Method and apparatus for fabricating thermoplastic tubes
CA 1071514 A · Owner: Owens-Illinois · Inventors: Doherty, Thomas E.; Amberg, Stephen W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The method and apparatus for forming a sheet of thermoplastic material into a cylindrical sleeve by wrapping the sheet around a cylindrical mandrel with the end portions of the sleeve overlapping, directing a stream of hot air from a duct onto the facing surfaces of the overlapping end portions such that the uppermost end portion is lifted and the hot air softens the facing end surfaces of the thermoplastic sheet upon the end, surfaces becoming softened diverting the hot air away from the end portions, and pressing together the softened end portions with a sealing bar extending longitudinal of the mandrel over the overlapping softened portion.
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 February 12, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 12, 1997.
- 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.