Tube-forming apparatus
CA 2087403 C · Owner: Vernon, Geoffrey William · Inventors: Goodwin, James; Vernon, Geoffrey William
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A flexible heat-sealable web is shaped continuously into a tubular cross-sectional shape eg. as, an intermediate stage in the production of infusion bags comprising severed and sealed lengths of the tubular shape. The web is drawn along a shaped shoe and side margins of the web are folded over opposite sides of the shoe by rollers and fingers to place the opposite side edges of the web in overlapping relationship against the shoe. The overlapped edges pass between a roller mounted in the shoe and an external heated roller to be pressed between the two rollers in order to lap weld the edges together as the web travels along the shoe. The shoe continues to form the web downstream of the …
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
- Filed January 15, 1993 and granted August 29, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 15, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 15, 2015.
- 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.