Hot air sealing apparatus
CA 1066179 A · Owner: Thames Sack And Bag Company Limited (The) Trading As Thames Packaging Eq Uipment Company (The) · Inventors: Greisman, Samuel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A hot air heat sealing apparatus for sealing together two layers of heat softenable plastics material comprising a fan ducting arranged to divide the air stream from the fan into at least two flows, a heater disposed in the path of one of said flows, means by which air heated by the heater is directed in use onto the layers of plastics material thereby to soften said layers at a region thereof where they are to be sealed together, a pair of rollers arranged to nip the softened layers together to produce a seal, one of said pairs of rollers being mounted for pivotal movement radially relative to the other roller of said pair, means for pivotally moving said one roller whereby the nipping …
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 November 13, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 13, 1996.
- 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.