Reactive hot wire control apparatus and method
CA 2437682 A1 · Owner: Hayward, Kevin M. · Inventors: Hayward, Kevin M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Control system and apparatus for controlling current input to an electrical resistance, element such as a seal wire. The system and apparatus of the present invention is a closed loop, feedback modification to conventional systems and takes advantage of the , inherent expansion of the seal wire as it is heated. When the seal wire expands to a predetermined length, a switch is, triggered which interrupts at least a portion of the power supplied to the wire for heating. The, interruption continues until the wire contracts to a length less than the predetermined length, whereupon the interruption ceases and heating of the wire resumes normal operation.
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 August 20, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 20, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 20, 2025.
- 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.