Apparatus and method for radio frequency sealing thermoplastic films together
CA 2084843 A1 · Owner: Lovin, Joseph R. · Inventors: Lovin, Joseph R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Films of thermoplastic material may be sealed together by application of a radio frequency field through a pair of oppositely positioned electrodes. Preferred thermoplastic materials have a low dielectric dissipation factor and such, materials include polyethylene. The sealing apparatus includes a circuit having compensation and matching circuits for providing resonant operation and minimizing the amount of reflected energy from the electrodes. Through the use of this invention effective RF sealing is produced between films of thermoplastic material having a low dielectric dissipation factor. Further the sealing apparatus preferably includes at least one electrode coated with a ceramic and …
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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 December 8, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 8, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 8, 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.