Detucker for vertical form and fill machine
CA 2008191 C · Owner: Wirsig, Ralph Carl · Inventors: Wirsig, Ralph Carl; Perrett, Arnold Edward
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process and apparatus are disclosed for minimizing the formation of tucks in horizontal seals of pouches made an a vertical form fill, and seal machine. One embodiment includes a constraint chute below said the heat sealing jaws of the machine. The constraint chute comprises two vertical walls which axe adapted to permit a material-filled pouch to travel therebetween, the pouch being formed by transversely heat sealing a material-filled tubular film at intervals, using the jaws to form the seals, one of the walls being adapted to move away from the other wall under tension and to return to its original position the, degree of tension and the friction of the walls being sufficient to squeeze …
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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
- Filed January 19, 1990 and granted March 14, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 19, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 19, 2012.
- 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.