Electrical heater with a contamination-proof seal
CA 2100016 C · Owner: Schmitz, Randal A. · Inventors: Schmitz, Randal A.; Dopplick, Hugh G.; Steinhauser, Louis P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electrical heater comprising a heating element a tubular, metal sheath surrounding the heating element and spaced therefrom insulation inside the sheath for electrically insulating the heating element from the sheath, and a closure closing one end of the sheath. A passaging extends through the closure in a direction generally lengthwise of the sheath. At least one power lead adapted for connection to a source of electrical energy extends through the passaging for conducting electrical energy to the heating element. The power lead includes an electrical conductor a metallic sleeve surrounding the conductor and insulation for, electrically insulating the conductor from the sleeve. The …
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 July 7, 1993 and granted June 17, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 7, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 7, 2015.
- 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.