselected weakened area
CA 1181914 A · Owner: Pike, Brian R. · Inventors: Pike, Brian R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A plastics material film which is formed of two films of the same thermoplastics material which are self heat bonded together a first of the films being relatively thick and having resist material thereon in predetermined patterns, and the other of the films being thin as compared to the one film with the other of the films being bonded to the one film at all areas except for the resist area so as to provide a thermoplastics material film sheet or a predetermined thickness which in selected areas only there are two separate films with these areas defining seal forming areas. The film sheet with the seal forming areas may be readily folded and bonded to define pouches or packages having …
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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 February 5, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 5, 2002.
- 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.