Paperboard package
CA 1210712 A · Owner: Westvaco Corporation · Inventors: Kemppainen, Roy W.; Humphries, Roscoe R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, A plastic coated paperboard covering is fusibly sealed to a flanged, plastic coated paperboard tray with an intermediate release coating between the cooperative plastic, coat seal surfaces for subsequent separation by peeling the covering away from the flanged tray. - 8 -
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 2, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 2, 2003.
- 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.