Device for continuous hot-sealing of thermoplastic films
CA 1298538 C · Owner: Cappi, Angelo · Inventors: Cappi, Angelo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A device is disclosed for continuous hot-sealing of thermoplastic films. This device comprises a sealing head provided with two rip cord electric resistances that are heated by causing an electric current to flow therethrough. The resistances are made of a material the electric resistance of which is proportional to the temperature. The sealing head is caused to rapidly vibrate against a counter-plate so as to cause the thermoplastic film to be sealed to be rapidly pounded as it glides between the head and the counter plate. The sealing of the thermoplastic film is brought about by the synergistic action of the heat of the resistances and the pressure due to the pounding.
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 April 7, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 7, 2009.
- 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.