Method for forming a burstable pouch
CA 1206406 A · Owner: Johnson (S. C.) & Son, Inc. · Inventors: Malek, Edward J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved method for forming closed burstable pouches (10) having breakable seals. The method includes selection of a laminated polymeric film (16) which has two principal layers -- an outer layer (20) which is responsive, and an inner layer (18) which is non-responsive to a radio-frequency (RF) welding field the outer layer, (20) having greater cohesive strength than the remainder of the film and a higher melting point that the inner layer (18). With two sheets of such material oriented with their inner surfaces in contact, the breakable seal (14) is formed by applying an RF welding field for a time and at an intensity to heat the outer layers (20) sufficiently to fuse the inner layers …
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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 June 24, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 24, 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.