Sheathed heater
CA 2114340 C · Owner: Sakaguchi Dennetsu Kabushiki Kaisha · Inventors: Nagano, Shigetoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A sheathed heater comprising at least two core pieces of porcelain insulator separated to each other in the axial direction of said core piece at least two lead pins separated to each other and inserted into the core pieces axially at least, two internal heater coil segments wound around the at leaat two core pieces, respectively and a, cylindrical metal sheath into which the core pieces and the internal heater coil segments are inserted through a thermal and electrical insulation material wherein adjacent ends of adjacent internal heater coil segments are electrically connected to the same lead pin, or lead pins of the same electric potential.
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 January 27, 1994 and granted October 27, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 27, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 27, 2016.
- 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.