Longitudinal welding apparatus in a packaging machine
CA 2068855 C · Owner: Sitma S.P.A. · Inventors: Tassi, Lamberto; Ballestrazzi, Aris
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A longitudinal welding apparatus in a packaging machine for products fed on a conveyor belt, comprising a rocking circular welder which overlies the superposed longitudinal edges of a continuous plastics film in which the products are wrapped the rocking, circular welder consisting of at least two independently powered separate semicircular welding elements the welder being rotatable, to position one of its welding elements on the superposed edges of the film, sensors being provided to measure the speed of advancement of the film and to control via an electronic control, device, both the rotation of the welder and the variation in the feed voltage of at least one of the welding elements.
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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 May 15, 1992 and granted December 11, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 15, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 15, 2014.
- 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.